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four stroke cylinders
Posted: March 14th, 2008, 8:12 pm
by aloha450x
i changed the piston on my 450x once. do you not rebore them? what makes them diffrent from 5hundy cylinders. i know another dumb question
Re: four stroke cylinders
Posted: March 14th, 2008, 9:27 pm
by bigjay
aloha450x wrote: what makes them diffrent from 5hundy cylinders.
the main difference is that they have a bunch of suck all over them and 500 cylinders lack the suck
in all seriousness if the piston is bieng replaced due to age/wear the cyl. should be bored, that goes for all internal combustion engines
Posted: March 14th, 2008, 11:03 pm
by aloha450x
it just seems that you don't hear to much about reboring a four stroke. was just wondering if there is something you can do to keep from reboring the 5hundy cylinder and just change rings and pistons
Posted: March 15th, 2008, 7:38 am
by sabreguy
That's because they blow up before they need a bore job!
Posted: March 15th, 2008, 6:10 pm
by madmcnish
It all depends on the piston & cylinder wear and the required tolerances.
For example: You may need a new piston, but the cylinder bore shows very little wear and is still within tolerance, so you wouldn't need a re-bore.
The 5hundy has an uncoated steel cylinder liner which is relatively cheap to rebore.
Most other bikes (including 4 strokes) have a coating on the cylinder (Nicasil for example). This coating is harder and longer lasting than plain steel, but the cylinder requires to be re-plated and then re-finished to the required bore when it's worn-out.
This costs a LOT more than just a rebore.
Posted: March 15th, 2008, 8:45 pm
by britincali
^^^ Nailed it.
Also a lot of these new 4strokes have very little barrel material, you sure cant bore 'em 5 times