3 sizes which are oversized ones, there is no way you would have made them fit unless you had the cylinder bored to fit them.
I think you nailed it. When the compression gets low on a two-stroke, especially a small-bore, it loses it's power when off the pipe most, making it hit harder when it comes on the pipe. Your new top-end has restored that lost power outside of the powerband, so the difference in power when it is on the pipe isn't as abrupt or dramatic.Originally posted by cr250
PS I'm beginning to think the power loss is in my imagination