6 replies to this topic

[diligaf]

I want to decrease the compression on a 280 pro. The stock is 0,8 what is a good gasket thickness to use and can you combine 2 gaskets?? I'm trying to tame the 280

[crasher]

hi mate, i've got a head spacer on my 250 pro, which lowers the compression without altering the port timing, which apparently happens if you go the base gasket route, head spacer is about £12 FROM bvm moto or any other bike shop you care to use, softens the engine up nicely, have you got a flywheel weight as well?

[diligaf]

No weight yet, just looking at options, The 280 can be a little fiesty, I'm considering what to do. The gaskets are real cheap and easy to fit so thats my first choice.

[laser1]

Head Spacer is the best value. Cheap and bike still runs good. Easier to KS and saves money on lower octane gas as well.
FWW is OK - but too pricey IMO
Base Gasket cheap, but as previous poster said, will change port timing. I havent tried it though - let us know if you do.

[husky]

Tried thicker base gasket on a 300,ruined the top end and had a minimal effect low down,so I don't advise it.I would fit a flywheel wieght and/or a slow action throttle.It's more expensive but runs/rides much better,I think these engines are very sensitive to different port timing.Never tried a cylinder head spacer,but I know some who have had head sealing problems

[laser1]

Jim snell (risingsun) has a video on how to correctly install the orings on the head spacer - if followed - no problems. Know of several w/o problems.

[crasher]

i've put head spacers on 2 gassers and not had any sealing problems, i put a bit of silicone grease in the o ring slot to hold them in place when putting the head back on,maybe this was the problem the other guys have had?