Flywheel question.

Did a 70's 250 ever take a larger flywheel like a 390 did? I bought a crank that has the pie shaped counter balances instead of the round weights with the larger shaft on the ignition side. The seller says it's 78/79? I never seen a larger ignition flywheel on this year 250. I'm thinking a 360/390 crank.

I worked on mainly '77 to 86 huskys.

Any bike that had FEMSA points, like my 76 250WR, came with the large crank snout like the 390. However, you are correct that only the larger engines had the non-full circle crankwheels, even a 250 with the larger snout will have full circle crankwheels.

I believe the non full circle cranks were used in the Auto models. I am not positive since it has been awhile since I saw my 79 390WR crank, but I am sure it is full circle. I do know my 430 cranks are full circle.

Also since someone had asked a related question about the MAG and later non primary kick engine cases and the response was those cases are the same other than the change to double motor mount point when the 390 was release in 1977. The responder also said the crank cheek diameter was the same between 250 and 360/390. The different stroke values were controlled by the offset from center.

Maybe it was the autos, I dont remember for sure. I do know for sure that any size Husky with a FEMSA points ignition has the large crank snout.

It has the shafts like a 250/360/390, six speed. I hope it's a extra 360/390 crank. But a 250 with a 390 sized flywheel would be a rock climber. Tamer and torquey.