9R clutching

[Fat_Tones]

Does the 9R gain rpm when it comes out of break-in? My Boost didn't gain rpm, but my 800 gained like 250 once out of break-in. My should be done with break-in on the next ride and I'm revving 8600rpm @ 6500ft. Trying to decide between just swapping in a 120/320 primary spring, buying Polaris 74g or 76g weights, or going with the Bikeman stage 1 kit...

 

[Ultrasauras]

Spring is the cheapest route.

 

[Fat_Tones]

Spring is the cheapest route.

It also helps that I have a new spring lying around. Might go that route for now, since we are leaving for BC again in a few days.

 

[kanedog]

What is the spring specs?

 

[Fat_Tones]

What is the spring specs?

120/320

 

[kanedog]

What is the current spring?

 

[Fat_Tones]

140/330

 

[Fat_Tones]

I wonder if the 120-320 spring will lower the engagement rpm too much? I see SLP sells a 140-320 spring. A tech I spoke with has had really good results with the Bikeman stage 1 kit on his personal 9R after 2000km. Ibexx makes a nice kit, but expensive and includes a helix, which I'm not sure why, unless it's intended to replace the low elevation helix. I was under the impression the Polaris high elevation helix is good. I'm a little hesitant now with Ibexx since my Boost helix was incorrectly cut. Ibexx warrantied a new helix, but it doesn't inspire confidence for me to run out and buy another kit.

 

[kanedog]

Engagement will be smoother with the 120/320 but you wont see much difference in rpm up high. Maybe try a 120/290. For fine tuning, a spacer underneath the spring adds 50rpm.

 

[Klutch]

I'll throw in here for what it's worth, running a 9r 146, ran stock high elevation clutching last year. Decided to go with only changing to boondocker talon weights. Pretyy happy with resutls. Seems zippier and holds rpm better. Not sure they would make a difference on backshifting but that was better this year too.

 

[Reddragon800]

Anyone looking for 9R clutching for 5-7000' and a 7-9000' kit. I have what your looking for. I use EPI weights, venom springs and venom cuts my angles. Loads the sled like a big bore should be. Have been testing all over Revelstoke. Check out my instagram and facebook accounts. SRP.

I have found that the 56-42.36 is too much helix and gone to shallower angles and more primary weight. Makes more tracks speed, backshifts way better and holds rpm at 8400.

 

[Fat_Tones]

Anyone looking for 9R clutching for 5-7000' and a 7-9000' kit. I have what your looking for. I use EPI weights, venom springs and venom cuts my angles. Loads the sled like a big bore should be. Have been testing all over Revelstoke. Check out my instagram and facebook accounts. SRP.

I have found that the 56-42.36 is too much helix and gone to shallower angles and more primary weight. Makes more tracks speed, backshifts way better and holds rpm at 8400.

I just seen Bryce's video with the tune and clutching you did on his Boost. He definitely looks happy with it.

 

[Reddragon800]

I just seen Bryce's video with the tune and clutching you did on his Boost. He definitely looks happy with it.

Ya. Those 14 series weights just dont work for the boost. Check out, gmanfreeman300 on instgram. His 9R flies.

To add to what Bryce was saying, You get a ton of value with this set up. Some competitors are charging almost $2000 Canadian or more for a clutch kit, tune and programmer. I charge under $1200... installed. Sled works so much better, makes more power, better bottom end and response.

 

[Fat_Tones]

yesterday mine was hitting 8400-8500 at 8500ft. 2 feet of fresh, snow (not blower), on top of thick dense "sierra cement"
100% stock clutching.

aligned my clutches last night, added proper float to the secondary. it had 0 from the factory

What is the proper float spec? I had my clutches off to have balanced. When I put the secondary back on I have 0.015” float and I’m looking everywhere in the garage thinking I lost one of the washers that goes on the bolt…lol.

 

[Fat_Tones]

Re-measured and my 9R secondary has 0.018” float and wife’s 850 has 0.027”.

On my last trip to the mountains I picked up some 14-74 weights from a dealer. Riding with the stock 140/330 spring at 6500ft in above freezing temps I was revving 8500 on my 165. So next day very similar conditions went to a 120-320 spring and was seeing 8450. However the new 74g weights made the sled nearly unrideable to me due to excess vibration in the bars between 5000-6000rpm. Polaris must balance the clutch fully assembled because the 74g’s weighed similar to each other, but it turns out one of the original 72g weights weighed a gram more than the other two, and the sled was pretty smooth with those weights in there.

Ibexx kits were on for 15% off so I decided to go that route, since I’ve been hearing pretty good things the last couple years about Ibexx on the 9R. The Ibexx weights loaded for my altitude weigh dead on 59.30 grams. I guess they use a different weight profile and helix angle to load the sled, so I’m really curious to see what lightening up the primary clutch that much does for the response. I ran the sled up on the stand and engagement is around 3750 rpm. I installed the kit and then had the primary rebalanced fully assembled at an engine shop. I doubt I’ll get a chance to ride it this year, unless snow conditions change in BC.










Trying out this bearing under the gold cup that is supposed to make shifts smoother. Also put two slip washers behind the primary spring.