Can anyone offer any advice on removing the flywheel from a '74 TY250A? I have removed the left crankcase cover and have the proper flywheel puller. After removing the nut and washers I installed the puller and tried to pull the flywheel without using too much force but no joy. Is it possible that the flywheel could have corrosion on the shaft impeding the removal? Before applying anything like PB Blaster I thought I would get some information from the illuminati. Thanks in advance.

you have to " shock " the flywheel off by hitting the puller bolt with a hammer when tight

don`t over tighten the puller or you will strip the thread

I also had one that was well and truely stuck, tapping, penetrating oil. swinging on the end of a torque wrench, nothing would shift it.

Resorted to the "hot spanner", put on puller and heated the the magnto taper.

It got b****y hot but sprung off with quite a bang! Luckily I caught it before it hit the floor.

This is not the first time it has happened on a Yam so I lightly copper grease part of the taper to aid removal in future.

Edited November 18, 200916 yr by mattylad

I think it might be a bit dicey to grease the taper surface. I remember that warning being drummed into me when I was an apprentice machinist. I don't remember why though!

I only grease part of the taper, the quality of the fit is too good (yam quality)

You are probably correct about not greasing but you have problems getting the thing off again if you don't so the choice is yours.

If it does fly off under load you have a long walk back but at least it is well contained.

Ive been running mine for a year now in this condition without problems.

Had the same problem within the past month. Thought I was going to either break the flywheel or the puller. Several days of penetrating oil and banging the puller didn't work. Ended up heating the shaft with a torch. As mentioned , it really came off with a bang and came flying. Nothing seems to be hurt- I'm now riding the bike again. Watch the heat, I worried about the seals.

Alan

To report back, thanks to the advice about a bigger hammer, I was able to remove the rather recalcitrant flywheel after letting a shot of PB Blaster soak for a day or two and attaching a third hand wrench to the flywheel. I tightened the flywheel removal tool, rapped a few times with the hammer, tightened a little more, rapped a little more, and then like an impatient virgin it flew into my waiting arms. I believe that I'll put this on my list of routine maintenance to perform. Thanks again folks, Mike