Spinner18
New member
i guess the question is, is there to be gained by removing material from the helix without touching the primary clutch sheaves? I would like to know as I have an xcr thats been bugging me to run him... and i would like to have any advantages i can...
Mac
Member
tofastSRX - You have asked twice if machining the primary is necessary. The answer has two parts. Part one: When you machine only the secondary helix you will prevent the secondary from being the part that limits shift advance.
Part two: Machining the primary will allow the clutches to shift even further into overdrive.
If you really want to know where to machine either clutch simply remove the spring re-assemble and cycle the clutch to simulate where the limits of clutch travel occur.
Please note: I dont know if SRX are differ from Viper center to center or clutch to clutch.
Part two: Machining the primary will allow the clutches to shift even further into overdrive.
If you really want to know where to machine either clutch simply remove the spring re-assemble and cycle the clutch to simulate where the limits of clutch travel occur.
Please note: I dont know if SRX are differ from Viper center to center or clutch to clutch.
There is no magic pill. For it to work, you need to test, tune, test, and tune. Dont just cut your clutches up and think there will be an extra few mph.
the billet helixes you buy from most manufacturers are already cut to the bushing.
the billet helixes you buy from most manufacturers are already cut to the bushing.
Mac
Member
Scott not looking for a magic pill but.... This is an easy modification. Has no real cost $$$ to gain MPH. How many MPH will we gain by simply machining the helix before the Primary bottoms out? The problem most members will have is trying to measure the true performance gain.
knocksum
New member
I want to bring this back to the top. Anymore testing being done?
jabber800
New member
Betheviper is right on the money!! This mod will help only if everything else is set up perfectly on the sled. Clutching gearing and riding conditions have to come together. We have seen speeds as high as 126 mph (radar speed) with modded yamaha clutches and gearing for 110 mph at 1 to 1 . Meaning we have pulled around 15 % overdrive..
Hey guys here's what I've found with the overdrive on my SRX. I've actually removed the springs out of the secondary and primary and what I found was that the belt could not get right at the top of the primary because the belt was to tight. So what I thought was to change the center to center distance to compensate for that to let the belt go to the top. Has anyone else check this?