Counterbalance and primary drive gears

[Anthony0327]

I had purchased a counterbalance that has the thicker gear on it than the 88-89. My question is that does it matter what primary drive gears I use, either the thinner 88-89 gears or do I need the thicker ones or does it even matter? Reason I ask Is I didn't even know there was a difference until recently and when I put my bottom end together I don't want to mess anything up. I was told from a builder earlier on that everything was interchange able from on year to the next.  The gears I have are the thinner style. Please advise. Thanks

[Pumashine]

The thinner ones clear the basket easier. The new cranks are designed for the thinner ones. Just make sure it is secured by the bolt and washer without slipping.

[Anthony0327]

How will I know if I have the right crank? Is there a way to tell on the crank itself what year it is? I purchased one that was rebuilt by duncan racing. I know iIt's a long Rod but I'm not sure the year the crank came from.

[Pumashine]

Like your builder says either one should work. I was just saying if you put it on there and the crank still sticks out after the gear is put on you would have to use the thicker one.

[Anthony0327]

Ok. Thanks for the info.

[Anthony0327]

Thanks for the info puma. I just looked at my rebuilt crank and compared it with an 87 I have and the shaft is definitely shorter. Would never have noticed if I wasn't told. Thanks again. The rebuilt crank that has the smaller output shaft on the clutch side also has a G stamped onto the tins on the flywheel side in line with the pin for the connecting rod.

[croat1]

Bumping up this old thread with pictures.

Gear hits the basket.  Gear will need to be chamfered.

[croat1]

Chamfered gear.

[croat1]

Also, this is not right.  You don’t want this situation.  Gear won’t be held down.

Joe

[Langbolt]

How did you fix this situation Joe ?

The previous pic shows the gear farther than the end of the crank.....and this pic shows is inward ?

Was the Crankshaft collar too thin ?

Let us curious minds know

Thanks

[croat1]

How did you fix this situation Joe ?

The previous pic shows the gear farther than the end of the crank.....and this pic shows is inward ?

Was the Crankshaft collar too thin ?

Let us curious minds know

Thanks

John, crankshaft end lengths are different.  Also, gear thickness changed.  To “fix” the issue in the last picture a washer can be used (made).

Joe

[atvmxr]

good info and pics!

[croat1]

One last pic for clarity…not a good situation here.