[bljones]

ouch. Here's my approach, in order of preference:
1. if the flywheel is not threaded, CAREFULLY grind off the head of the offending allen bolt, remove the flywheel, then clamp down on the stub of the bolt with a pair of vicegrips and remove with a little torch heat.

2. use an impact driver and hammer in a size larger torx or 12 point allen socket. Use lots of PB Blaster to help break the bond.

3. If you have a welder, clean the bolt and weld a nut to the stripped head. use a regular socket on the nut to remove the stripped bolt.

 

[bljones]

Does the bolt head look like the one on the left or the one on the right in this pic?

if it is the one on the right, use two pairs of vice grips- one pair clamps tightly to the head of the bolt, sticking straight out, and the second pair clamps to the first pair at a right angle. Use the second pair to provide leverage to turn the pair clamped to the bolt head., along with copious amounts of PB Blaster.

 

[bljones]

PB Blaster beats Kroil every time, in my experience. i haven't used anything eles to remove stuck bolts in the last 5 years.

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