40cc 4 stroke pocket bike - Pocket Bike Forum - Mini Bikes
 
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post #1 of 4 (permalink) Old 05-03-2019 Thread Starter
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I'm just curious, has anybody owned any of these brand new bone stock? I'm really curious on the top speed. I know there are adjustable, I've had a couple of these and 18 miles an hour was all I could hit. I know these are the Chinese Honda clone four strokes. Just looking for some real specs from someone who has owned these. Thanks
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post #2 of 4 (permalink) Old 05-04-2019
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Re: 40cc 4 stroke pocket bike

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Originally Posted by silverbullitt7 View Post
I'm just curious, has anybody owned any of these brand new bone stock? I'm really curious on the top speed. I know there are adjustable, I've had a couple of these and 18 miles an hour was all I could hit. I know these are the Chinese Honda clone four strokes. Just looking for some real specs from someone who has owned these. Thanks
18mph is about right..They max out at 20mph..Theyre pretty restricted and are built for powertools so theyre quite deficient under load of a rider...

Wanna hit 20 try putting a lil trans fluid in the gas..it'll cool the intake valve and lubricate the topend plus will boost the compression by increasing ring seal alil giving the engine a lil extra punch

Theres mods to make them faster like uncork the exhaust by fabricating a headder put a 15mm carb in place of the 10mm carb or putting a carb from a Z50 Honda minitrail on it,ignition advance key,regrinding the camlobe,opening the intake / exhaust port hole,increasing the compression to 10.5 -11:1 ,lapping also readjusting the valves and tuning it in...

Good Luck

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Last edited by CAM2; 05-04-2019 at 12:51 AM.
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post #3 of 4 (permalink) Old 07-03-2019
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Re: 40cc 4 stroke pocket bike

i have one of these if you need to know, im about 200 to 220 on this thing and i think about 18 to 25 moh would be a fair to say.
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post #4 of 4 (permalink) Old 07-04-2019
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draining out the factory oil and replacing it with good oil is the single most important thing on the 40cc 4 strokes

when you undo the drain plug onley half of the oil will come out to get it all out you need to blow air into the crank case where you fill it with a peace of vinyl tubing and your mouth. dont use a air compresser or it will blow out the seals.

i put 10w 30 synthetic in my neighbors the performance increase is noticeable
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Last edited by MrKitty; 07-04-2019 at 04:09 AM.
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