I'm replacing a bent shaft on a 140FZ (I not II). I dug around in my spares drawer and pulled out a new shaft, part number F1519. Ah ha I thought this matches the part number from the FZ manual but when I remove the bent shaft I find a small difference. All dimensions are identical however the bent shaft has a machined oil hole in the shaft about 1/16" in diameter about 1/4" in front of the worm thread. Air blown throught the hole exits the centre hole in the back of the shaft. Unfortunately the new shaft does not have this feature.

Will the new shaft work in the engine at all, perhaps the hole is critical for the regulator, perhaps it will cause overheating etc?

Advice welcome.

Paul

The hole is for crankcase pressure to drive the regulator, but the early FZ used the lower left fitting on the backplate to drive the reg the other way. Put it in and try it, if it doesn't run, you won't hurt anything, so go for it and see what happens.