Late clutch engagement

keneb · Nov 23, 2010

2003 600 HO summit ZX, THe clutch engages at around 5100-5200 rpm. according to the manual it should be at 4100. I had the clutch apart, cleaned everything, there was no unusual wear and everything is stock. Is there something i else should be looking for? (pulley spacing or alignment, etc...) everthing seems to work great once you're going, it just engages at a higher than normal RPM. Thanks again for all your help!

winter brew · Nov 23, 2010

Correct belt with correct belt deflection and not excessively worn??

keneb · Nov 29, 2010

the sled has correct new belt, pulley spacing is correct and set belt deflection properly, and still have a late engagement. though it did drop to about 4800-4900. I even tightened the belt enough to slow the idle down and cause a squeel but it didn't improve any more. Any other suggestions?
Thanks again for any help offered up.

winter brew · Nov 29, 2010

If the tach is accurate I would say something is worn and/or binding in the primary. Arms, rollers, main bushings excessively worn...???

keneb · Nov 29, 2010

ok, i will take it apart again and see what i can find, I don't know how accurate the tach actually is but i have an 03 800 and it works properly, engages at 3800 and is silky smooth all the way through. the wifes 600? not even close! revs way up and is rather abrupt. just difficult to keep a steady slower speed while driving, it's pretty jumpy. I try not to let her ride mine too much, or i may not get it back!

Dynamo^Joe · Nov 29, 2010

Check to see if you have the levers placed in the correct phase.
very easy to remove and then install upside down.

Devilmanak · Nov 30, 2010

Is it a new (to you) sled, or did it just start doing this?
Sounds like a Summit with high altitude clutching being ridden at sea level.

firecat99 · Nov 30, 2010

Devilmanak said:
Is it a new (to you) sled, or did it just start doing this?
Sounds like a Summit with high altitude clutching being ridden at sea level.

I think devilmanak is on the botton, i have a bunch of buddys that had those old summits and they all reved very high, they loved the launch and it pulled good all the way through also and ran them like that for years

keneb · Dec 1, 2010

I have taken the clutch apart again, the arms are in properly, and moving freely, all the rollers look good and move freely. it has the stock green/white spring, the ramps are the stock 417 ramps, no real wear showing at all. However i did notice that the roller pins are hollow and threaded on the inside, and there is nothing threaded into them. I see in the factory parts diagram the 600 HO summit calls for a "pressure screw" that should be in there?? I'm pretty new to this clutching stuff so i dodn't know if they should truly be there and what effect they have, though it would stand to reason they would effect the weight of the roller end of the arm, though i don't know how much. Thoughts?

Snow Duck · Dec 1, 2010

the threads in the pin are so you can add and take away weight ie in grams will change the rpm....how is the spring tension?? collapsed by chance! that would make a difference.

Snow Duck · Dec 1, 2010

read this thread it will help also... thanks joe
http://www.snowestonline.com/forum/showthread.php?t=233890

Dynamo^Joe · Dec 2, 2010

keneb said:
I have taken the clutch apart again, the arms are in properly, and moving freely, all the rollers look good and move freely. it has the stock green/white spring, the ramps are the stock 417 ramps

The primary spring task is to determine(s) 3 functions
1)engagement rpms (start of shifting)
2)engine rated rpms (during full throttle)
3)full shift rpms (end of shifting)

IF green/white reveals 5100-5200 engagement rpms
THEN lower the spring start force.
Green/White = 200/380
There is available 160/380 purple pink.
That should lower rpms at least by 300
I have no doubt that if you go to the 160 start force then your engagement will be down to a more managable 4600~4700

And if you want to mellow the engagement out and lower it more, then put a 412 ramp in it and go from there. I laid up a 412 vs 417 and shows how smooth the start of the 412 ramp is. The 417 has a slight little hump that will cause engagement to be higher with very light pinweight.

A little trick for lowering engagment on a spline clutch (Note: this is for seasoned tuners)

"pressure screw" = "setscrew"

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Late clutch engagement

keneb

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winter brew

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