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» Welcome to Pocket Bike Racing

exhaust mods

Posted in Pocket Bikes Performance Tips

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Old 06-04-2010, 08:51 AM
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exhaust mods

hey guyz ive got a stock cag and been told if you cut the muffler of and just weld a straight pipe where the mufflerwas youll get mor mid and top rangespeed/power and will run better is this true need help
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Old 06-04-2010, 11:17 AM
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Exclamation

Yes, cut the resonator off, thats at the end of the exhaust system under the seat. Run straight pipe instead, electrical conduit works great. Dont go big, stay same diameter as outlet now or as close as possible. Cut chamber out as well. Really increase performance. Gains all through the rpm range. Cut both welds (CHAMBER SIDE). The pipe sticks into chamber and you need tocut to BUTT weld pipes to chamber.

THIS AND CARB BORE TO 14MM ARE THE 2 MOST IMPORTANT MODS YOU CAN DO TO A CHINESE CAG!
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Old 06-04-2010, 11:50 AM
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ok cheers ive bored out my carb to about 17mm goes good so should i cut the chamber out and weld a stragiht pipe through ?? what do you mean about the chamber part, i no what you mean about the muffler
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Old 06-04-2010, 03:20 PM
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its all good ive done it all, and has made a massive difference runs great
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Old 10-04-2010, 11:03 AM
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DO not run pipe through the chamber! The chamber is there for POWER in a 2 stroke. 17MM? You did this and it idles? I thought 15mm was the border line on a chinese cag. I once bored the carb to 5/8`s. It had zero throttle,,,just ran WOT constant.
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Old 10-04-2010, 08:53 PM
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Quote:
Originally Posted by HOSS View Post
I once bored the carb to 5/8`s. It had zero throttle,,,just ran WOT constant.
Man, you probably just had leaky cases or manifold. I've SEEN cag carbs over here bored out to 11/16's.(17mm)

All of them seemed to run fine. You might just have had a dud one <trust me, i've had a few.>

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Old 10-04-2010, 11:22 PM
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Talking

No, it was open on both sides of the slide. This was a 47 (really 39cc) cag bike.
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Old 29-06-2010, 12:04 AM
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would anyone have a pic of this modded exhaust with muffler cut out, i wouldnt mind making one so i can have a spare laying around
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Old 29-06-2010, 02:25 PM
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anyone have a picture of this ??????????????????????
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