Engine Trouble Engine Is Jerky At Low Speed

[cosworth]

I've got about 50 miles on my new motor and thought the engine would smooth out by now. Problem is that between 12-15 mph (approximately) the engine jerks. It isn't until it get over that range does it smooth out - some what. I've read the forum and have looked for a cure (i.e. O ring in the carb to seal out air, check all gaskets, tighten all nuts, played with needle positioning, went hotter and colder on the plug, went to a heavy duty chain with CNC machined sprocket and hub drive etc. I'm open to any and all suggestions

 

[crassius]

kind of a general problem with 2-strokes - power isn't steady all across the throttle range

you're kinda stuck with big sprocket for low speed smoothness or smaller sprocket for top speed

other option is to go with a shift kit

 

[Deleted member 12676]

jerky? sounds like a clutch problem.

 

[cosworth]

kind of a general problem with 2-strokes - power isn't steady all across the throttle range

you're kinda stuck with big sprocket for low speed smoothness or smaller sprocket for top speed

other option is to go with a shift kit

I appreciate you input. If I had done more research, or knew about the forum before hand, I would have gone with a shifter kit.
Thanks again for your time.

 

[Samdallas214]

My did the same thing jerked at low speed and stopped at higher speeds.
In my case the engine was bran new less then 25 miles on it but it had a broken clutch spring

 

[Fabian]

If I had done more research, or knew about the forum before hand, I would have gone with a shifter kit.

It's never too late to get a shift kit - best thing since sliced bread

 

[cosworth]

Thanks for your input. Clutch seems fine and engine doesn't cut out but I'll check it.