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Old 01-23-2010, 08:13 AM
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Motorized Bicycle Elite Member
Join Date: Dec 2009
Location: Maine
Posts: 489
Default Re: sbp expansion chamber?

All you have to do to tune it is first have the motor running well BEFORE you put the pipe on, install pipe, warm it up with a short run, do a full throttle run for approx. 1/4 mile, hit kill switch @ full throttle, let cool, read plug.(this checks the Carb. rich/lean) adjust "C" clip as needed, repeat as needed, (sounds simple and quick, not always) if your close with the carb, you will feel a big difference, since your running a 49cc, they usually rev a bit higher, you may want to shorten, instructions come with the pipe or are on SBP web site.
The weight is just right, not to heavy but durable, I welded a bracket on mine with a MIG welder, no burn thru issues, just don't fall asleep while your welding on it or get a shop to do it.
Hope that helps
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