To my understanding the Nytro and Viper secondary clutch fits on the Sidewinder, but what about the Nytro primary clutch on a Sidewinder?
If so - anybody that what to share there offsett measures on different primary and secondary combos:
1. Offsett with both Nytro primary and secondary
2. Offset with Sidewinder primary and Nytro/Viper sexondary
3. Offsett with Nytro/Viper primary and sidewinder secondary
Thanks in advance!
If so - anybody that what to share there offsett measures on different primary and secondary combos:
1. Offsett with both Nytro primary and secondary
2. Offset with Sidewinder primary and Nytro/Viper sexondary
3. Offsett with Nytro/Viper primary and sidewinder secondary
Thanks in advance!
Another question should be what torque is used if swapped? The old or new. The old clutch should easily take Sidewinder power at the lower 80 lb initial torque. Does going so much more on the new suck it in more? Even in this day and age of CNC and precision machining a taper can vary a bit,Materials can vary etc. The right way to make that Taper would be precision ground and then lapped to fit by hand. They never have been done that way. Interesting questions TT!
Crossfire12
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WHY ?? Put Chevy engine in a Ford, put the right one on way better than dicking around, cheaper just saying!
rxwhopper
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We have lots of guys running nytro/viper secondarys in this are and sidewinder belt issues dissapear.I was wondering on primary also as the 270 viper never ate belts like winders do so why not use something thats proven till maybe yamaha figures out a cure.
ROCKERDAN
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I have not read of any.....the guys I saw who did swaps still blew belts.
If you know of some, please post....Im all for finding out a solution to belt blowing.
Dan
Crossfire12
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Dan, are you still running reverse angle helix? If you changed to non reverse angle did you have less belt blowing. Just asking. I have just put 270 r tune in sled and purchased a STM roller secondary and haven't bought helix yet, just curious what you ended up with. I know I have AC but! I haven't had problems with belts in stock form.
ROCKERDAN
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I doubt you will see belt issues owning the cat. From everyone I talk to and follow, the cats have not had nearly the same amt of belt issues when wick'd up. Even guys i speak with who run their cats with 22/41 gearing and same hurricane tunes I do, are happy with their belt life.
That being said, I have blown a belt on both the 33/35 reverse angle helix, and also the 39/35 progressive angle helix. The first belt was the ultimax, it went down with basically zero miles on it, and so I attribute that issue to a poor initial setup on first 270hp run. I had the 33/35 reverse angle helix along with that orange TP spring setup way way too stuff back when we were all told to set them there. I should have known it was bad as I could barely put the secondary together as the orange was stiff to begin with then the settings were too much. So it snapped as soon as I hit the throttle.
I pretty much removed that setup, and went to the 39/35 progressive with Dalton bk/orange set where Dale said to, and ran that setup for approx 600 miles hard on 270 before the 8jp blew. For corner to corner I do like the reverse angle more as it revs higher down at very bottom, but the 39/35 also works well down low IF i run the 270/290 maps....the 240 map with the 39/35 is too poochy at the very bottom for my trails and liking, but works well in Qc trails.
Im not sure which way I want to go with helix for this season yet....Im thinking a compromise of reverse angle but not as low as my original helix i ran. The ultimax snapped in two instantly, so that was due to way way too much back-pressure, clutch simply could not open fast enough and pulled belt in two.
Also remember the SRX is gonna come with a lighter pink apex sec spring when using a reverse angle helix. YAM seems to want the secondary to open very easily to keep temps down. Just not sure how well that will work, seems to me it could be to the point of slippage. Its all back to test and tune i guess.
Dan
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Take your Sidewinder through a day of riding in 6-8 feet of powder then you might understand why good and cool clutching is intersting. Apex and Nytro clutch setup never had the isssues some are seeing. You could run +300hp in the mountains/off trail all day without a issue. Thats is why I have the questions. If you have any answers - feel free to share them in this thread.
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Tarzan
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I have now mounted the Viper secundary and Apex primary clutches in my Sidewinder. I dont trust the Sidewinder clutches,so many primary that have exploded and that with stock weights and aftermarked weights. I have run for years 380-390 hp on my Nytro with Thunder produkts weights and with no isues.
WVTurboLTX
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My MPI Viper ate belts also. I sold it before I ever figured it out.
Doowithblue
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Imo the harmonics and the offset played a major role in the 17/18 sleds. Time will tell.
Keep us updated with your results during the winter - whats offset are you going with apex OEM specs?
Tarzan I have had very good luck with this setup on my BTX, 2.6» lug track:
MTX gearing in chaincase. 8 teeth drivers. Center to center 264mm between primary and secondary clutch. Offset set at 58.5mm. I had to lathe the secondary and removed 2.6mm of the hub.
Primary: Dalton DTYA1 weights, Dalton black/green, or black/blue spring and glide washers (Thunder products). Stock rollers.
Secondary: EPI Artic Cat spring (almost same specs as AC green snowpro spring) set at 20 degrees (off set tabs on this spring vs a yamaha spring there for only 20 degrees twist) Dalton 41/37 helix.
Yamaha apex drive belt and Moflow side vents. This total combo solved my hot clutches. No blown belts.
I have tried heavy hitters and TP springs, with different helixes (36, 33-35, 35/39, 37 and 41/37) But could not find the combo to get the heat down.
But I am still interesed in trying out complete Nytro clutch setup on the sidewinder. There for very interested in your findings.
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Agreed on the offset. Hurricane pointed it out early.
But we have seen harmonics in all three cylinder 4-stroke engines from Yamaha. Maybe the 998 engine is worse. I guess Hurricanes fix for this issue will give us that answer during the upcoming season
If we are just talking the Stubshaft and Primary clutch we know for sure the Stock Stubshaft in a Sidewinder has to be lighter than any before since the Relucter gear was removed. I know that doesnt seem like much but I am telling you guys even a 1/2 ounce in a assembly spinning 9000 rpm matters. That said has anyone ever weighed the old and new clutches?
