GSF1200 Pistons (Pre 2001 vs. Post 2001) ?

[nightrider]

So what the heck is the difference between the Pre-2001 and the Post-2001 pistons in the Blandit motors?

The pistons and cylinders have different pt#'s but everything else is the same (crank, rods, pins, cylinder head).

Most of the aftermarket head gaskets and piston rings stop at 2000.

Everything i see on the interweb has all Blandits at the same claimed capacity (1157cc)

What gives?

Higher compression pistons?

[nightrider]

Interesting, the rings are all the same part#

[fatblokeonbandit]

     in 2000/2001 when the mark 2 came out they had modified pistons to improve  the oil cooling. in some bikes the consumption was deemed excesive, so there was a mod to the pistons, the later  ones after vin 22102179, were fited with differant pistons, the older ones ars no longer available 

[nightrider]

Ohh ok, thank you. That clears it up.

Cometic lists head gaskets for only the pre-2001. I'm guessing they work for mark 2 also then.

[fatblokeonbandit]

the part numbers for the mark 1 and 2  head gaskets are differant but ive used a mark 1 head on a mark 2 engine with no problems so should be fine

[nightrider]

Thanks fatblokeonbandit

[rdubandit]

Yup, oil return holes had too larger over lap with the ring recesses and oil got burned!!  I have a set of the "bad" pistons.  I'd like to have a set of the newer pistons to measure the difference in the oil return hole diameter.

[nightrider]

I have both an 01 and a 99 Blandit engine.

When I get them torn apart I will compare and post the measurements