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masafiddle1

K241S massive air/exhaust leak

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masafiddle1

Hello all,

 

I have inherited a 74 B100 with 10hp K241S 46636d when my father passed away. I remembered this tractor new, so when asked, I wanted it.  It runs and mows, however, the engine slows and speeds up randomly.

I left it running and lifted the hood. 1st thing I noticed was a loose plug wire, fiddled with it and she spurred up to max rpm. But that only worked randomly as well.(will replace wire soon). 2nd and possibly most importantly I noticed a MASSIVE amount of air/exhaust coming out of the "FIN" area (see pic)post-14984-0-26867300-1428790959_thumb.j Forgive me but, is this normal? I mean it feels like a high powered fan. Any other thoughts on Idle speed random variations would be much appreciated.post-14984-0-50855100-1428791381_thumb.j

Edited by masafiddle1

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masafiddle1

I am suspecting that this airflow is normal as it is probably blowing over from the other side. I checked the exhaust bolts and they all seem tight with a good gasket in between. Sorry for small engine ignorance, and thanks in advance to all.

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wallfish

:WRS:

All that air is normal. Created by the blower fins on the flywheel from the other side. It's how the engine is cooled.

Surging RPMs (hunting) is usually caused by a dirty carb.

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masafiddle1

Thanks WallFish for the tips and the welcome. I will proceed to R&I the carb, tear it down and clean it all up. Should be exciting. :) I plan to gradually teardown and clean and refurbish as much as possible. The cosmetic stuff I can do easily...cleaning,painting,dents and whatnot. But, I go into engine diag and work cautiously.

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rmaynard

Also, download the Kohler service manual and check your governor settings. An improperly adjusted governor will cause surging.

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KC9KAS

:WRS:

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953 nut

:WRS:   The loose plug wire may have fouled the spark plug, a few bucks for a new one couldn't hurt. Also, if the shaft on your throttle is too loose that could be a cause of hunting.

:text-welcomeconfetti:

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meadowfield

worn linkages also cause hunting...

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masafiddle1

Sorry that it has taken so long to get back here. I found the "Hunting" problem. The coil to plug wire was worn and brittle and the coil ground wire was just hanging by a thread. After some acrobatics while driving with the hood up I just happened to catch a glimpse of the spark arc right as it surged. I replaced the coil wire and put a new end on the ground and "VahVoom", she's a roarin!
Thanks all.

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oldredrider

Thanks for following up on your problem. That will help others!  Glad you got it fixed.

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