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Antique Gas Engine Discussion

Need help: Cushman Cub won't run right


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  #1  
Old 03-22-2005, 06:16:58 PM
Chris Kirk Chris Kirk is offline
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Default Need help: Cushman Cub won't run right

Hello all -

I'm trying to get a little Cushman Cub running, and something's not right. When I got the engine, it had no mag on it, so I bolted on an EK that I'd bought on Ebay. The mag seems to have a healthy spark, and the spark plug wire is new. The engine will run, but it runs very erratically...sometimes slow, sometimes fast. It will almost always fire on the first spin of the flywheels, but then it either dies, or runs VERY slowly, or not at all. When it runs slow and rough, it only fires about every 10 revolutions and almost stops before it fires again, and then it hits REALLY hard...at one point it got about a foot of air and jumped off of the dolly it was on. A few times it's fired every revolution, but still rough and slow and REALLY loud...I'm getting a 6" flame out of the muffler. Twice, however, for no reason it just seemed to smooth out and run like it should, but only for a minute, then it died, and ran badly when I tried to start it again.

The mag trip is a spring, and it seems very sensitive...1/4 turn too far one way, and the armature won't return, 1/4 turn to far the other way, and the the mag won't trip...I've never dealt with a Cushman before, so I'm not sure if this is how it should work or not. When I got the engine, the mag return spring was missing, so I got a new one, courtesy of HitnMiss. The mag is gapped correctly, although it someone replaced the condensor with what looks like a modern lawn mower type condensor. Other than that, everything seems to be in order.

Any suggestions?

Thanks...

Chris
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Old 03-23-2005, 09:37:43 AM
D.Smith D.Smith is offline
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Default Re: Need help: Cushman Cub won't run right

Kris, A friend had one like that. had much trouble with return spring till we got the happy meidem. Still had running problems and it narrowed down to worn throttle shaft upsetting airfuel ratio. I also recall that the little disc in the carb wasnt the proper one. D. Smith
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Old 03-23-2005, 11:04:24 AM
Jim L. Brown Jim L. Brown is offline
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Default Re: Need help: Cushman Cub won't run right

Kris: I think the others have it pretty well identified. Realizing that these things are 70 - 80 years old, it can be a combination of factors. The WICO EKs can be very sensitive, but I have found the carbs to also be sensitive, especially if somewhat worn. Had one running fine at home, but had all kinds of trouble at a show - thought it was spark, but it was the carb. Now I generally take a spare carb to shows with me - only takes about 3 minutes to change it out. Jim
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Old 03-23-2005, 02:22:07 PM
BobRR BobRR is offline
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Default Re: Need help: Cushman Cub won't run right

Quote:
Originally Posted by Jim L. Brown
Had one running fine at home, but had all kinds of trouble at a show - thought it was spark Jim
Jim what you have is The tipical engine at show sindrom.The More people watching the better the chances of your engine not starting or running really bad! Best is to start them early when no one is looking! BobRR
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