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I have a 1991 530 EXT snomobile it runs good till i refule or stop for a short wile and when i get going on it again it acks like it wants to fud out or something like it i can let it idle and it is good till i hit the throttle and wants to bough down in rpm what can i do to fix it

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Considering the age of the machine, I would pull the motor out of the machine, buy a complete gasket and seal set (you can buy a piston kit with gaskets and seals for under $200) ,Tear it apart and replace the crank seals and all the gaskets. The old pistons have worn to an oval shape and are at high risk of breaking a skirt. New square pistons(side view) and rings will restore performance. Do the lightest hone possible on the cylinder. Inspect the intake manifolds for cracks or tears and reassemble the motor. The new seals, gaskets, and intake manifolds (if needed) should take care of the bogging. The new straight pistons will preserve your cylinders and raise compression. Taking apart and cleaning the carburetors while they are off will take care of any other potential motor issues and the rebuild should keep the motor alive for another thirty years.
If all you want to do is get through another season out of the machine , grease the suspension, replace the crank seals, inspect or replace the intake manifolds, and clean the carburetors.
The stock crank seals have a lip around the edge that requires you to split the cases to install them. They can be removed with out splitting the cases. But you will have to replace them with after market seals that are flat on the edge if you are planning on short cutting the repair.

Posted on Nov 15, 2010

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