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kohler cv16s hard starting, oil leak


diydiy27's Avatar
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11-25-12, 08:39 AM   #1  
kohler cv16s hard starting, oil leak

This spring I replaced the carb, gas filter on my 12 yr old mower. Gas in the oil. It was running great. Last three times using mower this fall very difficult to start. Once it starts it runs fine. Plug is clean and a good spark. Fuel solenoid clicks with key being turned. Fuel filter is full of gas. In reading posts it seems a key fails on the flywheel. Would that be the next step? Also any web site that has an exploded view of this engine?

There seems to be a leak on the fuel pump/dipstick side of the engine. I will clean it up then after use that section of the engine will be slick with oil. I'm thinking a gasket has failed on the pump or o ring on the dipstick tube. Is this reasonable to think? I check the oil level with the dip stick not screwed in per the manual.
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11-25-12, 11:50 AM   #2  
The carburetor is leaking the fuel into the oil. You need to clean it and possibly replace the needle valve.


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11-25-12, 01:49 PM   #3  
Thanks for the reply. The oil seems to be free of gas though. I went through that last year and this seems to be a different issue. The plug was wet and there was a problem with the engine turning over with all the fuel that leaked into the cylinder. Now the plug is dry and no problem turning over to start.
I pulled the key from the flywheel and it looks crooked so I will replace that. The coil has me wondering though. Following the Kohler instructions to test the resistance of the coil I get one reading between the wide tab and laminate in spec. I have an open circuit on the other tests narrow tab to laminate and plug lead end to laminate. Yet I had a spark at the plug. Is the coil partially shot?
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11-25-12, 06:49 PM   #4  
Okay, I see now that you HAD gas in the oil before the carb replacement, but now there is none?

Your coil should be fine if it's sparking. I don't know if your meter is on the right ohm range or what, but there has to be some (supposed to be very high resistance) reading between the wire and the laminations for it to be sparking. Sounds to me like the choke is not closing fully.


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11-29-12, 02:44 PM   #5  
I rechecked the coil and tests out fine. I watched the choke flap and it opens in the correct position and closes off the carb in the choke position. I replaced the flywheel key and there is still a problem with hard starting. If the throttle is just barely cracked open it will start sometimes. It has to be barely off idle. Anything more, coughing and backfires. If it starts, once it warms up it preforms perfect. If the engine is still cold it will not accept more throttle. It dies. Now the carb is my main suspect. I will check the needle valve and seat any other suggestion?

 
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11-29-12, 07:45 PM   #6  
If it starts with the throttle down low, but not up on choke, that sounds like it's not getting enough fuel on choke. When you close the choke, can you close it just a hair more by hand?


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