Hi all

Is there a magic formula for getting the primary drive gear nut off on a TY175? I'm trying to replace the crankshaft seal without splitting the engine or removing the barrel etc. I've tried locking the crank via the flywheel but still can't get the nut to loosen off.

Any tips or tricks? Is it a left hand thread or anything?

Many thanks, Alan

Ah - job done. I was being too gentle with it!

For next time, and when you want to tighten it, don't hold the magneto flywheel because you risk twisting the crank out of alignment.

Ideal method to undo - use rattle gun

Next best method - jam a thick wad of rag in the pinch point of the primary gears

For doing it up again - use rag method and a torque wrench, and loctite on the thread

For next time, and when you want to tighten it, don't hold the magneto flywheel because you risk twisting the crank out of alignment.

Ideal method to undo - use rattle gun

Next best method - jam a thick wad of rag in the pinch point of the primary gears

For doing it up again - use rag method and a torque wrench, and loctite on the thread

I like your rag method and definitely use a torque wrench. I never use Loctite on a those nuts. I have never had one come loose without plenty of "encouragement" applied to the socket.

Thanks for the help - all done and back together now. Haven't run it yet - the carbs out for an ultrasonic clean tomorrow.