Acceptable crank runout?

BoonDoX · Oct 19, 2008

I checked mine at the pto with the primary off, and I am getting about .004 of runout, near the chamfer. The end is a little scored as the primary came loose and spun on there a bit, but its not too bad. This is on an 05 900 rmk. Thanks. Josh

RMKcowboy · Oct 19, 2008

I think you're looking at a new crank, seems like 0.002 to 0.003 is the max on runout IIRC.

POLZIN · Oct 19, 2008

yep! you should have that fixed!

Lake Cle Elum · Oct 19, 2008

Cowboy is correct on what is recommended. I was on the phone with a shop that does a lot of cranks and posts here on a frequent basis. When I mentioned my friends crank was at .0047 on the PTO end, his comment was: You're in that grey area.......

After some discussion, my friend is going to get his clutch balanced and kinda baby it one more year as it's getting kinda late to tear into it now.......Certainly, you're in an area to be concerned...

AdrenalineAddict · Oct 19, 2008

Don't simply drop in a new trued crank. Most cranks that are that far out of true have out of tolerances cases. Simply dropping a fresh crank in out of tolerance cases won't accomplish a thing.

BoonDoX · Oct 19, 2008

Alright, I think I will run it until it goes bang, then buy one of indydans bottom ends. Thanks.

sled_guy · Oct 19, 2008

Service limit according to Polaris is .0045"... needs to be fixed at that point. I NEVER wait that long.

I doubt if you'll ever see .007" of it... it will break before then.

sled_guy

Ron · Oct 19, 2008

BoonDoX said:
Alright, I think I will run it until it goes bang, then buy one of indydans bottom ends. Thanks.

Could cost you lots more-cases aren't cheap!

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Acceptable crank runout?

BoonDoX

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RMKcowboy

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POLZIN

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Lake Cle Elum

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AdrenalineAddict

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BoonDoX

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sled_guy

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Ron

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