Blowby & Difficult Starting


Old 02-22-02, 12:46 PM
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Oily blowby in air cleaner and diificult starrt

I have a 300cc golf cart motor (yamaha), single piston.
Got the motor and it was said to burn a lot of oil.
Replaced the rings and rebuilt the head. They needed it and hoped to get away with just doing that.
I have good compression and ample spark.

Problem: Oily blowby into the air cleaner box and very difficult start. It surges pretty violently when choked.
It will not start without the choke and/or starting fluid.
When running, rpms must be fairly high to keep it going.
Even when warm its difficult to start.

Please help, this one has got me stumped.

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Last edited by Sharp Advice; 02-22-02 at 01:42 PM.
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Old 02-22-02, 06:00 PM
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Hi cmorris,

There are several possibilities...Did you check the ring gap when installing them? Is the cylinder wall in good shape and properly honed? Are the ring gaps staggered at 120 degree increments? Is this an overhead valve engine? Were the valve guides checked? Are the valves too tight? These might cause the blowby, and possibly the running problems, but it sounds like you may also have carburetor trouble. Let's start by eliminating these suggestions and go from there.

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