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#1
07-04-2025, 12:22 PM
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After rebuild woes
After a rebuild, my K301 ran fine for the 15 minute break-in run. Ran it at various throttle positions and it ran great. I then let it cool down over night, re-torqued the head bolts and tried to start it. Would hardly start. Got it started at idle throttle and some choke. At idle, it runs OK. Any position of the throttle above idle and it barely runs. Quite a bit of snorting, coughing and a missing. It will die fairly quickly if I don't get it back down to idle
I thought(more like hoping) it might be the high speed mixture port so swapped out with a known good carb and same symptoms At idle, as I mentioned, it runs pretty much OK. But if I hold my hand in front of the carb, it is apparent the intake valve is not closing all the way (or in time) as my hand feels a backdraft of air and fairly quickly gets coated in gas. I've had this happen in my life twice, and once was broken valve spring and one time an engine dropped a keeper. So I pulled the breather and the springs, keepers and valve clearance are all OK. I have limited with small engines and none with compression release. So I am humbly coming here with hat in hand hoping for a little help, guidance and direction as to how to proceed. I am at a loss. Many thanks in advance! 1966 123 with a Kohler K301 
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| highspeedmiss, k301, rebuild |
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