Vector88
New member
hey guys
my viper doesnt seem to have all of her power. done a cmpression test on the motor tonight and i got 120 psi for right and middle block. but i only got 100 psi for the left block. would this cause my viper to loose power? i also recently cleaned my powervalves but did not adjust them. just left them how the previous owner had them. would this cause her to loose power if they are not adjusted the same? also, what is the normal compression for a viper motor? my freind had a 2003 mountain max 700 and his blocks had 130 psi each. seems like my machine when at low rpm, sounds liek she is only on 2 cylinders. any comments will help! i am planning on getting new piston rings for all 3 of my pistons
my viper doesnt seem to have all of her power. done a cmpression test on the motor tonight and i got 120 psi for right and middle block. but i only got 100 psi for the left block. would this cause my viper to loose power? i also recently cleaned my powervalves but did not adjust them. just left them how the previous owner had them. would this cause her to loose power if they are not adjusted the same? also, what is the normal compression for a viper motor? my freind had a 2003 mountain max 700 and his blocks had 130 psi each. seems like my machine when at low rpm, sounds liek she is only on 2 cylinders. any comments will help! i am planning on getting new piston rings for all 3 of my pistons
daman
New member
did you test @ opp temp WOT a good 6-7 pulls??
adjust your pv's see if it's better, if it's not tear into it
and replace your stuff sence you have it and you plan on doing it
you may have a issue and don;t know it..
adjust your pv's see if it's better, if it's not tear into it
and replace your stuff sence you have it and you plan on doing it
you may have a issue and don;t know it..
Vector88
New member
took about 3 hauls and it was up to 120 psi on the right and middle cylinder and i hauled like 10 times on the left cylinder and it was only staying on 100 psi. so i think i have bad rings. also, do i have to idle my machien down below 1000 rpm to adjust the pv?
daman
New member
yes,,,unless it's a ER model(just turn the key on), or you have a pv tester..rx-1mountain said:
Vector88
New member
so...when i adjust the pv idle the sled down below 1000 rpm, unscrew the cables all the way at the servo motor and take the 2 bolts out of the top of pv and put the allen key that i used to unscrew the 2 bolts between the pv and tighten the cable bolts are the servo motor until the the cover of the pv brings up on the allen key?
daman
New member
Vector88
New member
also, would i feel a difference if the pv's were all adjusted differently and if i adjusted them all the same. just say that the pv's are currently all different that each other and if i adjust them all over and all the same adjustments, would i feel a difference in my viper?
daman
New member
not really no,,just set 'em right then hold on........
rparsons
New member
tell me what happens i have the same problem
MountainRx1
New member
Vipers came stock with 130 Mag and Ceter, and 110 on the PTO side. Why they did that I don't know, they just did. Hope this helps.
Bigsur
New member
Vipers came with a lower compression piston / head assembly on the #1 cylinder. This was to allow for straight - across jetting on the triple carbs. (If you noticed, all main and pilot jets are the same for all three carbs). It's normal for the #1 cylinder to have lower compression. According to yamaha documents, the compression ratio on the #1 cylinder is 5.9:1, while #2 & 3 are 6.7:1. Hope this helps...
