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Old 06-19-2013, 07:16 PM
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Kohler 14 hp. problems..

I rebuilt an old style Kohler 14 for a lawn tractor. I have done many of these over the years but this one is biting me real hard..

Engine ran good, just smoked REAL bad..

Bored it .020" new piston/rings.
Re-grind crank .010" exact same part no. as original.
New .010" rod.
Resurfaced head
Valve grind
New intake/exhaust valves and guides.
Rebuilt the carb. Walbro side draft.
New points set .020" New s-plug.

Went together with one minor glitch. China inch is different than American inch and replacement rod had to be opened up .0005" for correct fit.
Cam&crank timing is correct. Valve lash is correct.

Engine starts a bit hard. Will only idle with choke at full. Will not run at speeds above idle. Just knocks/backfires/pops unless you hold your hand full over the carb and regulate air flow with air leaks around hand. Has good vacuum and pulls fuel from the bowl. Won't rev over about 900 rpm. Then backfires and pops out exhaust, dies.
Acts like vac leak, but carb is bolted to the head, ! gasket.
Had carb apart twice. Everything checks out great.
Changed points to .016" no difference. Good steady spark. New coil and condensor.
Haven't got it to operating temp yet because of problem. Maybe 10 minutes total run time with dozens of starts. With a couple hours of tinkering/adjusting.

Any small engine tune up guys have an idea of what is causing the problem.. Thanks BOB

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Old 06-19-2013, 07:46 PM
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you know your stuff, but did you lap the valves at all.
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Old 06-19-2013, 07:56 PM
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Not to be a smart a but is t possible the cam timing is off? The points are run off the cam so check the static ignition timing of the points compared to the spark timing mark on the flywheel.
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Old 06-19-2013, 08:30 PM
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Sounds like bad new chinese coil or condenser.
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Old 06-19-2013, 09:01 PM
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Quote:
Originally Posted by killeratrod View Post
you know your stuff, but did you lap the valves at all.
i don't lap valves. I have thounds of dollars in valve equipment so I don't lap, grind only, 45 degree and 44.5 degree= instant seat.

Thing has great compression.. Thanks tho..
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Old 06-19-2013, 09:03 PM
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Originally Posted by WICruiser View Post
Not to be a smart a but is t possible the cam timing is off? The points are run off the cam so check the static ignition timing of the points compared to the spark timing mark on the flywheel.
Checked it.. twice.. was my first thought.. thanks.
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Old 06-19-2013, 09:06 PM
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Sounds like bad new chinese coil or condenser.
aaah soo but it has a nos USA coil on it. I will check condensor but has great spark.. Thanks..

Last edited by BOBCRMAN@aol.com; 06-19-2013 at 09:16 PM.
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Old 06-19-2013, 09:36 PM
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aaah soo but it has a nos USA coil on it. I will check condensor but has great spark.. Thanks..
Hmmmm. Then must not be problem Oh honorable one
Is it possible the cam is ground wrong? Maybe you should degree it.Just a thought.
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Old 06-19-2013, 09:37 PM
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could the compression ratio be too high ?
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Old 06-19-2013, 10:06 PM
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Did you put a new shear key in it? I know that the smallest shear mark on the key can cause problems. Just a thought
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Old 06-20-2013, 11:24 AM
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Back to basics. Pull plug and verify TDC. Make a temp pointer and flywheel mark. Verify when spark occurs (continuity buzzer on points). Degree cam(you already made a pointer, not that much more trouble). Do the valves open and close when they should. If all that is correct, its to the carb (only runs on full choke is not enough fuel. Jets clean, float level correct, etc).
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Old 06-20-2013, 12:20 PM
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Hmmmm. Then must not be problem Oh honorable one
"probRem"
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Old 06-20-2013, 01:46 PM
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I'm feeling a little sheepish about that last comment.
I didn't mean to be malicious, but racial stereotyping still isn't cool.
My apologies to anyone that may have been offended ...
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Old 06-20-2013, 02:12 PM
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I'll hold hands with cal1320, on the "only runs on full choke - not enough fuel"


Duke
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Old 06-20-2013, 05:14 PM
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I'm feeling a little sheepish about that last comment.
I didn't mean to be malicious, but racial stereotyping still isn't cool.
My apologies to anyone that may have been offended ...
Hey, it's all in fun.
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