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Old 12-23-2011, 04:45 AM   #12
WFO for 41 years
concours's Avatar
Joined: Dec 2008
Location: Kensington, NH USA
Oddometer: 5,431
Originally Posted by bmwrench View Post
marksb'ville's memory is right, and mine was wrong. One summer in the late '70s, it seemed like all I did was rebuild unit 650/750 motors-or more accurately, replace crank bearings. Not only did we leave the gearbox internals in place, we also lefft the cam gears on.

If it hasn't been mentioned already, pull and clean the sludge trap. and repalce the rod bolts.

Wherever you are Dad, thank you.

...and be careful the rod bolts you get aren't Chinese rubbish. +1 on the sludge trap... this one was 50% blocked, but only had 100,000 miles on it, yes, that's right. My buddie and I rebuilt it last in 1980, he rode it cross country 3 times and everywhere else. Top end was wheezing, so we pulled it back down, sludge trap was the whole reason we opened the bottom.

Too much is just barely enough.....

concours screwed with this post 12-23-2011 at 06:15 AM
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