compression test procedure

I would say a Viper should have around 130 on the Mag and Center cylinder and about 110-120 on the PTO side. The PTO side has less compression on a Viper. Every compression tester can give a different PSI. As far as what's the most accurate way.....I don't know.

Some of the Viper owners will know for sure. ;)! This is just numbers I seem to remember being the most common.
 
warm temps, open throttle, 6 pulls, craftsman comp guage,

130 on mag and 132 on center

120 on pto

5,000 miles and motor has never been open

time to replace the original plugs though
 
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