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Evo pinion refit
By
Dan r
This is the bad race in a 97 big twin. all 99
and older big twins are done the same way. 54 and older pans
have a race close to the same on the sprocket shaft side that is
lapped to size the same way.
This is a lap tool made by "eastern mc parts" along
with a new sprocket shaft bearing needed for alignment.
Insert the lap tool in the case through the sprocket shaft brg
and arbor. adj. lap to a no slack fit in the race.
Lightly coat the lap with compound (I use 220 grit) and turn the
crank. at the same time move the lap in and out of the race to
get an even finish and size all across the race.
After the lap turns free, remove the lap from the case and clean
it well. inspect for complete contact on the race, it should
have a velvet look across the total race, then measure.
 
Then measure the shaft and rollers you have.
Do the math to figure brg clearance. rollers are avl. in std
(.250") through +.001" sizes in .0002" steps to
change the clearance. I shoot for a loose fit of .0008"
total.
Fits just fine now.
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