Hi
I did a little research on who is doing what with the 660cc Yamaha engine over here, and this is what I came up with.
Crank Works, in Arizona, and Craycraft Racing seem to be engineering giganto horsepower into their engines and have been taking most of the big tall blue trophies and cash away from the races.
Craycraft Racing has a nasty 760cc engine package that rips long and deep holes in the ground, and have built the World's Fastest Raptor,and Crank Works of Arizona builds nearly indestructable crank assemblies for all types of racing.
Both have Sterling reputations and are reputably very friendly and helpful, like most champion motorheads are.
Crank Works probably throws away more good Stock Raptor Rods than anyone else, and may just sell them cheap and send them over for a song.
It may be a source of stronger MZ rods, very cheaply obtained.
Crank Works also stocks Falicon, Pro X, Carrillo,and Hot Rods connecting rods, any of which would certainly solve anyone's
weak MZ rod problem. They are also developing a new rod of their own for 760cc or more race kits, and it looks like it will be stronger than a Carrillo.
Check out the photo of the new rod on their website at
www.crankworks.com.
It is dead serious business, and a beauty to behold.
Hope this helps someone over there, as bikes are infinitely more fun when they aren't broken and can be properly thrashed without unwelcome knocking or explosions.
Besides that, it is inconsiderate to dump engine oil and pieces on the road.