Exciterfan
Member
I can't seem to find a "how to" adjust the power valves on an 03 Viper. AM I blind?
I've read the Yamaha manual description, but I'm sure someone on here has a better method (description).
Also, did Yamaha fix the wiring harness issue by 2003 or should I be looking at that too? Fuel pump mod required too?
Thanks in advance.
Exciterfan
I've read the Yamaha manual description, but I'm sure someone on here has a better method (description).
Also, did Yamaha fix the wiring harness issue by 2003 or should I be looking at that too? Fuel pump mod required too?
Thanks in advance.
Exciterfan
From a MrViper Post:
I can save you alot of time and work, just start up sled, with plastic servo cover removed, and turn down the idle speed to under 900 rpm, this will fully open the powervalves, take a black perm. marker and mark the servo pulley and the housing. Shut off the sled. Now wheres theres the 2 bolts on the end of the power valve block, loosen those almost all the way out, now wiggle the cable end and it will pop open a gap between the housing sections, adjust this gap till its 2.5mm on each one by moving the threaded adjusters at the powervalve servo motor, make sure you keep the marks lined up on servo wheel and housing, do this for all 3 powervalves and then tighten up bolts, start engine up and readjust idle speed to 1800rpm, replace plastic cover.
I can save you alot of time and work, just start up sled, with plastic servo cover removed, and turn down the idle speed to under 900 rpm, this will fully open the powervalves, take a black perm. marker and mark the servo pulley and the housing. Shut off the sled. Now wheres theres the 2 bolts on the end of the power valve block, loosen those almost all the way out, now wiggle the cable end and it will pop open a gap between the housing sections, adjust this gap till its 2.5mm on each one by moving the threaded adjusters at the powervalve servo motor, make sure you keep the marks lined up on servo wheel and housing, do this for all 3 powervalves and then tighten up bolts, start engine up and readjust idle speed to 1800rpm, replace plastic cover.