Stage III Kit/435cc by Stoneman The following is a summary of the details I learned from Chris Of CW Racing concerning the work done to my 89 Pilot. The cylinder and head have had work done to each.He has not kept any records of his work, so the details of the porting and rechambering of the head etc. is some what a mystery.It is clear major porting has been done to the intake areas. There is a aluminum plate between the case and cylinder. I learned he used three different sized plates .1mm,1 1/2mm,& 2mm.Mine appears to be 1 1/2mm.There was a base gasket between the cylinder and the plate on mine along with gasket sealer between case and plate. I intend to use a gasket on both sides of the plate just to be safe on clearance. Stock head gasket is used. Now beleive it or not, the piston is Suzuki, out of a TM 400,a 70s open class dirt bike.The size of my current piston is 1.50 over.I still have a bore left for the next size, 2.00 over piston. The Wiesco # on the 1.50 is 299P6. The # on the 2.00 is 299P8.These appear to be hard to get from Wiesco but CW does stock them.The wrist pin & clips are from the TM 400. The top bearing is from a CR500. I was told both the piston & bearing are all the same as far as what year to use.There are three horizontal holes drilled in the piston skirt on the intake side. Each holes diameter is @10 mm. I will have more details on that when I receive my new pistons. The intake boot is a aftermarket piece. I believe its off a CR 250. It doesnt have the slight bend that the stock boot has and it accepts the bigger carb opening. The reeds are aftermarket also,Boyseen. A 39 mm PWK carb supplies the fuel. CW suggests a 170-190 main jet(but thats in CA.) and start with the needle high, better fat than lean,right? @50 HP at 7500-7700 rpms, so he says. Also suggested disconnecting rev limiter. "Ride it flat out. Dont let your sister putt around in it, it will get hot!" Stoneman Other notes and such. Uses a Susuki TM400 piston 71-73? 400TM, 1971-75 and 400TS, 1972-77 are the same piston 299P6 & 299P8 1.5 & 2.0