Ms460 cylinder gasket.

[Gerbutt]

Hello

 

I noticed when I was fitting the cylinder to my 460 that the new OEM gasket stuck out a bit over the transfer ports. Has anyone else noticed this, and do you trim to suit?

[spudulike]

I thought these gaskets were shim steel coated with rubber so are not able to be trimmed. If it is gasket paper then trim away otherwise the gasket will affect the flow up the transfer cavity.

[Gerbutt]

Yeah it is the metal type. Strange it overhangs hey, sure like you say it must impede the flow? Do you delete the gasket on a 460?

[spudulike]

You can delete the gasket but the cylinder will need a bot of work on it to do it otherwise I think you end up with 0.3mm squish which is just too low to be safe. It is one saw that Stihl are pretty keen on clearances.

[Gerbutt]

Is 0.6 the ideal clearance? I had a dabble at mild porting it, just widened and cleaned up the intake and exhaust and just cleaned the transfers. Seems to have made a difference, outruns a 461 now and keeps up with a 661. I’ve got it set to 14100 rpm and the plug colour seems ok. Would be nice to have a little more torque. Does raising the compression do that?

[spudulike]

0.5mm is the documented minimum and yes, it will increase the torque on this sort of engine at these revs.

[Gerbutt]

Do you adjust the squish band when you delete the gasket bud?

[spudulike]

59 minutes ago, Gerbutt said:

Do you adjust the squish band when you delete the gasket bud?

It depends on the saw but have done in the past.

[spudulike]

Been porting a customers MS460 today.......the transfers are in the side of the cylinder wall and not in the base so not sure how they are impinged by the base gasket, should have realised when it first came up!

[Gerbutt]

Been porting a customers MS460 today.......the transfers are in the side of the cylinder wall and not in the base so not sure how they are impinged by the base gasket, should have realised when it first came up!

Only just seen this bud. I think I may have used the wrong term. When you take the cylinder off and look at the casings, it’s a circle with two “Ears”, the gasket was sticking out a bit over one of the ears.

Did you raise the comp on the one you did?