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Author Topic: apache clutch spring  (Read 6422 times)

Offline smoker

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apache clutch spring
« on: January 02, 2011, 10:17:26 am »
I have a 292 and I think after many years the spring in the primary needs help. I was wondering what people are replacing them with, mine engages right above idle. The engine is a 72 with a spline clutch.
If you can't wrap it around a tree whats the point!

Offline WildOne

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Re: apache clutch spring
« Reply #1 on: January 02, 2011, 01:15:14 pm »
Is there a number on the clutch? I have NOS part numbers that can be converted, but I would need a number off the clutch. Yamaha engine?
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Offline smoker

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Re: apache clutch spring
« Reply #2 on: January 02, 2011, 01:25:07 pm »
Yes it is a yamaha 292 1972 Apache spline clutch . I looked and cant seem to see any numbers
If you can't wrap it around a tree whats the point!

Offline WildOne

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Re: apache clutch spring
« Reply #3 on: January 02, 2011, 01:28:41 pm »
OK. I will have a peek.
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Offline smoker

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Re: apache clutch spring
« Reply #4 on: January 02, 2011, 01:34:50 pm »
Thankyou
If you can't wrap it around a tree whats the point!

Offline WildOne

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Re: apache clutch spring
« Reply #5 on: January 02, 2011, 02:30:45 pm »
It will be one of these two Yamaha part numbers:
90501-45160-00
or
90501-45161-00

Looks like a very generic Yamaha part as both of these are now sold as the same part number.

If you call Babbit's at (231) 737-4542 they will be able to sell you the part, or tell you the number of an aftermarket part. I would think that any place like Recreation Supply Co. or Agri Sports would have the same info for you as well. When you get the aftermarket part number please post it here so that we all know.
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Offline _FIII

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Re: apache clutch spring
« Reply #6 on: January 02, 2011, 09:59:20 pm »
smoker, what I did on my son's 1972 Apache 292 was changed the spring and did some custom grinding on the weights.  I am still using the stock splined clutch.  I am using a yellow skidoo spring from a square drive clutch from the 70's and early 80's.  The spring is the correct length but about 1/16 of an inch too large in diameter to fir inside the clutch.  I just ground down the outside diameter with a 80 grit paper disc on an angle grinder.  Then on the clutch cover I ground down the backside of the tip of the kidney weights a bit at a time and then test.  The spring got my engagement up to where I wanted and my top end was a bit low so I hade to remove weight to get my RPM's up only because I race ported the motor and it needed more RPM.  Spinning right around 8000rpm if I remeber correct.  Mine will do 48mph in 500ft on grass with my 240lb frame on it.

I do know a guy with NOS stock springs for the 292 if you want one?  I have my original one too that is no good to me.
Richard

Regina, SK

www.sasksnowmobile.com

Offline smoker

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Re: apache clutch spring
« Reply #7 on: January 03, 2011, 03:47:05 pm »
Thanks for all the help guys. I rummaged around a friend of mines shop and luck would have I found a spring  that had the right part number we hope the last part of the number was missing on the tag. I looked in the back of a old snowmobile clymer manual and it had a speed tuning section and it talked about grinding the kidney weights in the primary. One way for shift  and another way for engagement . Now I must resist the temptation of grinding to much. FIII did you remove the weights for grinding or did you do it with them still attached to the cap. 
If you can't wrap it around a tree whats the point!

Offline _FIII

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Re: apache clutch spring
« Reply #8 on: January 03, 2011, 08:49:09 pm »
I did it with them still attached on a bench grinder.
Richard

Regina, SK

www.sasksnowmobile.com

Offline smoker

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Re: apache clutch spring
« Reply #9 on: January 23, 2011, 07:41:31 pm »
Thanks for the help .The clutching was coming along nicely and then my exhaust completely disassembled its self. Oh well next weeks project by the way I had to grind off way more than I thought on the clutch weights.
If you can't wrap it around a tree whats the point!

Offline _FIII

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Re: apache clutch spring
« Reply #10 on: January 23, 2011, 08:18:12 pm »
Yeah I know :o

I had to take off about 3/8" off the tip to get it to rev out where I wanted.


I will be doing more on Friday because the head got cut down some more so it is C-114 race gas from now on but should be fun on the track ;D
Richard

Regina, SK

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Offline smoker

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Re: apache clutch spring
« Reply #11 on: January 23, 2011, 09:35:31 pm »
I'm guessing at about 1/4 " now and a little more on the secondary and I should be good. After i find a muffler or maybe even a trail pipe if there is such a animal we'll be back on the snow.
If you can't wrap it around a tree whats the point!

Offline _FIII

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Re: apache clutch spring
« Reply #12 on: January 24, 2011, 07:19:28 am »
smoker, are you gonig to be at the race in moose jaw this weekend? 
Richard

Regina, SK

www.sasksnowmobile.com

Offline smoker

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Re: apache clutch spring
« Reply #13 on: January 24, 2011, 06:06:39 pm »
I can't make it, I'm mom this weekend my wife is working.I will have to stay in my garage and create a exhaust system out of my left over muffler pieces. And that kiehin is starting to drive me I'm just about ready for a mikuni screw original. I have plans to make it to nipawin -40 or +40 snow drag or grass drag don't matter  .
If you can't wrap it around a tree whats the point!

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