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Old 11-24-2009, 05:55 PM
rob king rob king is offline
Motorized Bicycle Newbie
Join Date: Oct 2009
Location: wilmington nc
Posts: 8
Default Re: Past the power curve ?

First let me apologize for my spelling errors. hard enough to get your thoughts across without all the mispelled words! I found a problem that may not be that unusual but caught me. Even after trying rejetting with no noticeable change, I got to thinking about what else could be at falt. New motor and all I new it probably won"t run as well as a well broke in engine, but I knew something was definately wrong. Still surging at cruise speed. Pulled bike into the shop and sat there just reving it a few times when I saw the carb moving! Intake bolts were loose. Funny cause they were tighten with wrench yesterday. Come to find out, factory installed acorn nuts were bottomed out on studs. felt tight but no pressure on intake it was wiggling and allowing intake to leak.any one seen this one before? for such a simple engine, look for the simple problem! got rid of acorn nuts and put regular nuts with lock washers. anyway it runs much better now and i'm sure will run better as it breaks in more. I put original jet back in and will run it like this for awhile .thanks again for all help
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Old 11-24-2009, 06:47 PM
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sportscarpat sportscarpat is offline
Bonneville Bomber the Salt Flat record breaker
Join Date: Jun 2009
Location: california
Posts: 1,632
Default Re: Past the power curve ?

I have seen the bottomed out acorn nut issue and changed mine out as well. I also suffered from high rpm fuel starvation. Drilled out the lower fuel petcock and put in a larger fuel filter. The guy at the lawn mower shop told me to always use the metal screen type filters for gravity feed applications. Paper type filters will not flow enough fuel. Problems solved and I now have plenty of fuel at WOT.
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Old 11-24-2009, 10:20 PM
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spit_fire spit_fire is offline
Motorized Bicycle Elite Member
Join Date: Aug 2009
Location: Brampton
Posts: 207
Default Re: Past the power curve ?

i have a question to all the have rejetted with the almost pubic hair size drill bits, do you do it by hand with a hand drill, dremel, or some sort of drill press?
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Old 11-25-2009, 09:16 AM
Bikeguy Joe Bikeguy Joe is offline
Godfather of Motorized Bicycles
Join Date: Jan 2008
Location: up north now
Posts: 11,531
Default Re: Past the power curve ?

A pin vise drill. (hand drill bit holder- looks like a small screwdriver.)
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