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Old 05-20-2011, 09:20 PM
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mapbike mapbike is offline
Motorized Bicycle Elite Member
Join Date: Mar 2010
Location: Central Texas
Posts: 5,379
Default Re: what did you do to your motor bike today?

I put another exhaust on the white bike yesterday ( Dont pay any attention to the zip tie holding the canister at rear, that was just a quick way to hold it in place while I tested to see if it was going to work the way I wanted it too) and reduced the jet size in the carb one size, I have 80 miles on that engine now and it was time to stop all that 4 stroking it had even at WOT, it would only hit 30 mph with that expansion chamber on it and now that I took it off and went with a port matched home built exhaust flange and a length of 1" flex pipe dumping into a rear ( Energy Drink Can ) chamber at the rear it will hit 38 MPH and cruise nice at 30-32 MPH now, I know 38 MPH aint much to some on here but this engine is bone stock, no polished ports, nothing deburred and cleaned up, just a tuned carb and an opened up free flowing exhaust and gained 8 MPH and it just has 80 miles on it so it isnt even good and broke in yet, I will be putting my other shaved slant head on it in a couple days to raise compression and this will be all I do to this engine until I get a hundred or so more miles on it, then I plan to scribe the piston at TDC around the intake port and resize the skirt to flow the air/fuel in better and then do some deburring, polishing, and port matching, this should bring this engine to life or at least I hope it does and should since it's such a good runner already.

Attached Images
File Type: jpg White bike new exhaust3.jpg (101.3 KB, 45 views)
File Type: jpg White bike new exhaust1.jpg (117.8 KB, 41 views)
I dont always ride WOT, but when I do..I do my best to keep the rubber side down..Ride safely my friends!
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