My 900 vs 2006 Yamaha Apex

[chunkysoup]

I think the rev limiter is 8050, although my max rpm shows 12,000! lol

Mine reads 12000 from time to time as well and now its been reading 9900! Y is that? Never hit a rev limiter and before this forum at one point my sled ran about 8100-8150!

 

[sno_mo_racer]

7400 RPM is the peak torque spot for the 900 motor, so anywhere right in or just above that range is perfect.

I haven't done a whole lot of climbing with my sled this year due to the crummy snow conditions, but I seem to be pulling about 7500 on the good climbs and it pulls nicely at that. Just as a reference, my clutching is BONE STOCK and it pulls great; Black/green primary spring, 10-72 weights, and stock helix in the secondary nothing special, but it seems to work great for me.

As to the Rev Limiter, I am not sure exactly when it kicks in, but I believe it is pretty high, Max recall on my gauge has shown 7850 RPM and I have never hit a limiter.

Sorry for the question but how can you tell when you hit the limiter?

 

[Jmanwillis]

It will cut out acting like it is missing till you drop below the set point.

 

[Doctor D]

Thank guys for the gearing info. Just what I needed, we ride in Colorado between 10,500 and 12,500 feet. Does anybody have any ideas on the gas gauge problems? Not to get off the clutch and engine talk but when I switched to the Fox Floats on the front my machine it really came alive in the bumps, jumps and turns.

 

[IF900RMK]

Hey guys I haven't forgot about this thread, I just finally got to do some riding in the last couple weeks. Here are the pics of the clutch you can see the deep black marks toward the center then you can see there is about a half inch of clutch on the outside that isn't getting used, but that might be as far out as the clutches can go..... Let me know what you guys think.

 

[Z-Man]

Heavier spring in your secondary may help some with this. Did you wash that belt prior to putting it on the sled? If not, pull the belt scrub it using dish soap and let it dry. Clean your clutches of any residue before reinstalling the belt.

 

[sno_mo_racer]

Hey guys I haven't forgot about this thread, I just finally got to do some riding in the last couple weeks. Here are the pics of the clutch you can see the deep black marks toward the center then you can see there is about a half inch of clutch on the outside that isn't getting used, but that might be as far out as the clutches can go..... Let me know what you guys think.

On the bold. You aren't fully shifting out looks like as the outside isn't getting used. Might be the clutch. Take off sled then take the spring out. Once out then take the belt and fully close the clutch and check with the belt see if it seats inside right at the outer side. If it isn't all the way out to the edge then you will need to take clutch apart and adjust it till it can fully shift out. While apart make sure belt sheave clearance is around .020" when belt is in neutral furthest in by adding/subtracting shims between the spider and sheave.

Heavier spring in your secondary may help some with this. Did you wash that belt prior to putting it on the sled? If not, pull the belt scrub it using dish soap and let it dry. Clean your clutches of any residue before reinstalling the belt.

So if there is a black mark on the inner shave of primary then a heavier secondary spring will help the slippage on the take-off?

 

[Z-Man]

So if there is a black mark on the inner shave of primary then a heavier secondary spring will help the slippage on the take-off?

No, washing your belt before you install it and cleaning the gunk that came off your belt that is now on the clutches will help.

Heavier secondary spring may help his track speed while climbing and if the belt is slipping high up on the clutch. It won't help if the primary is sticking and not shifting out.

 

[dktraw]

sorry to jack this post, but reading all your specs on rpm and track speeds, mine sounds really high. it is an 06 900 159, with slp exhaust, carls clutching, slp intake, torque arm all that stuff. any ways, i pull steady 8000 rpms up deep steep climbs, with a 62mph track speed. i have hit 8200 while climbing. it runs really well, and hi-marks great(beat an 09 rev xp 163). anyways what do you guys think.

 

[sno_mo_racer]

No, washing your belt before you install it and cleaning the gunk that came off your belt that is now on the clutches will help.

Heavier secondary spring may help his track speed while climbing and if the belt is slipping high up on the clutch. It won't help if the primary is sticking and not shifting out.

OK, was just wondering why sometimes I would get that black mark on the inside of the sheave when belt starts to engage. Washed when first installed belt but I guess a good idea to wash belt once in a while also.

 

[Z-Man]

OK, was just wondering why sometimes I would get that black mark on the inside of the sheave when belt starts to engage. Washed when first installed belt but I guess a good idea to wash belt once in a while also.

Somebody had a post about that saying to wash it every so many miles. I get it on my sled to with the 1115 belt. It's probably a good idea to wash the belt and clean your clutches when you see that rubber building up on the bottom.

 

[sno_mo_racer]

Somebody had a post about that saying to wash it every so many miles. I get it on my sled to with the 1115 belt. It's probably a good idea to wash the belt and clean your clutches when you see that rubber building up on the bottom.

OK thanks, will do. I guess I missed that post. I am getting that black mark on the inside also but not that black. Just a bit to notice.