Spin balancing clutches
- Thread starter renegade
- Start date
Indy Dan in Shakopee MN if it's a poo. Otherwise I'd ship it to slp, you would have it back before there was any snow.
Dan's #651-338-9045. Lot of guys just spin balance whatever you brought in, bad bushings & all with no consideration for belt to sheve clearance, this all has to be top notch first with Indy Dan. He's usually about 125.00 for a balance & worth all of it! I've had brand new take offs brought to him that were in excess 2 grams off with a belt clearance .40 worth of slop, yes right from the factory.
Dan's #651-338-9045. Lot of guys just spin balance whatever you brought in, bad bushings & all with no consideration for belt to sheve clearance, this all has to be top notch first with Indy Dan. He's usually about 125.00 for a balance & worth all of it! I've had brand new take offs brought to him that were in excess 2 grams off with a belt clearance .40 worth of slop, yes right from the factory.
winter_time
New member
you can have it done at dollarbay motorsports in Dollar Bay Michigan. The do pretty good work and are reasonable.
D.B. Cooper
Member
I had that done on several sleds, DEFINITELY worth doing.
If you're trying to diagnose a vibration problem, remove the primary and GENTLY run the engine to see if the vibration is still there.
I had a 2001 EDGE 800 here, the recoil housing was cracked, bent, leaving the water pump oil pump drive partially dis-engaged, that was the source of the vibration.
As mentioned in the above post, check the crank run-out.
.0025" is the absolute most I would want to see.
Measure it approx 1" IN from the end of the crank snout
Fairly certain the vibration is from the secondary, considering I had it apart last year and in my haste forgot to mark it. But I will check. I do believe it wil be worth it after all the info I've been reading about it, and finding out doos tolerances in clutch balancing are the worst of the manufacturers. I'm looking forward to seeing the differance.
D.B. Cooper
Member
X2^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
indy_500
Well-known member
If you have excess vibration from the secondary area your jackshaft bearing is probably shot. Secondaries are normally VERY far off from being balanced, but are nowhere near as critical as primarys when it comes to vibration. xcr1250 normally drills 15+ holes to balance a secondary.
Then you change the preload and its out of balance.
I would not recommend this on a two stroke (with carbs);especially on a hot engine---two stroke runaway!!!!!!!
Last edited:
D.B. Cooper
Member
I do it all the time.
Notice the word GENTLY in the recommendation.
What does carbs vs. E.F.I. and hot engine have to do with it and how does having the primary on change things in those circumstances?
D.B. Cooper
Member
I think you mean the belt-to-sheave???
If so, mark the halves of the primary , then upon re-assesmbly with different shims, rotate the spyder to a different position in order to get the sheaves to line up +/- 1" from your original marks
L
lenny
Guest
crank snout,,, that's funny
Not directed towards you, but others that see your post. Carb vs EFI. Carbs have a fuel bowl that an unloaded hot engine (no belt on) will pull from EVEN WITH THE SWITCH OFF. Amazing how long a 1000cc 2-smoke will scream at 8000+ rpm with the switch off and the fuel shut off. With EFI, you have an electric fuel pump that provides fuel, turn the switch off, no fuel. That is how a diesel shuts down, no fuel. A run-away 2 stroke is basically dieseling. Hot pipes aid in pulling the fuel. About the only thing you can do is pull the choke so the fuel mixture is not so lean.
Google runaway 2 stroke
The sheave halves on a secondary move opposite directions (simplified) as the belt gets pulled into it. So balanced at one RPM doesn't mean it is balanced at another.
I think without the primary, less likely to happen, I think. Because the primary will act as a flywheel to force through the compression.