bad piston, bored?
- Thread starter badluck91
- Start date
one call does it all......................
Ken OConnor Racing, High Performance Motocross Engines, Performance Modifications, Motorcycle valve jobs, Motorcycle Crankshaft Rebuilds, Motocross Cylinder Porting, Motocross Cylinder Head Porting
i wouldnt guess at this stuff, one little thing not perfect and you'll be wastin hard earned dollars on another piston/bore, do it right the first time and you'll get tons of enjoyment out of it, have it checked by a proffessional
Ken OConnor Racing, High Performance Motocross Engines, Performance Modifications, Motorcycle valve jobs, Motorcycle Crankshaft Rebuilds, Motocross Cylinder Porting, Motocross Cylinder Head Porting
i wouldnt guess at this stuff, one little thing not perfect and you'll be wastin hard earned dollars on another piston/bore, do it right the first time and you'll get tons of enjoyment out of it, have it checked by a proffessional
also if you are gunna get a new piston get i micrometer first to make sure that it is an exact measuremeant
if there isnt scratching or scoring on the cylinder wall or piston... id say that youre good to go. couldnt hurt to do a compression check on it though. i believe good compression number should be around 45 psi ?? correct me if im mistaken.
also, check out the play in the crank bearing since youre in there.
also, check out the play in the crank bearing since youre in there.
I believe stock pressure is something like135psi isn't it, I think anything over 120 is good though, I'm no expert though
well im just gonna get the rings for now, after it blows ill throw a vitos on it.. how to tell what size rings i need/
like i said, take a micrometer to get the precise size, then order the rings from the piston company, every on is differnt, so i believe anyways
Indeed, get a mic. You can't measure hundreths and thousandths of an inch with a tape measure. Or have a shop do it for you
^^^Yep, I would bet your original measurements are off a bit too. Most bikes shops or machine shops will measure it for free. But it is the cylinder you need to measure. The piston will be smaller than the rated bore size. The rings you order will be to fit the cylinder size. They will also be able to determine your current piston to wall clearance.
If you feel like being fair about it, you can always pony up the extra couple bucks to order your parts through the same shop.
If you feel like being fair about it, you can always pony up the extra couple bucks to order your parts through the same shop.
My friend goes to a machine shop school and measured it for me and its 66.4972 millimeters. is that stock?
