I put in the black secondary spring on my '02 P650 (only 29 miles, 4 hrs) and I have a question.

1. What do you guys use to measure the 12 lbs of force you apply when checking the belt deflection? I guestimated the 12 lbs and it appeared that I had 25 mm of deflection (22 - 25 is spec).

 

I use a good fish scale. I learned the hard way, you can not guestimate the force. Read the shop manual, use a scale of some sort. Good luck!

 

I used a fishing scale and a buddy used a trigger pull scale, use your imagination (not literally).

 

I use a Gates belt tension tester. It's about the size of a tire pressure gauge and is really easy to use. A millwright at work gave it to me so I'm not sure where to get one.

 

Think I'll ask around the auto parts stores, maybe they have a belt scale. Maybe Gates sells it thru their distributors.

 

The belt deflection spec is 22-27mm. If you are getting 25 thats great. After 80 miles mine developed a chirp on take off. I checked the deflection and it was 31mm. I removed one spacer that was .024" thick and the deflection dropped to 24mm.