Vintage Dirt Bike Q & A

Seem to have alot of wiggle in my counter sprocket after install, sprocket looks fine, probably alot of wear on the shaft. I really dont want to split the case and replace the shaft at this point, unless my crank seals are bad. Anyone ever delt with this?

Honda drive sprockets, the ones with the two screws and retaining ring, are designed to move a bit. Unless your shaft splines are very worn, this is not a problem.
dean (Honda mechanic in the 70's)

Thanks alot for the reply

But not too much. I ran into the same problem when restoring my
73 CR250. The first test fit with a good, but used CS sprocket
produced quite a bit of slop. I found a NOS CS sprocket and that
reduced the slop a little. Then I found a NOS countershaft and
now it's a nice tight fit with no movement.

IMO, the culprit here is the countershaft itself and the two bolt design.
The two bolt design allows a rider to keep using a worn out CS sprocket
which, in turn, eventually wears out the countershaft due to the poor
strength of the alloy Honda used though out the transmission.

I recommend you purchase a repro or NOS CS sprocket and put it away
in case you're ever lucky enough to find a NOS countershaft.

In the mean time, that little bit of slop will get bigger and bigger every
time you put the bike in gear and experience that driveline snatch.

dogger

_________________
1973 CR250M
1979 CR250R
1993 CR250R
2008 CR500R
2009 CR250R

thanks alot for the info!