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Old 01-10-2011, 09:05 AM   #16
supershaft
because I can
 
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,275
Quote:
Originally Posted by bmwrench View Post
Unless you need to pull the crankshaft for bearing inspection and/or replacement, I would simply get the rods and pistons balanced. This almost always results in less vibration. Install some lightweight wristpins while you're at it.

Balancing the flywheel and clutch-particularly in '81 on motors is also worthwhile.
I am curious to why you say that about late model setups. I have balanced about five or seven of them and they were all spot on as is.
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Old 01-10-2011, 06:50 PM   #17
bmwrench
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I've never seen any (that I checked) that were correctly balanced. Go figger.
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Old 01-10-2011, 08:07 PM   #18
supershaft
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Location: San Francisco Bay area
Oddometer: 8,275
Sometimes I think we are on a different planet.

All five or seven of mine were perfect no matter how you lined up the paint marks not that you get any of them even close to 120 degrees apart.
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Old 01-11-2011, 05:19 AM   #19
Martian OP
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Location: Elmdale, Kansas, USA
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Now that we've moved on to flywheel/clutch unit balancing, I do have some experience. When changing all the clutch parts on the GSPD, I ran a rope thru the center of the flywheel, stacked the clutch parts, and hung them from the rope. It took a few tries, but eventually, I got them arranged where they hung perfectly level. The bike seemed smoother than before, but I don't have any way to prove it .
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