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Pit Bike

11K views 104 replies 6 participants last post by  EPR 
#1 ·
Hello all, can anyone tell me what kind of bike this is. Pics attached. I need to get a chain and brake cables for it. It reads it’s a Honda under the seat but I can’t find anything on line that looks like this.Thanks Auto part
 

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#3 · (Edited)
wow thats new 🙂 its a china pit bike with a cag engine without a transmishon I bet you can use standard mountain bike cables for that thing... look up 47cc engine on ebay for engine parts. ( that bike used to have the Piston ported engine or the 4 stroke on it you can see how somebody made a mount for The cag engine) the seat is the onley thing honda about it 🙂
 
#4 · (Edited)
Don't think that is the original engine either. You need a 3 to 1 reduction trans over the clutch it moves your front engine sprocket 6 or 7" back so when your swing arm moves up and down the chain don't drag on the front of the swingarm where it's mounted.
I love the frame though, the swing arm looks alum, is the frame alum also. Or, was it a 50cc four stroke engine? See photo of the trans type you need, there are different lengths trans. See photo.
You need a better exhaust than that can. tuned exhaust, and I would modify the stock carb and re-jet it to .70mm main jet, a V stack will help also.
 

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#7 ·
the swing arm is aluminum the rest of the bike is steal. looks like a coolster to me... the 125cc probley broke and the guy had a 47cc CAG engine laying around and mounted it up not thinking to mutch about the chain line or the gearing...

your going to need a transmishon
https://www.monsterscooterparts.com...8g8zT1sBE-eCDbpcZWgDfheBhiGPYtxBoCfXIQAvD_BwE then you can figure out if the engine is in a good spot if its not you will have to re mount it
 
#8 ·
That trans will probably work, but it has an 8mm sprocket, for T8F chain. There are also #25 chain sprockets for that trans. First you need to fined what your rear sprocket is, or chain. They sell them with a #25 sprocket too, or you can order one online.
 
#16 · (Edited)
Like EPR said its #25...…..By the looks of the size of the rear sprocket which looks between 80-90tth it looks like it will top out at around 9-10mph full throttled so you may be right by that question/statement about actually needing the brakes...LOL………

It'll definitely be a very torquey bazterd with a gear ratio of around 15:1………..

To get it to 10:1 ratio to get speeds closer to 15-25mph you'll need a 10 or 9tth pinion...…….
 
#15 · (Edited)
It looks like #25 sprocket, if your chain is real long you can add a spring loaded chain tensioner, to keep tension on the chain as the swingarm goes up and down. I would look for 10Ft, 3 meters or so, of #25H chain and a #25 master link or two. They have gold colored chains and masters too.
 
#17 · (Edited)
I was looking at that rear gear also. I was also thinking about 10 to 1 ratio. You can change to a smaller rear gear also. I would search around for a 3rd bearing clutch housing w/ bigger pinion, I found one that came w/ an 8 tooth here. You can buy 9 and 10 tooth online, but there are many different types, have to make sure it fits you bell and threads.
Would love to mount this billet alum highly modified Cag reed port engine, that CAM2 worked his Magic on, lol. We call it " The Beast ", lol.
 

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#20 · (Edited)



Get a 15mm WYK192 pumper carb setup from ebay for $20-25.00...…….

Heres a link

https://www.ebay.com/itm/Racing-Car...824122?hash=item2613da327a:g:f4sAAOSw0yVcZF~y

Youre also gonna need a pumper carb fuelline kit for it too...…..


https://www.ebay.com/itm/49cc-49cc-...280678?hash=item3aa67c81a6:g:9UMAAOSwrklVHGPv

Seeings it says the bike is EPA aswell as California Compliant so that means the thing is riddled with restrictors..You already know the carb is one. Another will be a restriction inside the expansion chamber for the exhaust....

The engines they put on them are tool based engines fitted on Augers,trashpumps and brushcutters..Theyre roughly 2hp too...







Good Luck and welcome to the forum......
 
#22 · (Edited)
Did you use premium ethanol free fuel and a non synthetic two stroke oil mixed at 35:1 for break in.

check the fuel line and make sure the factory put a fuel filter on there if you don't have a fuel filter it may have sucked in some plastic out of the new gas tank.

Check the fuel shut off petcock on the carburetor make sure that the shut off is pointing up and down

here is how to clean the stock carby
https://youtu.be/QhjyvTg8seU

your wasteing your time with that carb you got off Amazon just send it back unopend and get your money back its just going to come loose and make an air leak and cause engine damage or the casting will just crack and it will fall off they are junk I don't care what anybody says I've never seen members have any good luck with those carbys and I've had the same experience as everybody else without the jet kit and slide kits you can't even tune the carburetor and just when you get at working and kind of okay it will crack and fall off...

Keep in mind that pitbike that you have is using pocket bike technology they are about 80% working on and 20% play so plan on lots of father son time out in the shop...

check every bolt and locktight blue is your friend before rideing
 
#24 ·
Did you use premium ethanol free fuel and a non synthetic two stroke oil mixed at 35:1 for break in.

check the fuel line and make sure the factory put a fuel filter on there if you don't have a fuel filter it may have sucked in some plastic out of the new gas tank.

Check the fuel shut off petcock on the carburetor make sure that the shut off is pointing up and down

here is how to clean the stock carby
https://youtu.be/QhjyvTg8seU

your wasteing your time with that carb you got off Amazon just send it back unopend and get your money back its just going to come loose and make an air leak and cause engine damage or the casting will just crack and it will fall off they are junk I don't care what anybody says I've never seen members have any good luck with those carbys and I've had the same experience as everybody else without the jet kit and slide kits you can't even tune the carburetor and just when you get at working and kind of okay it will crack and fall off...

Keep in mind that pitbike that you have is using pocket bike technology they are about 80% working on and 20% play so plan on lots of father son time out in the shop...

check every bolt and locktight blue is your friend before rideing

To be honest, defintely did not do a proper break in. I just mixed up some 87 octane with 2-stroke oil to 25:1 and poured it in the tank. Well the carb is relatively cheap and it's already on the way so I guess Ill just return it when it gets in from Amazon.



The platform I bought: DR-X 50cc - is it a platform worth building on? In other words, is it worth it to put some money into the motor (big bore?), etc or am I better off just getting a better brand for my son? I like to tinker with stuff but I dont want to get in over my head if its not the right chassis to build off of. Thanks
 
#26 · (Edited)
you have the EZ pull starter the starter you orderd is not going to work you need this one

https://www.ebay.com/itm/Alloy-Pull...679806&hash=item288b28526d:g:mKUAAOSwbqpT3XvZ

they can be made somewhat reliable but as a general rull never ride one farther then your willing to walk or tow (keep tools on you to remove the chain incase the transmishon locks up)they make good pit bikes or around the home/farm they are completely worthless for rideing in the woods...

there is no big boar kit for that engine it has the 44mm piston already

its a weed wacker engine with a very low part count just about every part can be modified with a dremmal tool no need to fall victim to the hop up parts scam.
 

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#29 · (Edited)
you have the EZ pull starter the starter you orderd is not going to work you need this one

https://www.ebay.com/itm/Alloy-Pull...679806&hash=item288b28526d:g:mKUAAOSwbqpT3XvZ

they can be made somewhat reliable but as a general rull never ride one farther then your willing to walk or tow (keep tools on you to remove the chain incase the transmishon locks up)they make good pit bikes or around the home/farm they are completely worthless for rideing in the woods...

there is no big boar kit for that engine it has the 44mm piston already

its a weed wacker engine with a very low part count just about every part can be modified with a dremmal tool no need to fall victim to the hop up parts scam.
Dude, never order anything with out asking here first, its so easy to order the wrong stuff. Might as well use the 14/14 Dell carb, and with that alum intake you can put a brass barb fitting on the bottom to add a boost bottle. That's the same starter set up on billet alum cased, The Beast Engine. CAM2 fixed all the problems and did so much modifing & blueprinting its hard to list them all, lol. Can't believe you bought a plastic starter housing either, lol. MrKitty has shown you the right one. The newer ones are easier to pull than the old ones, cause they have more leverage. Going to cost more than you paid to send that stuff back. This starter add on is for the old style flywheel.
Like I feared through your description of the current pullstarter state and confirmation through pictures provided you indeed have the crappiest pullstarter the EZ-Starter Pullstarter...The one you referenced is one of the better ones so Id get the right flywheel to go with that better pullstarter and also get a rocket key to advance the timing...….

Heres the flywheel id buy for it...

https://www.amazon.com/TC-Motor-Rec...c+flywheel&qid=1577491794&s=automotive&sr=1-7

Heres the rocket key

https://www.amazon.com/ScooterX-Tim...rocket+key&qid=1577491876&s=automotive&sr=1-2

Very awesome you have atleast introductory experience...better if you've ever had to rejet any of the carbs …..

That bike is indeed a worthy canvas to use as a project to gain overall experience...I always say if you can iron out and make a crappy chnese bike 80% reliable you've gained a huge victory and Ive done it many many times.......LOL

Those ready built hp engines are a crapshoot and need to be totally disassembled and modified to work as really intended to work..

Id say depending on how your son feels about the process n such is how you should play it as some are initially just in it for the fun factor because they spend their entire week in school learning....

Ok thanks guys.



So as far as I am tracking, I need to either run the carb I already ordered:
https://www.amazon.com/gp/product/B07QYTPBVL/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1 ) for now....


Or I need to purchase the better carb which is located here:
https://www.amazon.com/Mx-M-Carbure...ocket+Bike&qid=1577497732&s=automotive&sr=1-1


And also, I need to purchase the fuel line kit:
https://www.amazon.com/Zooma-G-Scoo...R8CZ9DA6Y955MHD4X3&tag=pocketbikeplanetcon-20


And the pull starter I ordered is not going to work and I need to return it. The proper pull starter I need to purchase is located here:
https://www.ebay.com/itm/Alloy-Pull...679806&hash=item288b28526d:g:mKUAAOSwbqpT3XvZ (is a good pull starter available on Amazon instead of ebay?)


And I also need to purchase this flywheel:
https://www.amazon.com/TC-Motor-Rec...=automotive&sr=1-7&tag=pocketbikeplanetcon-20


And this rocket key:
https://www.amazon.com/ScooterX-Tim...=automotive&sr=1-2&tag=pocketbikeplanetcon-20


So I get these parts and I should be good to go? Id like to see if I can find that alloy pull starter on Amazon instead of Ebay. Cant beat the easy returns on Amazon LOL.


So Carb, Flywheel, Pull Starter, Rocket Key and Fuel Line Kit. I wonder if we'll notice a power bump with these parts? Thanks again. Let me know if I am missing anything here. Im in the Army and it sucks that these parts wont be in by the time I get off of leave, but I guess me and the kiddo will make it a weekend project.
 
#27 ·
Dude, never order anything with out asking here first, its so easy to order the wrong stuff. Might as well use the 14/14 Dell carb, and with that alum intake you can put a brass barb fitting on the bottom to add a boost bottle. That's the same starter set up on billet alum cased, The Beast Engine. CAM2 fixed all the problems and did so much modifing & blueprinting its hard to list them all, lol. Can't believe you bought a plastic starter housing either, lol. MrKitty has shown you the right one. The newer ones are easier to pull than the old ones, cause they have more leverage. Going to cost more than you paid to send that stuff back. This starter add on is for the old style flywheel.
 

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#31 · (Edited)
that lightend flywheel is not a hop up its a down grade

View attachment 150809 BAMM!
Pretty nice but you fotgot to mention how long it took you to do that modification and the tools you used.....Im sure when it comes to dollars n cents versus time and possible injury he will choose either an untouched bone stock one or the one I posted....LOL

For bone stock engine and a 6yr old that lightened 8fin HP flywheel is good at keeping the throttle nice n crispy...That keeps the bike more fun and interesting than predictable and boring...….

Also to mention that a lighter flywheel with lighter fin drag yields higher revs too.....Especially more so when running alky...……….

This flywheel already started out as a much lighter flywheel than yours being built with 16 fins instead of the 18fin yours came with.......



Ive utilized the 12fin design on my engines too as sometimes with certain gearing out of the norm a slightly heavier flywheel with a lil more air flow is needed as load and stresses increase...

Kaboom...…………….LOL

Im sure you remember these pics I took back of the mods when I did them back in like 2010/2011.....LOL



 
#33 · (Edited)
For your list..ditch the Del rep carb and go with the pumper carb with fuelline kit..

This engines got the more expensive HP pumper carb kit..





Out of the box that del rep carb will not even run on your engine....The mainjet inside is jetted for basically anyones guess unless you can size it up and it miraculously works...You will also need a $20 mainjet assortment pack to properly jet it or youll kill the new pullstarter or even your arm yanking the bejesus out of it trying to get it to fire up...

They don't give instructions and theres tricks to get them to seal up and work but its really not worth the time to gain the same headaches youre already experiencing...……..




Youll be better off modifying the stock carb with JB weld and a 5/32" drillbit and adding an inline fuel filter while awaiting on the pumper carb....

As far as the pullstarter if you go with another E-start pullstarter chances are it will fail again but with the pumper carb it will actually start up a lot quicker n easier too..Kind of like a weedwacker for the lawn....


Most don't run too well because theyre set lean with unadjustable carburetors but they start up relatively quick...I break off the restrictors covering the LSN and HSN and properly adjust my weedeaters,backpack blowers etc...screw the govt...they aint paying for my new topends or paying for the time wasted fiddling with engines or wasting my day yanking pullstarters.......


Id go with the better pullstarter you originally posted and replace the flywheel too and while doing that increase bottomend takeoff by putting in a timing advance key aka Rocket key to advance the timing 10* degrees...….

Thanks for your service to our country.....
 
#35 ·
For your list..ditch the Del rep carb and go with the pumper carb with fuelline kit..

This engines got the more expensive HP pumper carb kit..





Out of the box that del rep carb will not even run on your engine....The mainjet inside is jetted for basically anyones guess unless you can size it up and it miraculously works...You will also need a $20 mainjet assortment pack to properly jet it or youll kill the new pullstarter or even your arm yanking the bejesus out of it trying to get it to fire up...

They don't give instructions and theres tricks to get them to seal up and work but its really not worth the time to gain the same headaches youre already experiencing...……..




Youll be better off modifying the stock carb with JB weld and a 5/32" drillbit and adding an inline fuel filter while awaiting on the pumper carb....

As far as the pullstarter if you go with another E-start pullstarter chances are it will fail again but with the pumper carb it will actually start up a lot quicker n easier too..Kind of like a weedwacker for the lawn....


Most don't run too well because theyre set lean with unadjustable carburetors but they start up relatively quick...I break off the restrictors covering the LSN and HSN and properly adjust my weedeaters,backpack blowers etc...screw the govt...they aint paying for my new topends or paying for the time wasted fiddling with engines or wasting my day yanking pullstarters.......


Id go with the better pullstarter you originally posted and replace the flywheel too and while doing that increase bottomend takeoff by putting in a timing advance key aka Rocket key to advance the timing 10* degrees...….

Thanks for your service to our country.....

Ok cool so this is the carb to get, as referenced earlier:
https://www.amazon.com/dp/B0753GVYC3?tag=pocketbikeplanetcon-20


Will this carb work out of the box (with the fuel line kit), or will I need to get a jet assortment pack?


Also just to clarify, this is the correct pull start and flywheel I need to get, right? Sorry I get confused on the EZ start terminology.



https://www.ebay.com/itm/Alloy-Pull...679806&hash=item288b28526d:g:mKUAAOSwbqpT3XvZ


https://www.amazon.com/dp/B01EJ3NZ2S?tag=pocketbikeplanetcon-20


And of course the carb I already ordered on Amazon, along with the starter kit (this one: https://www.amazon.com/gp/product/B00KL9XNAE/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1 ) will be going straight back to Amazon once I get them
 
#34 · (Edited)
Heres the same carb you bought also with the jets I talked about so you can see them...

Theyre the lil round brass pieces....They finetune the fuelflow the engine consumes as it takes the perfect ratio to get optimal results..



The carb you bought doesn't state it coming with an assortment of jets like this carb does...

This is what happens when you overtighten them too..



 
#38 ·
I'd like to Thank You for your service too and to wish you and your son many happy days with that little motorcycle.


It's been my experience with small boys and bikes that it's the clutch that will make the biggest difference. I suspect the stock clutch will start to engage fairly early before the motor's spun up which is a good thing. It'll take off kinda slow and give him a chance to get used to it. Once he's gained some confidence you can start modifying the clutch for a later hit. When he finds out he can spin the back tire on a launch he'll think you're a genius.
 
#39 · (Edited)
I would just keep the stuff you ordered, if you send them back, postage will eat up all your return money and you will have nothing. I would just try that carb, till you get something else better. Did you order the new type starter housing??
There is this pawl upgrade kit w/ big round steel pawl, works like the piston port starter, for the old stock flywheels, comes with matching starter housing, but you have a new type flywheel.
 
#40 · (Edited)
Just checkin here, alot of you have been very helpful. The pull starter came, didn't fit, and so I sent it back to Amazon. The carb came and I just immediately sent it back. I figure I will just do it right the first time and order the right parts. Waiting for my Amazon refund and will go from there. Thanks

I have everything in my cart, ready to go when payday hits!
 

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#45 · (Edited)
You do know that on those ratchet pawl type pullstarters you must pull the pullrope while setting the pullstarter or the fully sprung pawls wont allow the center to pass through...….;- Right?

Its easier to remove the pullstarter part from the aluminum case..set the pullstarter case to the engine using the 3 screws then install the pull mechanism by pressing the ratchet to the pawls then pulling the rope to set it then reinstalling the 3 screws used to attach that.......

The pulling action flicks the pawls to allow the pullstarter to be set in place...

In any event its good that you actually got a better pullstarter………….…….

Good Luck
 
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