880 Idle Speed

super99 · Oct 30, 2020

I had time today and it was warm enough to take my gloves off, so I got the 880 gas back together after replacing the governor bushing. I set it according to the book and it runs good, accellerates smooth and no surging. I&T manual says idle speed is 375 rpm unless it has a magneto and then 500 rpm. It dies before I can get it that low, it seems happy around 700 rpm. It has a Zenith carb, I tried adjusting the idle screw and it would die before getting below 500 rpm. What speed should it idle at?? Thanks, Chris

rustred · Oct 30, 2020

probably need a carb cleaning, due to idle circuit not clean. should be no problem to idle at 400 rpm.

super99 · Oct 30, 2020

Ok, one more thing to add to the to do list!! Thanks

LandonT · Nov 6, 2020

Just did clean the carb and put in a throttle shaft on the 880 gas. But it still runs way too lean. I have to choke it to get it to smooth out above idle.
Will check the main jet size. It's a Marvel Schebler TSX775 on mine and this carb was also used on 550/660 so the main jet may have been mixed up. It acts like there is a vacuum leak.

- Landon

scootergmc · Nov 7, 2020

I thought the 880 carb was a zenith?

880 Idle Speed

super99

Well-known Member

rustred

Well-known Member

super99

Well-known Member

LandonT

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scootergmc

Well-known Member

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