Pocketbike Forum banner

1 - 15 of 15 Posts

·
Registered
Joined
·
29 Posts
Discussion Starter · #1 ·
Hi, I'm new to this forum I got my first pocket bike about a month ago its a 49CC 2010-05 KXD PB008A Pocket Bike. You can see a picture of it here: http://www.jlmbike.com/chanpin/show.asp?i=97.

I have a few questions, I got a few mods lined up.

1. I'm going to be adding reeds. I was wondering which material would be best? I bought some Carbon reeds although would Fibre Glass reeds be better? The best way to do this I read on the forum and cheapest would be to follow the Cheap Reed Mod for Cag! guide. Is there a difference between the triple stage and just adding the Carbon/Fibre without the triple stage?

2. Air filters I've been looking at some although I can't tell which ones would be higher performance ones? How can I tell the difference also would a "bigger" air filter in size make any difference?

3. I believe I got a 6 tooth housing sprocket clutch bell stock. With a rear sprocket of 72 teeth. So 6/72. I bought a 7 tooth housing sprocket would this improve my performance also is my rear sprocket ideal?

Sorry for these long questions I'm sure they have been answered a hundred times if you could kindly redirect me to the topics if they have I'd really appreciate that.
 

·
Banned
Joined
·
21,742 Posts
Welcome to the site.....Your bike is really a Mt-A2 full fairing cag...It could be either 43 or 49cc..Parts fall under the 39cc/47cc category...I had that same model frame...I didnt feel too safe on it so I remodeled mine into a trellis design........

Your bike should be geared 6/68...you could go 7/68 no problem...On one of my wickedly modded cags Im running 7/55 and on another 5 port cag 6/47...My 2011 trophy cag Im running 7/60

For an airfilter Im pretty partial to the 3" Foam Uni

If your engine is stock composite reeds will work...For steeper mods youre gonna need stiffer reeds.........triple stage reeds are ok......Those who use them say they work pretty good....On some of my bikes Im running the ADA 4 petal reedbox and its working pretty good so far.......Good Luck
 

·
Registered
Joined
·
29 Posts
Discussion Starter · #3 · (Edited)
Thanks, what does cag stand for?

For my first pocket bike I guess you could say I'm fairly satisfied with it for the price :). The frame seems durable. Although I've been thinking about buying a different seat/petrol tank frame.

Kk, thanks for the advice I'm going to order a 68 sprocket for the rear then :). What do you mean by 3" Foam Uni air filter? Could you possibly post a picture if that isn't asking too much?

I was thinking of this: http://www.ebay.co.uk/itm/47cc-49cc...et_Bikes_LE&hash=item58960f58b4#ht_971wt_1271. Although it seems like a stock one? :S

Yeah my whole bike is stock got it brand new. What would composite reeds be? :S Google'd it but found nothing. So the stiffer the reeds the better? Lets say I was to add 1 carbon and 1 fibre glass reed triple stage method would that be stupid or stiff enough?

Also the manufacturer says that the tank is for 0.6L although I've been able to fit 4L+ :S...Another thing should I stick to the manufacturers guideline on the fuel to oil ratio after break-in period? Cause the seller told me that I should use a different fuel to oil ratio compared to the manufacturer :S.

Also any clue what kind of spark plugs I would use for it?
(I'm asking all these questions now and stocking up on the equipment I need because I got this bike in another country (Czech Rep.) I live in the UK, although I have it at my relatives there, as its no use in a built up city really.)
 

·
Banned
Joined
·
21,742 Posts
Thanks, what does cag stand for?

For my first pocket bike I guess you could say I'm fairly satisfied with it for the price :). The frame seems durable. Although I've been thinking about buying a different seat/petrol tank frame.

Kk, thanks for the advice I'm going to order a 68 sprocket for the rear then :). What do you mean by 3" Foam Uni air filter? Could you possibly post a picture if that isn't asking too much?

I was thinking of this: http://www.ebay.co.uk/itm/47cc-49cc...et_Bikes_LE&hash=item58960f58b4#ht_971wt_1271. Although it seems like a stock one? :S

Yeah my whole bike is stock got it brand new. What would composite reeds be? :S Google'd it but found nothing. So the stiffer the reeds the better? Lets say I was to add 1 carbon and 1 fibre glass reed triple stage method would that be stupid or stiff enough?

Also the manufacturer says that the tank is for 0.6L although I've been able to fit 4L+ :S...Another thing should I stick to the manufacturers guideline on the fuel to oil ratio after break-in period? Cause the seller told me that I should use a different fuel to oil ratio compared to the manufacturer :S.

Also any clue what kind of spark plugs I would use for it?
(I'm asking all these questions now and stocking up on the equipment I need because I got this bike in another country (Czech Rep.) I live in the UK, although I have it at my relatives there, as its no use in a built up city really.)
Google sux most of the time..We have a search box for info here at PBP

http://www.ebay.co.uk/itm/UNI-POD-3...rcycles_Parts_Accessories&hash=item45fbc6cf62

http://www.ebay.co.uk/sch/i.html?_sacat=0&_from=R40&_kw=pocketbike+reeds

http://www.ebay.co.uk/itm/NGK-SPARK...arts_Vehicles_CarParts_SM&hash=item4848013951

i break my engines in at 32:1 ratio..I heatcycle the engine to operating temps 5-6 times before even trying to ride it...these engines are built way too tight and too much friction...

after a gentle riding break-in of 3-4 tankfuls you then mix the fuel to 42:1 and then you can rip on it......Not following a generous and gentle break-in the engine will be damaged and starting a life of deep demise and never produce real power......These crappy engines need alot of TLC in the beginning to live a long healthy life as long as the fuel is mixed good...

Id get rid of the crappy floater carb and go with a walbro hp pumper carb retrofit kit......Youll get a better useage out of your bike aswell as be able to keep it in tune easier.....Good Luck

http://www.bigmotorsport.com/products/Mini-Pocket-Bike-33-43-49cc-HP-Carburetor-Kit.html
 

·
Registered
Joined
·
29 Posts
Discussion Starter · #6 · (Edited)
Thanks for all the information & links guys appreciate it.

I've probably had 3 tanks full already. Although I went full throttle a few times :/, I didn't know this at the time. I definitely went over half-throttle couple times. Although it didn't seem to affect it as such.

Once I get back to it I will dismantle it all and have a look, would there be any specific signs if there's engine damage? Also as I didn't do the break-in runs as properly should I repeat with another lets say 2 full tanks i.e. break-in period?

Regarding those reeds u showed me on eBay: http://www.ebay.co.uk/sch/i.html?_s...ketbike+reeds&clk_rvr_id=391547839543&afsrc=1. Shouldn't the carbon be cut like this? http://www.ebay.co.uk/itm/140594190...X:IT&_trksid=p3984.m1497.l2649#ht_1010wt_1271

I'll be honest and I don't want to spend another £7.99 at the moment I ordered: http://www.ebay.co.uk/itm/140485977...X:IT&_trksid=p3984.m1497.l2648#ht_1010wt_1271 & http://www.ebay.co.uk/itm/140594190...X:IT&_trksid=p3984.m1497.l2649#ht_1010wt_1271. I got them delivered both today. Are they sufficient or should I order this reed http://www.ebay.co.uk/itm/Mini-Moto...t_Bikes_LE&hash=item2c680a7cfd#ht_3740wt_1271 (One that has no cut middle).
 

·
Banned
Joined
·
21,742 Posts
Thanks for all the information & links guys appreciate it.

I've probably had 3 tanks full already. Although I went full throttle a few times :/, I didn't know this at the time. I definitely went over half-throttle couple times. Although it didn't seem to affect it as such.

Once I get back to it I will dismantle it all and have a look, would there be any specific signs if there's engine damage? Also as I didn't do the break-in runs as properly should I repeat with another lets say 2 full tanks i.e. break-in period?

Regarding those reeds u showed me on eBay: http://www.ebay.co.uk/sch/i.html?_s...ketbike+reeds&clk_rvr_id=391547839543&afsrc=1. Shouldn't the carbon be cut like this? http://www.ebay.co.uk/itm/140594190...X:IT&_trksid=p3984.m1497.l2649#ht_1010wt_1271

I'll be honest and I don't want to spend another £7.99 at the moment I ordered: http://www.ebay.co.uk/itm/140485977...X:IT&_trksid=p3984.m1497.l2648#ht_1010wt_1271 & http://www.ebay.co.uk/itm/140594190...X:IT&_trksid=p3984.m1497.l2649#ht_1010wt_1271. I got them delivered both today. Are they sufficient or should I order this reed http://www.ebay.co.uk/itm/Mini-Moto...t_Bikes_LE&hash=item2c680a7cfd#ht_3740wt_1271 (One that has no cut middle).
Yeah the signs are scratched up piston and cylinder,,blued piston pin and bearing
 

·
Registered
Joined
·
29 Posts
Discussion Starter · #9 ·
If I was to dismantle the engine, every single bit, and then put it back together, would this require another break-in?
 

·
Banned
Joined
·
21,742 Posts
Would you advise buying a new piston + cylinder just in-case?
You can see what the cylinder looks like through the exhaust port with a flashlight mainly without any more disassembly than removing the exhaust pipe.....

If youre gonna totally disassemble it I would take the time to do a few power mods to make it more powerful............Most of the work involves a dremel and a lil time.................
 

·
Registered
Joined
·
29 Posts
Discussion Starter · #11 ·
Hmm, I can't check it right now as its like 800miles away :p.

But yeah I'm planning to disassemble it all and see how everything is, then adding mods that I'm going to purchase soon.

Lets say I was to clean everything as well thoroughly would this require another break-in?

Also about the carb you mentioned above which one would you suggest?

1. http://www.funbikes.co.uk/Mini_Moto_Carburetor_Upgrade_Kit_15mm(313).aspx
2. http://www.funbikes.co.uk/Mini_Moto_Carburetor_Upgrade_Kit_19mm(2203).aspx

Any clue which would fit my bike the 15mm or 19mm? :S

Thanks.
 

·
Banned
Joined
·
21,742 Posts
Hmm, I can't check it right now as its like 800miles away :p.

But yeah I'm planning to disassemble it all and see how everything is, then adding mods that I'm going to purchase soon.

Lets say I was to clean everything as well thoroughly would this require another break-in?

Also about the carb you mentioned above which one would you suggest?

1. http://www.funbikes.co.uk/Mini_Moto_Carburetor_Upgrade_Kit_15mm(313).aspx
2. http://www.funbikes.co.uk/Mini_Moto_Carburetor_Upgrade_Kit_19mm(2203).aspx

Any clue which would fit my bike the 15mm or 19mm? :S

Thanks.
If the engines already broken-in and youre not adding a new piston and ring you dont need to re-break it in...if you do change them then a 2 tank break-in is required....

both carbs will fit but the 19mm is overkill...Ive used both and would never use them on a cag again.........Its two needle adjustable pumper carbs for me...Id get a jet kit for that 15mm carb.....Youll be rejetting and retuning every 10 degrees of ambient air temp change which youll be doing more fiddling and less riding...............
 

·
Registered
Joined
·
263 Posts
I wouldn't tear it apart. Do what you want though.

It was tested at the factory so it already had a heat cycle. you said you were taking it easy. I'd put some hours on the top end before replacing if it was damaged
 

·
Registered
Joined
·
29 Posts
Discussion Starter · #14 ·
Hmm well I would need to take it apart for the modifications I want to do anyway.

What do you mean by put some hours on the top end? Drive it for a good period of time?
 

·
Banned
Joined
·
21,742 Posts
Hmm well I would need to take it apart for the modifications I want to do anyway.

What do you mean by put some hours on the top end? Drive it for a good period of time?
Im sure he means to break it in and ride it first before doing any mods...if Im not mistaken you already stated it has some time on it already........I mod them both ways seeings I super polish the inside internals to combat friction anyway the new unfired engine wouldnt fair no less but maybe actually more because the chinese just slap these engines together so you may be up to seeing lightly scratched piston sidewalls that cant be polished out without creating enough clearance to introduce a highly defined piston knocking in the cylinder bore as it runs............It doesnt take much either.....
 
1 - 15 of 15 Posts
Top