Viper Comperssion????


comp readings are going to be like 10lbs less on the pto than the center and mag cylinders, cause the dome of the head of the pto cylinder is larder in cc volume.
 
Why is the head different on the PTO side?

When checking compression, it is true you should warm up the machine, and open your throttle all the way while pulling or turning the motor over to the most accurate numbers?
 
they did that on the viper to allow straight jetting. On the old sleds they ran straight compression and stagered jetting. No idea why they switched it. Maxdlx
 


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