BoostMe
New member
Hello guys, I am dealing on a local viper, i have lots of expierence with the yam trips but not with the power valves!! This guy did a comp test and the comp was 105 pto, 120 cent, 120 mag ! He of course tells me that it is common for a viper to be that much lower on the pto side! Any input??
he is right. The compression ratio on the pto will be lower than the other two. I think they did this for easier starting, but am not sure why.
yamaholic22
Active member
yes that is normal, and they did that so that you dont have to run staggered jetting, which was previously required with straight compression because the pto runs hotter and needs fatter jetting to stay safe.
Yah, what he (^^^^^^) said. I have an article from the original product review (OSM I think) and it states exactly that.
BoostMe
New member
Thanx alot guys!! In that case does this comp seem fine, i know 120 is fairly standard for the old red tops but is it good for the powervalves
Thanx again all
Thanx again all
yamaholic22
Active member
exact numbers vary alot with different gauges. Just make sure that the numbers are real close (for the center and mag on the vipers, being that the pto is so much different). That is the most important.