Cylinder barrel base gasget or O ring?

[bubbles]

I'm just in the process of ordering up parts to strip the heads and barrels on my 1978 80/7. I have a spare engine with one side stripped and there seams to be no groove for an O ring on the barrel base and there was certainly no barrel base gasket so the question is what seals the barrels to the crank case, do I need O rings?
Also should I replace the external circlips on both ends of the gudgeon pins even though I will only remove one to release them from the pistons?

Thanks bubbles.

 

[DevonianScotsman]

I'm just in the process of ordering up parts to strip the heads and barrels on my 1978 80/7. I have a spare engine with one side stripped and there seams to be no groove for an O ring on the barrel base and there was certainly no barrel base gasket so the question is what seals the barrels to the crank case, do I need O rings?
Also should I replace the external circlips on both ends of the gudgeon pins even though I will only remove one to release them from the pistons?

Thanks bubbles.

I personally would replace the circlips. I've always found them to be weaker and less springy after a couple of uses.
As for the gasket/o-ring, have you had a look at a parts microfiche for the bike?
If not, call Motorworks and ask them - they know exactly what the bike needs.

Good luck!

 

[Kenny]

Good engineering to always replace a removed circlip from a gudgeon pin

If the barrel didn't have an O ring then I'm pretty sure there should ( probably he says ) be a base gasket.

 

[bubbles]

If not, call Motorworks and ask them - they know exactly what the bike needs.

Good luck!

Thanks for the feedback,spoke to the man at Motorworks yesterday, he rekons its metal to metal wiith no O ring or gasket. All parts ordered just need the enthusiasm to get started now