Clutching help

[KnappAttack]

So near as I can see the mid and bottom of those sheaves looks to be a little bit of polishing and slight black on them. If it were me I'd start by cranking up the secondary spring up, 20 degrees to start, then another 10. Don't be afraid to wrap it right up it as that V1 B/o is weak. I think you are going to need to have it wrapped up at 90-100 degrees on V1. 95 degrees on my v1 and I still did not yet have near enough side pressure and that was running the 825 belts too.

You should be running the V2 for more pressure. V2 for me on a 90 wrap was 35 lbs more than the V1 at a 95 wrap. I've found better speed myself with more secondary

Running that much weight up front does not jive for less than 300 HP. I think with that much weight it could be rotating the belt in the secondary. I'd like to see the log on a run to see what's really going on. I'd say the balance is a ways off there.

You guys need to be scaling the secondary on a drill press scale to find what works. I've found I need at least 325-330 finish rate on a 37 to 35 finish helix. 300 lbs like the V1 spring has is not enough and can't hold the power with that type of finish helix at least in the snow on my sled it can't. Maybe on ice possibly, but you just got to keep testing and making passes to learn it. I would try more helix, more secondary spring wrap and less weight in the primary.

Your best runs will be first thing in the AM and last thing in the afternoon right before dusk. TEST, TEST and TEST. Same day testing will teach you a lot. Testing on different days will not teach you much unless you really know what you are doing for different conditions.

 

[DMCTurbo]

So near as I can see the mid and bottom of those sheaves looks to be a little bit of polishing and slight black on them. If it were me I'd start by cranking up the secondary spring up, 20 degrees to start, then another 10. Don't be afraid to wrap it right up it as that V1 B/o is weak. I think you are going to need to have it wrapped up at 90-100 degrees on V1. 95 degrees on my v1 and I still did not yet have near enough side pressure and that was running the 825 belts too.

You should be running the V2 for more pressure. V2 for me on a 90 wrap was 35 lbs more than the V1 at a 95 wrap. I've found better speed myself with more secondary

Running that much weight up front does not jive for less than 300 HP. I think with that much weight it could be rotating the belt in the secondary. I'd like to see the log on a run to see what's really going on. I'd say the balance is a ways off there.

You guys need to be scaling the secondary on a drill press scale to find what works. I've found I need at least 325-330 finish rate on a 37 to 35 finish helix. 300 lbs like the V1 spring has is not enough and can't hold the power with that type of finish helix at least in the snow on my sled it can't. Maybe on ice possibly, but you just got to keep testing and making passes to learn it. I would try more helix, more secondary spring wrap and less weight in the primary.

Your best runs will be first thing in the AM and last thing in the afternoon right before dusk. TEST, TEST and TEST. Same day testing will teach you a lot. Testing on different days will not teach you much unless you really know what you are doing for different conditions.

What do you mean by rotating the belt in the secondary?

I've done alot of testing trust me but I'm still learning and open to suggestions to help me improve.

We had a guy show up Saturday that has put up some big speeds at NBSSR events and I was right there within a mile or 2 an hour and I was running less boost. I was pretty happy to be in the same ballpark.

I think my buddy has a gen 2 spring that he wants to sell so I'll grab it and give it a try.

A few guys I know up here running the TD MS17 tune are all around 85 grams or so on the daltons. Going tighter in the secondary will require more primary weight or less spring rate.

Thanks for the advice. Much appreciated.

 

[0degC]

I have tried the stock yellow spring and went backwards (with 8jp). I picked up an XS825 and will break it in easy this weekend. I realize I'll need to go down weight. Do you think the xs will help with the slip up top?

The XS belt is worth trying they grip well. First run testing with this belt would leave secondary as is for now and take some weight out of primary what ever will give you 200 rpm or so. I know nothing in detail with Yamaha clutching just going by what you are telling us and where you are at now. Can’t be slipping in secondary but this belt may just give you what you need. I agree with advise on stiffening secondary if needed but try belt first. Stiffening your secondary too much in the radar game will give you better et (better average speed in run) but a bit less speed at 1320 I have found. But wind that secondary up and add primary weight if drag racing....

 

[DMCTurbo]

The XS belt is worth trying they grip well. First run testing with this belt would leave secondary as is for now and take some weight out of primary what ever will give you 200 rpm or so. I know nothing in detail with Yamaha clutching just going by what you are telling us and where you are at now. Can’t be slipping in secondary but this belt may just give you what you need. I agree with advise on stiffening secondary if needed but try belt first. Stiffening your secondary too much in the radar game will give you better et (better average speed in run) but a bit less speed at 1320 I have found. But wind that secondary up and add primary weight if drag racing....

I'm spending this weekend with my 75 yr old father trail riding so I plan to break in an XS easy and test the following week.

Going back to the old srx days we used to radar faster with less secondary pressure so I understand what your saying.

I'm looking forward to making passes with the XS to see if it puts me over the top.

Thanks.