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Old 12-31-2013, 09:45 AM
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Join Date: Mar 2010
Location: Central Texas
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Smile Re: what did you do to your motorized bicycle today?

Originally Posted by Greg58 View Post
I have a drill set with a pen type drill handle, the solder and drill method is what I do also. The one thing I have learned is everyone of these engines are different, what works on one may not on the next. On my 48cc with the cns2 I'm at a 66 drill size, that's where the plug color got right. On other bikes I've tuned the stock jet (71 I believe) was OK. These things are very simple, that's why they drive us crazy!

So far all of my 66cc engines with NT carbs have liked a jet drilled with either a #72 or #73 wire bit, my RT carbs have both run perfectly with the #70 jet that came with them, only slight low rpm 4 stroking and zero under throttle or at cruise speeds and a nice medium brown spark plug electrode, climate and altitude play a part in all this jetting stuff also, so yes it is not universal when tuning the carbs, it's a matter of running the engine and figuring out what it needs and like the best based on how it is set up and with what exhaust it has which has a lot to do with the amount of air that can flow through the engine.

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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