start at low idle?

mark skywalker · #1 (**permalink**) 09-10-2009, 05:56 PM

Hey there! Got my bike all built and running and stuff finally, just trying to figure out how to keep it at a lower idle. It's only taking off from a stop at real high idle, but when i adjust choke to idle lower, I let the clutch out real slow but it won't take off at that level.

any ideas about that?

thanks!

(it's the 66 cc 2 stroke engine)

bseelbach · #2 (**permalink**) 09-10-2009, 10:05 PM

Adjust the idle screw on the side of the carb. It the only screw there and it has a spring on it. Unscrew to lower idle and screw in to raise it. As a rule of thumb, I think 3.5-4 rotations from totally screwed in is about good. Tighten it in and then back off. Not too much or the screw will vibrate its way out.

Venice Motor Bikes · #3 (**permalink**) 09-11-2009, 02:23 AM

Your choke lever should always be "down" after the engine is warmed up...

Also, you need to still pedal the bike when you start from a dead stop. (don't just take off using only the clutch!)

One more thing... if the idle is too high, & you're having trouble bringing it down?, make sure there are no air leaks @ the carb.

mark skywalker · #4 (**permalink**) 09-11-2009, 04:22 AM

ok awesome! I wasn't even sure about the pedalling situation, but that's good to know. Just gotta figure out how to widen the pedals now to clear the engine and should be good to go.

Venice Motor Bikes · #5 (**permalink**) 09-11-2009, 10:51 AM

Just buy a new crank... Or if you have a torch, you can heat it up & bend it.

Snogcel · #6 (**permalink**) 09-28-2009, 04:37 PM

Hello!
I had that problem - my crank was colliding with the engine case. It was close enough, though, that I could simply grind some metal off the engine-facing-side of each pedal crank, until enough clearance was made for smooth pedalling. I didn't even need to remove the crank from the bicycle (an old Schwinn "Touring" bike.)

Good luck!