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post #1 of 25 (permalink) Old 02-05-2020 Thread Starter
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Won’t start after carb clean?

My mate bought this kxd 50 second hand but barely ran in, just been in storage. Seemed to work fine at first then after adjusting the idle screw all of a sudden started bogging when asking for power and eventually cutting out. Couldn’t get it back right so we stripped and cleaned the carb and reed. Re assembled, started no problem but soon cut out, then would run for a minute but would die after a few revs before not starting at all.
Anybody have any thing to check for? Pic of bike attached
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post #2 of 25 (permalink) Old 02-05-2020
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Re: Won’t start after carb clean?

Quote:
Originally Posted by Tonck1 View Post
My mate bought this kxd 50 second hand but barely ran in, just been in storage. Seemed to work fine at first then after adjusting the idle screw all of a sudden started bogging when asking for power and eventually cutting out. Couldn’t get it back right so we stripped and cleaned the carb and reed. Re assembled, started no problem but soon cut out, then would run for a minute but would die after a few revs before not starting at all.
Anybody have any thing to check for? Pic of bike attached
That looks exactly like a MT-A1 cag...Id disassemble the petcock and look for sheared-off rubber to be clogging the ultra narrow passageway...

I'd also pull the plug to see if its wet or dry..

Another thing that comes to mind is you bent the float forks and now the float balance is off...…..

Can you post pics of the left hand side of the bike and Ill give you actual engine size identification too...

Best thing to do is get rid of that crappy floater cab and put a pumper carb setup.

Your friend will be glad he changed-up as those floater carbs are very problematic....

https://www.amazon.com/QAZAKY-Carbur...945190&sr=8-37

https://www.amazon.com/Zooma-G-Scoot...YVT736KMS55WSA

Good Luck
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Last edited by CAM2; 02-05-2020 at 05:31 PM.
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post #3 of 25 (permalink) Old 02-05-2020 Thread Starter
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Quote:
Originally Posted by CAM2 View Post
Quote:
Originally Posted by Tonck1 View Post
My mate bought this kxd 50 second hand but barely ran in, just been in storage. Seemed to work fine at first then after adjusting the idle screw all of a sudden started bogging when asking for power and eventually cutting out. Couldn’t get it back right so we stripped and cleaned the carb and reed. Re assembled, started no problem but soon cut out, then would run for a minute but would die after a few revs before not starting at all.
Anybody have any thing to check for? Pic of bike attached
That looks exactly like a MT-A1 cag...Id disassemble the petcock and look for sheared-off rubber to be clogging the ultra narrow passageway...

I'd also pull the plug to see if its wet or dry..

Another thing that comes to mind is you bent the float forks and now the float balance is off...…..

Can you post pics of the left hand side of the bike and Ill give you actual engine size identification too...

Best thing to do is get rid of that crappy floater cab and put a pumper carb setup.

Your friend will be glad he changed-up as those floater carbs are very problematic....

https://www.amazon.com/QAZAKY-Carbur...945190&sr=8-37

https://www.amazon.com/Zooma-G-Scoot...YVT736KMS55WSA

Good Luck
Thanks mate, will get a pic of the other side tmra evening. I have order another fuel tap aswell because he was playing with that before hand and it’s a nightmare to put back together. I’ve ordered an NGK BM6A for it? Didn’t have the time to pull the plug for an inspection. Don’t think I bent the float forks but you never know. Will post a pic tmra anyway, thanks for your help 👍🏻
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post #4 of 25 (permalink) Old 02-05-2020
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It's a CAG! You can do a carb swap if you want or depending on the budget and time you might give it a fresh clean out try and free High fuel flow mod

https://youtu.be/QhjyvTg8seU

https://youtu.be/pwlz_Msn5X4

It's all about the art of modding what you have for free 🙂

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Last edited by MrKitty; 02-05-2020 at 06:17 PM.
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post #5 of 25 (permalink) Old 02-05-2020
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Re: Won’t start after carb clean?

Did you remove the main jet and atomizer and clean them with a small wire or welding tip files. Carb cleaner is not enough, you can file out the main jet bigger too. I bought a small gauge drill set, that came with holder for $8. You can also buy a 5 main jet set for around $10. In my 47cc Cag and 49cc Cags in the stock 13mm piston I run ,70mm main jet. They come w/a ,64 stock the kit has ,66mm, .68mm, .70mm & ,72mm, ,75mm. I have modified some carbs bore to 14mm, and 2 Booste306 14mm Swirl Bored carbs that work very good. The white turn off knob you remove fill the hole w/ JB weld, then drill a bigger hole all the way down and out the bottom. Then put a fuel shut off valve just above it. A V-stack and hp filter will help too.
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post #6 of 25 (permalink) Old 02-05-2020
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Yes defentley check the jet with a flash light it's just a pin hole you can use a bristle off a brush or a strand out of a piece of copper wire to clean the jet after letting it soak overnight in a glass jar of carburetor cleaner

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post #7 of 25 (permalink) Old 02-05-2020
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Re: Won’t start after carb clean?

When ever you have a piston carb and float bowl and its been sitting, you remove it or the bowl and clean it and remove the jet and holder. Most people don't drain the carb when storing, a year later there is all kinds of crap dried in the bottom and white powered alum too, When you fill the bowl it starts and runs till the stuff mixes with gas and clogs your jet.
My X18 came with a 19mm carb, I put a 25mm dirt bike carb, it sat a year, I ran it, till it clogged and then clean everything, I had to remove the bowl a second time and redo the jets again. Now it runs right.

Last edited by EPR; 02-06-2020 at 01:25 PM.
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post #8 of 25 (permalink) Old 02-05-2020
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Re: Won’t start after carb clean?

Quote:
Originally Posted by Tonck1 View Post
Thanks mate, will get a pic of the other side tmra evening. I have order another fuel tap aswell because he was playing with that before hand and it’s a nightmare to put back together. I’ve ordered an NGK BM6A for it? Didn’t have the time to pull the plug for an inspection. Don’t think I bent the float forks but you never know. Will post a pic tmra anyway, thanks for your help 👍🏻

You don't have to buy another fuel tap for the carb itself...

Just do the petcock mod...

You gut the petcock,fill the void with JBWeld then after the JB cures you drill the petcock straight through using a 3/16" or 5/32" drillbit then you get an in-line fuel petcock from the local mower shop and put it between the tank and the carb...




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post #9 of 25 (permalink) Old 02-05-2020
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Re: Won’t start after carb clean?

Theres also ways to modify the rest of the carb....

Seeings the carb bowl is so thick I Dremel it out with my carbide barrelcutter to increase fuel volume..

I sand down the float to lighten it up

I also ovalize and taperport the stock carb....

I also enlarge the mainjet to like a 72..

The differences are like night and day but when you replace it with a pumper carb its like 19th and 20th century...LOL





Last edited by CAM2; 02-05-2020 at 09:30 PM.
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Thats the coolest thing about that engine every part can be modified with a Dremel and some basic hand tools

It's low part count makes it easy to learn and all the parts are very inexpensive and as of right now still very abundant
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Last edited by MrKitty; 02-06-2020 at 12:33 AM.
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post #11 of 25 (permalink) Old 02-06-2020 Thread Starter
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Thanks for all of the reply’s. I do indeed have a carb wire brush cleaning set and ran the through the main jet as well as spraying carb cleaner through. Will probably just have to dismantle and try again.
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Re: Won’t start after carb clean?

Quote:
Originally Posted by Tonck1 View Post
Thanks for all of the reply’s. I do indeed have a carb wire brush cleaning set and ran the through the main jet as well as spraying carb cleaner through. Will probably just have to dismantle and try again.
Did you pull the sparkplug again to see if its wet or dry?

That will be the indication of which problem to face and tackle..

I use a mig welding tip cleaning tool to clean also modify my jets.....$6 bux Home Depot

I would look into the float forks as like I stated are the easiest things to bend..

You could've installed the float upside down too.....

The rounded part with the extra bump goes towards the bottom of the floatbowl...



I also sand the casting slag off the float with 2000 grit sandpaper then I polish it on my polishing wheel..



Another thing to check is the fuel inlet area aswell as the brass seat as it could be clogged with sheared petcock rubber too

I enlarge the carb inlet area to the new size of the petcock up to the brass seat and I open up the brass seat a tiny bit more than what it is to strengthen fuel flow so the bowl doesn't run dry at WOT....



I also polish the mainjet tube too so the float glides up n down without experiencing stiction...



I tried finding clear pics of the floatbowl I grinded out over 3 grams of metarial from but believe me when I say the extra fuel capacity makes a huge difference even at idle...

All these lil things add up to make a huge difference for the better.....


Good Luck

Last edited by CAM2; 02-06-2020 at 11:53 AM.
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Don't forget about those SkullCam videos he shows everything all laid out with mass good tips and tricks...

Faster then a speeding E Revo
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Re: Won’t start after carb clean?

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Don't forget about those SkullCam videos he shows everything all laid out with mass good tips and tricks...
Forget about who?....Who's skullcam????How long has he been modifying pocketbikes??

I can 100% guarantee that guy most likely got all his tips n tricks from gleaning this site....

Lots of those youtube jokers do trying to make $$...…………..LOL

Last edited by CAM2; 02-06-2020 at 12:10 PM.
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Skullcam (he is a member here) he is legit he's a real pocket biker that has a passion for pocket bikes I do know some of his mods came from this site either directly or indirectly I don't have that information and some of the mods are his own or probably mods that he's heard from around town they are mostly mods you can do for free or very little money.

He has a series where he takes all of the good parts off all of his CAGs and makes one good one then takes it to track and videoed himself riding it with other pocket bikers.

I like his videos he goes through a lot of stuff for people that may not know a lot about pocket bikes in kind of a fun artistic way. None of his videos are monetized...

He's definitely not like that other Joker that welded a concrete saw to the side of a pocket bike then called it the world's fastest pocket bike then he painted it Pokemon theme.

Or that circus act where that guy says he's going to build the world's most powerful pocket bike engine then proceeds to buy a bunch of junk parts off of eBay and slaps it together after me repeatedly messaging him telling him that it's not going to work he then proceeded to bolt his sloper to a milk crate to break it in and you can hear the Piston slapping the top of the cylinder and then he disappeared from YouTube ...

Hummm guess that guy forgot to read the threads that you wrote about how to do a proper squish test LOL.

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post #16 of 25 (permalink) Old 02-07-2020 Thread Starter
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Yeah I swapped the float round last night, I had it in the right way in the first place. Will swap it back tonight. Seems to run okay now anyway. Also seen some of skullcam a vids. They are good!
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I live in apartments in CDA if you must know with two kids my girlfriend and a cat.

The gun video was a joke video for a spectra 80 glock lower contest put on by The Unknown Cat himself everyone made a joke video (per his request) and turned them in everyone voted on them and unfortunately I got second place.

Just so you know this site normally has about 2 to 14 members online and about 400 to 500 lurkers with those numbers how whould this site pay for itself off add revenue with members onley I guess they can charge a fee or something.

I'm glad he got the bike going anyway sounds like the info he got from you (Cam2) and the Skullcam video helped him out.

Maybe you should make some vids the only vids I have seen of you working on stuff was the handle bar / brake switches vid.

I'm out I'm going to feed my cat then I have a few offices to go to then the bank then I'm going to stop by my mom's check on her maybe grab a pocket bike engine to work on then I'm going to my friends he got a part to lower his supper moto 1 inch where going to play with that then I'll be home

Faster then a speeding E Revo

Last edited by MrKitty; 1 Week Ago at 10:05 PM.
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Re: Won’t start after carb clean?

There is no one I know that knows more about hp engines than CAM2. When you build an 8 sec, IHRA GMC drag car, then I might listen too you. Remember you begged CAM2 to help you be a Mod and made promises you did not keep, bad move on your part. He also gave you all the info to build your stuff. He should be the Mod, not a criminal.
Most of what I learned is from CAM, he even fix my billet case engine for free. Dude has help thousands of people. and I have a college diesel cert, and still so much to learn.
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Re: Won’t start after carb clean?

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But MrKitty is the reason my electric dirtbike it up and running today! I'm not understanding what he did wrong (On this forum!!) I'm practically finished with my bike, (just a few little quirks left ((such as the soft start issue))) and now he's been offline for 3 days, and probably never coming back 😞
Probably not...

Theres others on other forums with similar problems who really have e-bikes are the reason why your bike is running.....LOL


Ive had razors and honda mini motos too...………...After I kill them I make them gas powered...
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Last edited by CAM2; 02-11-2020 at 10:41 PM.
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I understand what your saying... and I meant that he had been with me through the entire progress of my project, helping me the entire way...

And now that he is gone the MX650 Mods thread is dead...
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