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Did you check the port timing/heights (dt250) against the ty cylinder? On my TY I moved the pegs down and back, also I modified the upper triple clamps to use Gas Gas handle bar stands, the bars mount forward about 1.25 in. I've been using either a 25 or 26mm dellorto, been playing with slides, won't run clean with a "40" cut away, using 60 or 70 cut aways. Using a Uni filter, done away with the stock air filter box. What kind of modification to the clutch side cover have you done? Anyone know of aftermarket triple clamps for the TY? Next on the list is electronic ignition, and then a big bore kit. Fred Wyoming homepage

Any pictures of this frame and bike? Fred

Here's pictures of my bike Fred's bike One thing that help's, is to remove the head gasket, clean the surfaces, and use high temp silicone, torque and let sit 24 hours before starting. I machined the head, moved the squish band closer to the piston. Cleaned up the ports, raised the exhaust about 1mm, knife edged the transfer port lower edge from the crankcase. Removing the band on the flywheel helps the motor rev quicker. Boysen reeds really help. Fred

On my 74 TY I use boysen reeds, good change, removed head gasket, used hi temp rtv to seal, ported cylinder and modified head removed the ring on the flywheel, moved the pegs down and back Suzuki front wheel gearing 42x10 Use at times Yamaha rear hub with a Fantic tubeless rim modified upper triple tree to use pro taper bars bars moved forward Gas Gas Dellorto carbs, 25 or 26mm jetting for 5,000 ft altitude fork tubes 1/2 inch above the top triple tree makes noticeable differance in turning Bultaco muffler and stock rear