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Motorized Bicycle Trouble Shooting Use this area to post problems that may arise that you could use some help in figuring out what is wrong with their bicycle motor and what needs to be done to achieve top performance.

Another carb question


Discussion at Motorized Bicycle Engine Kit Forum in the Motorized Bicycle Trouble Shooting forum. Hey Guys My engine is running pretty good(Dax 70cc) but one thing I notice is it seems to want ...
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Old 03-07-2009, 11:02 AM
ran49's Avatar
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Default Another carb question

Hey Guys
My engine is running pretty good(Dax 70cc) but one thing I notice is it seems to want to four stroke when cruising and not under any load.Any acceleration or slight hill and it really kicks in.Running slightly rich I'm guessing.I know this is pretty much how you want to tune a chainsaw.So is this what your looking for on these engines.Thanks,Ron
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Old 03-07-2009, 11:12 AM
Bikeguy Joe's Avatar
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Default Re: Another carb question

That is about right.
These old school piston ported two strokes are actually running about right when they run as you've described. You could go a little leaner and listen closely to the engine....I'd bet it still four strokes at no load conditions, and you'll maybe get a slightly better run at lower speed throttle settings, but it will run too lean at or near WOT or higher rpm.
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Old 03-07-2009, 12:17 PM
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Default Re: Another carb question

Thank you BJ.I'll leave it well enough alone.That will be a first.Ron
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Old 03-07-2009, 07:23 PM
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Default Re: Another carb question

See my signature....
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Old 03-10-2009, 02:23 PM
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Default Re: Another carb question

I went from the stock jet to a #68 Dellorto and noticed a huge difference in top end performance while relying on the needle clip adjustment for off idle to WOT bogging. Thats just a bit smaller than the stock one, im waiting on another at the moment, a #65. I let you know how it works out.
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