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my 1980 moto ski ultra sonic has 110 psi in the right cylinder and 30 psi in teh left cylinder what would be teh cheapest fix? and does bad crankcase seals cause the motor not to run? where are good places to buy parts for a sled liek this?
 

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Could be a few things, have to take it apart to find out. Best case scenario, stuck ring(s), worst case you need a new piston kit and bore the cylinder out.(as long as everything else is alright in the engine. A leaking crank seal could cause a lean condition and burn out a piston, it might still run but could have a high or erratic idle. Places like mfgsupply.com and Pat's small engine should have what you need.
 
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