someonr told me i could shave the bottom of my piston on the tb250 to give me more hp is that true or not......

thanks///.//../

 

I have never heard of shaving the piston. Shaving the head is done an help with alittle HP.

 

yeah - trinity does piston mods...I'm not exactly sure where and why they do the carving on the piston...but they claim
not only does it allow more rev and hp...but it helps with cooling too

 

Shaving the bottom of the piston skirt increases intake duration and therefore increases power a little. Most high performance pistons have either huge holes in the skirt or a large half moon shape cut out to increase flow. Cutting off the bottom is really not a recommended idea as you lose some of the stability that the skirt gives. Porting the jug is really the only way to go.Bubba

 

would i be able to do this my self ... if so what kind of tools would i need

 

pimp- you are right bub. trinty makes a piston where they cut a hole in the side to save wieght, and it dos not effect anything.

 

any of you guys ever done this? my R hasn't been rebuilt on probably 5 years...and I was planning on getting a prolite forged piston that is .040 over or .080 over depending on how bad my sleeve is scuffed up...but I wanted to shave it too and make it lighter...any have any examples of doing this?

 

What i think Badasss250rider is saying is, back in the day my dad use to race 2 stroke saabs they were 3cyl piston port(no reeds) you could shave the bottom of the piston to give it a few extra HP... I think they shaved .020 off the piston skirt... I would not do this like bubba said a port job is the best way to go...



Edit, it was .020 on the head.. 2mm on the skirt

 

trimming the bottom of the rear of the piston skirt will increase the intake duration but you will loose bottom end. you also can cut down the top of the piston at the exhaust port and this will give you more top end but you will lose bottom end. 1 mm at each place will add RPM to the engine. if you try this and it does nor work a piston is cheaper than a cylinder.

 

thanks guys....