PLEASE READ AND LOOK AT ALL THE PICTURES TO SEE you’re looking for a UNIQUE YAMAHA KT100 MODIFIED WITH A LARGE BORE 55.15 NEW PISTON AND RINGS WITH A STROKER CONNECTING ROD BY SUPERDYNE ENGINE. IT DOES HAVE THE THREE BROKEN FINS. Still very usable. Was originally MIKE MANNING LOWERCASE WITH MACHINED BEARING SLEEVED . Sleeved crankshaft. 1/ 8 aluminum plate put between the cylinder and lower crank for the long stroke. As shown, you see they modified the bottom of the cylinder, . Check out to see how he machine the cylinder head. Pete was one of the best modified Yamaha builders in the country. IT was taken a completely apart and cleaned in ultrasonic cleaner, checked everything. IT COMES AS YOU SEE IT IN THE PARTS THERE’S NO CARBURETOR. Please look at all the pictures to see it’s in excellent condition. If you’re looking for a really good engine, you know what you’re getting.