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paleobikes
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ohio
Joined: 06/14/2010
Posts: 15

I have a r71 motor that I have been putting together. Does anyone have the correct procedure for timing? It has no marks I can find on the flywheel so I am guessing at where TDC is by looking at the piston position. It seems that assuming the gears were in the correct position that the distributor housing can only be installed one way. The things I have read in the stock manuals seem pretty generic and assume that the distributor is in the position it was in from the factory. I figure I can set the timing no problem providing I can rule out any errors on reassembly. To me it looks pretty straight forward, but I am trying to rule out any problems.

Bruce Frey
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VBMWMO #6316
Texas Hill Country, USA
Joined: 10/27/2006
Posts: 574
There are alignment marks on

There are alignment marks on the cam and crank gears.

See the attched pdf.

Bruce

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r51-71_handbuch_cam.pdf168.53 KB
Bruce Frey
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VBMWMO #6316
Texas Hill Country, USA
Joined: 10/27/2006
Posts: 574
I re-read your post and am

I re-read your post and am not sure if you ar refering to cam timing or ignition timing. There is only one way the distributor can go back together. As long as the cam timing is OK, it should work. In theory, the points should open when the piston is 12mm below TDC. There is a diagram of the timing in the R5-R6 Handbuch that is not in the R51-R71 Handbuch. Point gap is 0.4mm to 0.5mm. I don't have a scan of the R5-R6 page with the timing, but I can do it if you need it.

Bruce

Bruce Frey
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VBMWMO #6316
Texas Hill Country, USA
Joined: 10/27/2006
Posts: 574
OOPS....12mm BTDC is for the

OOPS....12mm BTDC is for the R5. 5mm BTDC is for the R6.

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