I feel like I’m beating a dead horse with clutching on my 18 50th 162. Been fighting belt and primary roller issues for 2 seasons. I bought the Hurricane alignment tool this fall and it showed that my secondary needed to move inwards about 1mm. I’ve had two dealers at separate times align the sled and both times they had to machine more off the secondary to bring it in. Something isn’t right, so I pulled the stub shaft off the crank and found that the bearings weren’t pressed into the housing all the way, which I guess when you explode a belt the shock tends to move the stub shaft in. So Yamaha warranties a stub shaft but then the dealer had to add shims on the secondary to bring it back out, as for two years we have been aligning it to a primary that has been progressively moving inwards. So now owning the alignment tool I can monitor this myself. I just went on my first trip and put 280km on with a new Yamaha primary spring, new Yamaha 14.5mm primary rollers and a new 8jp belt. Checked clutch temp a lot and both clutches running very close temps to each other, but half way through trip (140ish km) felt it was acting funny. Had a broken primary spring and all 3 rollers had bushings that were completely trashed again. Belt looked good though so I feel like my alignment is good. Don’t know what to do other than sell the sled. In 3300km have went through numerous belts (guessing 8), 2 primary springs, 7 sets of primary rollers and replaced just the bushings a few times, secondary rollers flat spotted so now have hi torque rollers which have been good, etc, etc. It’s basically cost me $1/km in just clutch repair costs. Help, rest of sled has been awesome, and really enjoy it.
Sidewinder primary rollers.
- Thread starter old700
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- #3
Stock gearing. I will be trying an older clutch if I can’t get this figured. Sled is getting dropped off at dealer today, but is 3 weeks past warranty now. It was in at this dealer a month ago and Yamaha warrantied the stub shaft, primary rollers and gave me a new belt. There has to be something wrong to go through a set of roller bushings every 100-200 km. I put a brand new set in at the start of the day, trail into our zone is 40km long, so out of our 130km day, 80 of it is just on the trail. All 3 bushings sloppy and one working it’s way out and the roller stuck. Thank god I caught it so another weight never got destroyed. Frustrating to say the least.
06yamahaapex
Active VIP Member
What are you running for weights springs and helix
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- #5
Dalton QAY weights, Dalton black/bronze primary spring (have had 3 OEM primary springs break on me). Stock secondary helix 35*, stock spring. Always run at or as close to 8800rpm as possible.
climbmax
Team Thunderstruck
I also broke 2017 springs. Went to the 2018 spec and no issues. Maybe try that. As far as rollers going out......make sure you have the wide shims in there so the bushings can't move. If all else fails go back to OEM 8LR weights fully loaded. They work well.
Andrew.renegade1000
Active VIP Member
Climbmax what the part number for the 2018 spring!?
Lund
Active VIP Member
There are a number of OEM springs available for the sled but i believe the base spring that came with the 18 MTX 50th anny, is 90501-510A0-00, its a SL-OR-SL.
Andrew.renegade1000
Active VIP Member
Perfect thanks! I am running the 8LR weights loaded up as per your recommendations and the stock primary spring, I do have a spare spring to, but if I break another one I’d be interested to try the 18 spring! Thank you again sir!
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- #10
Are there additional shims besides the thick black ones on each side of the roller? Also what twist would you recommend to try in the secondary with stock spring & helix? I seem to be getting good clutch temps at 6-2.
Andrew.renegade1000
Active VIP Member
I’m running 3-3 60 degrees of twist, as per lunds recommendations and it seems to work great!!!!
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Lund
Active VIP Member
I have read your post's and WOW.
I have had over a dozen SW come through my shop and NON have experience your issues. Certainly would love to have yours come here so to check it out.
Either way, red flags for me was machining the secondary. That should had come to full stop and further diagnoses to the going on.
The PTO shaft slipping back is also odd, as the bearing's slip's on the PTO shaft which is shouldered. The inner bearing is "pin" in the case(engine block) and the PTO shaft once in place shoulders against it.
As for the Dalton weights, i have heard of guys having clutch issues with them, reason why i only run Yamaha weights.
To me it sounds like your sled has a compound of issues that were actually created.
Hope you figure it out.
I have had over a dozen SW come through my shop and NON have experience your issues. Certainly would love to have yours come here so to check it out.
Either way, red flags for me was machining the secondary. That should had come to full stop and further diagnoses to the going on.
The PTO shaft slipping back is also odd, as the bearing's slip's on the PTO shaft which is shouldered. The inner bearing is "pin" in the case(engine block) and the PTO shaft once in place shoulders against it.
As for the Dalton weights, i have heard of guys having clutch issues with them, reason why i only run Yamaha weights.
To me it sounds like your sled has a compound of issues that were actually created.
Hope you figure it out.
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- #14
If this round ends up failing, I will defiantly take it to you. My dealer called me today and said Yamaha says to run the rollers with the duralon bushings, they hold up better than the stock ones. The primary spring breaking may have just been chit luck. The primary has no wear on it and the rest of setup is good. The sled has always ran and pulled good but kills bushings in the rollers. I also picked up a good Apex primary today so will try it if needed. Have it setup with a Blu white blue and DTYA’s. This worked in the Nytros running the MCX 240-270 so hopefully it will be a close start point.
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- #15
Put on 130km yesterday with a fresh set of primary rollers with the duralon bushings (as recommended by Yamaha). Mechanics went through my primary again prior and found no problems yet again. I.D of the bushing went from 8.99mm to 9.07 in 2 rollers and to 9.2mm in one. All roller pins measure 8.94mm as new. I guess the Apex clutch I picked up is getting put on. Clutch temps are within 20*, belt looks good so I know it’s not a setup issue.
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