QRS Secondary Machining

[summitboy]

I have been asked for some pics of the QRS machining that allows you to get the proper deflection once the belt is stretched/breakin. Here are a couple of pics. 50 thou off the center and then a chamfer. I did not come up with this but am passing it along since so many seem to be interested. Enjoy

 

[fredw]

would you be able to circle the exact part that needs to be machined, i will take picture to the machine shop today, buddy works there and would love more belt adjustment

thanks again

 

[summitboy]

It is the center collar on the top picture. If you take yours apart and compare you will see the difference. BRP meant for the sheaves to close more. There are 3 feet that were meant to touch the inside of the inside sheave. The way it came from the factory the center collar touches first before the feet. When the belt stretches the adjuster can be all the way out and the belt still has too much deflection causing the sled to start out out in high gear which really builds heat fast especially when in the bottomless snow. The plastic adjuster is a very poor design and BRP could of done much better. I know a guy who is designing a metal part to replace the plastic and it will use set screws to adjust the deflection. If he comes through first he will sell a ton of them i'm sure. I think you will see a wider belt from Doo shortly. It will be the cheapest and easiest fix for them. If you need any more help with the machining just ask.