KDXRIDER.NET

Hi All, well used to have a 2001 KDX200 but swapped it for FZR1000 basket case ,(mistake of the century).
but its almost ready to sell on and a "cheap" non running 98 kdx220r came up.
IMG_3268 by mark.dobson, on Flickr
my buddy has a 05-220r and i much prefer the power delivery (grew up ridding trials bikes).
so its missing a bunch of parts but i though best open up the motor and see the depth of what i have got myself into.
IMG_3279 by mark.dobson, on Flickr
IMG_3281 by mark.dobson, on Flickr
It has a neat seat no tears or rips just a bit grubby.
IMG_3283 by mark.dobson, on Flickr

does that look like the OEM PISTON.
Do o weisco have identifing marks etc ?
the piston looks newish.
and the bore looks ok , no obvious marks.
the head look like its had something dinging around for a bit but not terminal.
so on the whole a good start.
cheers mark

Its a Wiseco, the part # 750M06900 is stamped on the crown. Thats a standard 69.0 mm piston

So far, so good. I second that it is a Wiseco. Check the bottom end well. When they blow up, sometimes the shrapnel goes down. The stock piston may have been ran to death.

Thanks for confirming the piston.
thats good news .
i will take the barrel of and check the crank for play and crunchiness.
cheers mark

well this is odd ,
i took the cylinder off to check the con rod and piston .
and the con rod /crank seem good no decernable up and down play and very little side to side.
but the cylinder bore measures with a bore gauge bang on 69 mm with a small amount of ovality going to .007mm bigger.
i am sure its meant to be 69.025 to 69.041.
no marks in the bore either.
should i send it out and get it honed into limit.
whats your thoughts .compression was only at 75 but i think the rings were stuck..
the piston was worn to 68.8.
cheers mark