To phase, or not phase a drivesahft - BMW Luxury Touring Community
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post #1 of 7 Old Feb 14th, 2019, 1:12 pm Thread Starter
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To phase, or not phase a driveshaft

So, putting the finishing touches on my new FD pivot bearings and ready to install. I've seen references to phasing the front and rear U-joints, but most everything I come across shows doesn't really matter. Various Youtube videos show mechanics just shoving the FD on with no worries about alignment. Other online articles mention nothing. The BMW Service and Clymer manuals don't mention it. I'm fairly new to the forum and I'm betting this is a slam dunk for you seasoned LT owners. So, is it urban myth or for real?

Bob Johnson
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1973 R75/5

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post #2 of 7 Old Feb 14th, 2019, 1:41 pm
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Re: To phase, or not phase a drivesahft

I don't have a K bike, but an R bike. Also, I have a bunch of vintage cars and other "old iron" (farm implements) with drive shafts. If you are ever removing a drive shaft and think to mark the "phase," I would call that good practice. I have done it both ways. On some, it didn't matter, which means the assembly was well balanced. However, if the assembly is "phase sensitive"...it will matter a lot! The only way to find out is to get it wrong. One of the life lessons you try to remember not to repeat.

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post #3 of 7 Old Feb 14th, 2019, 1:46 pm
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Re: To phase, or not phase a drivesahft

Quote:
Originally Posted by Bob.K1200LT View Post
So, putting the finishing touches on my new FD pivot bearings and ready to install. I've seen references to phasing the front and rear U-joints, but most everything I come across shows doesn't really matter. Various Youtube videos show mechanics just shoving the FD on with no worries about alignment. Other online articles mention nothing. The BMW Service and Clymer manuals don't mention it. I'm fairly new to the forum and I'm betting this is a slam dunk for you seasoned LT owners. So, is it urban myth or for real?
Chances are you will not notice a difference if you don't phase but I'm not interested in taking that chance as it is not that much more trouble to phase so that I don't have to face what phase could have prevented.

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post #4 of 7 Old Feb 14th, 2019, 1:55 pm Thread Starter
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Re: To phase, or not phase a drivesahft

Agreed,..couldn't hurt. I noted the orientation on removal and the tranny hasn't moved so pretty sure I can get back as before,..but I'm third owner so that may or not be phased. With a strong enough flashlight can you see the front U-joint from the opening in the swingarm?

Is the attached (not from a K bike) a properly phased shaft that represents the basic principle?
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Bob Johnson
Knoxville TN
2004 K1200LT
1973 R75/5

Last edited by Bob.K1200LT; Feb 14th, 2019 at 2:01 pm.
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post #5 of 7 Old Feb 14th, 2019, 3:07 pm
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Re: To phase, or not phase a drivesahft

Quote:
Originally Posted by Bob.K1200LT View Post
So, putting the finishing touches on my new FD pivot bearings and ready to install. I've seen references to phasing the front and rear U-joints, but most everything I come across shows doesn't really matter. Various Youtube videos show mechanics just shoving the FD on with no worries about alignment. Other online articles mention nothing. The BMW Service and Clymer manuals don't mention it. I'm fairly new to the forum and I'm betting this is a slam dunk for you seasoned LT owners. So, is it urban myth or for real?
Although not mentioned anymore in most BMW ParaLever shop-manuals , it is always good practice to phase the U-joints of these drive-shafts.

See this very good post with photos posted in 2012 from SADDLEMAN (Dave) - many tips how to do this on K1200LT precisely without guessing:
http://www.bmwlt.com/forums/k1200lt/...tion-tips.html
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post #6 of 7 Old Feb 14th, 2019, 3:50 pm
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Re: To phase, or not phase a drivesahft

I think phasing is important, things can get stressed with out it. Here is an good demo of what goes on with a drive shaft.
I don't think our bikes are as extreme but...
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post #7 of 7 Old Feb 14th, 2019, 4:07 pm
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Re: To phase, or not phase a drivesahft

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I think phasing is important, things can get stressed with out it. Here is an good demo of what goes on with a drive shaft.
I don't think our bikes are as extreme but...
That is an excellent video showing exactly why you need to phase your drive shaft. Thank you.

Gordon
Sugar Hill, GA
2001 K1200LTI Champagne (current ride) Lazy Susan
1998 R1100RT Never should have sold it
1974 Yamaha TX 750 Twin. Omni Phase Balanced


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