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2001 XCSP 600 bogging until 5000 RPM

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  #1  
Old 01-29-2012
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Rubi
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Default 2001 XCSP 600 bogging until 5000 RPM

Gerbil's new sled wasn't running up to snuff on our first test and tune ride. It was a real dog at engagement up until 5,000 RPM. It would accelerate slowly up to 5K, then after a few seconds of being slow and crappy it would just take off on the top end like a Sasquatch was chasing it! Not a very good setup for a boonditching sled. Gerbil managed to get stuck three times in 25 miles, and we don't really have any snow! A sled that bogs on takeoff so you have no groundspeed and then unexpectedly revs hard enough to trench you to China is a real bad combination.

DCUBA doesn't know much about clutching. You'd probably have better luck hiring a wizard to cast a spell on your clutches than having us tune them, but we attempted a fix anyway.

Gerbil said his secondary was surprisingly easy to twist for belt removal, so we decided to start there. Our amateur logic was that if the secondary was soft, the sled would shift up too quickly causing the bog. Also, the secondary is the easiest to remove so we wanted to try that first. We took the clutch off and dissembled it using my awesome woodworking clamp clutch tools. The spring was in hole #1, the helix had weird wear on one ramp, and the super unslippery buttons didn't look too great. Gerbil shined everything up and I sprayed lots of my favorite graphite drylube all over everything except the sheaves. We put the spring in hole #3 and reassembled.

Today was test and tune volume II, and we hit the proving grounds with bated breath. What was the result? Same bog, the sled seemed to hang at 5,000 for a few seconds before taking off, and now the sled over-revved by 300 RPM. Great. Exactly what's supposed to happen when you move the secondary spring two holes.

I noticed that the sled was engaging at 2,800 to 3,000 RPM. Gerbil said he thought it was 3,500 RPM, but we agreed to disagree. Even at 3,500 it seemed a little low since I think mine engages pretty close to 4,000. Our pea brains started spinning and we came to the conclusion that only the primary clutch has anything to do with engagement, so we took that off.

In my past experiences, logic has absolutely nothing to do with troubleshooting a piece-of-shit sled, so we weren't confident we'd find the problem in the primary, but we did have hope. We popped the cover off the primary and what did we find? Looked a lot like a broken primary spring:

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Well, even a blind squirrel finds a nut now and then! We threw a spring from my boonditcher pro in there, and we'll head to the proving grounds to test it tomorrow. Anyone care to predict the outcome? DCUBA says it's gonna rock!

Here's a bonus picture I just ran across on my camera. DCUBA doesn't know clutching, but we DO know getting stuck!

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Last edited by Rubi : 01-29-2012 at 11:43 PM.
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  #2  
Old 01-30-2012
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I'm going to take a shot that the cover plate and moveable sheve bushings are worn and binding the shaft. Bushings would have to be really worn out to break springs. get a chance to look at the rollers and pins. it looks like you have the right spring, dark,blue/white and it should have 10/58 weights, for that matter I believe they all did . Can you get access to a scale for weighting fish (hook on one end ) to see just how much tention you have on the driven. either way your right binding in the drive. I am bringing a few things with me for clutching, oh hell I guess the only things I wasn't going to bring was the base and spider tool. I'll be checking this thread till Thursday early A.M. to see what's up.
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  #3  
Old 01-30-2012
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sounding like you guys should bring every part and tool you have so at the end of the week you can all ride good sleds!
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  #4  
Old 01-30-2012
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Quote:
Originally Posted by blue avenger View Post
sounding like you guys should bring every part and tool you have so at the end of the week you can all ride good sleds!
I usually do, the key thing to remember Greg is.. I ride an Ultra. 26 miles on a complete build. I have it set up on the fat side (bottom and top end) so much so Ive renamed it "The Valdez"
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  #5  
Old 01-30-2012
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Clutch tools are a must-have on the group ride.

Speaking of which, Rubi are you bringing my 10-66s back?
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Old 01-30-2012
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Speaking of clutch parts and tools..... Harry, do you still have my clutch puller? I looked for it this weekend and I don't have it, I believe you borrowed it last?
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  #7  
Old 01-30-2012
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Hell off time to start pulling one apart ...lol I can see it now half tuned up bolting the base to the kitchen table, breaker bar with a 5ft pipe reefing on the lock nut or spider. I'm only bring my puller and spring depresser.
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  #8  
Old 01-30-2012
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Quote:
Originally Posted by Ibreakstuff View Post
Clutch tools are a must-have on the group ride.

Speaking of which, Rubi are you bringing my 10-66s back?
Yeah, I know where they are, and I'll put them in my toolbox today so I don't forget them.
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  #9  
Old 01-30-2012
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put them with boost bottle ha
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Old 01-30-2012
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Quote:
Originally Posted by Gotmud View Post
Speaking of clutch parts and tools..... Harry, do you still have my clutch puller? I looked for it this weekend and I don't have it, I believe you borrowed it last?
I'll have my puller.

Quote:
Originally Posted by Ultra Willie View Post
Hell off time to start pulling one apart ...lol I can see it now half tuned up bolting the base to the kitchen table, breaker bar with a 5ft pipe reefing on the lock nut or spider. I'm only bring my puller and spring depresser.
Good, then I'll leave my depresser at home. Whew.

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Yeah, I know where they are, and I'll put them in my toolbox today so I don't forget them.
Thanks.
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  #11  
Old 01-30-2012
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The xc is back together and the new spring seems to have taken care of the low engagement problem and the bog so I should be good to go. Even got the trail sticker off of the rmk in one piece so I don't need a new one of those.
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Old 02-01-2012
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Quote:
Originally Posted by Gotmud View Post
Speaking of clutch parts and tools..... Harry, do you still have my clutch puller? I looked for it this weekend and I don't have it, I believe you borrowed it last?
Yes....

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