If the 250 ignition is used, I think thats what you are saying, then we would have to use the 250 flywheel. Even with the heaviest weight that Steahly makes, I think it would still be lighter than the stock 500 flywheel. That may work ok in the desert but could be a handfull in the woods for some. I forgot who it was, I think it was one of the hill climbers, but I believe he said the 250 ignition turned the 500 into an animal.