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Old 06-05-2013, 07:13 PM
Scootmeister Scootmeister is offline
Motorized Bicycle Elite Member
Join Date: Mar 2011
Location: North Carolina
Posts: 243
Default Re: Biturbo Exhaust/Chain Adjuster upgrades

Here are photos of the final product. I used a B & S muffler and a piece of 57mm pipe to make a low resistence silencer that I pop riveted on the Biturbo. I noticed a significant boost in power, much quicker response and higher RPMs. I'll be tweaking the air/fuel ratio which is easy on this 16mm Walbro carb. All it takes is a twist on the high speed adjustment. A couple of plug chops should do it. BTW, the sound is great, not too loud but deep and rich, without the ringy dingy ping you get from some 2 strokes. One downfall is the extra torque blitzed first gear in my Shimano Nexus hub which has been flawless for 3 years of riding.
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