Power valve o rings?
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Where do the o rings fit, the orange ones? Also is there a gasket? Whoever built my engine last even had a black o ring sandwiched in. I really need a schematic or iTunes vid on how to reassemble the PV. I have the fixed PV with diamond end. It’s a 3bn engine with a 3mb barrel and head...
Ta! -
The kickstart side is straightforward, simple groove that fits perfectly. It’s the gearchange side that has no groove or place for a seal. The previous owner had the orange one just flopping around and a black smaller o ring squashed flat between the bush and the cover. Neither of those two are affecting a seal. I’ll check and see if there’s a paper gasket for that side. That would be enough of a seal...
It’s frustrating when the last owner didn’t know what they were doing, it makes reassembly a bear!... -
@SpookDog Oh Yeah
How annoying.Sorry, it looks like they are blocking that resource.
It's a parts diagram showing you where the O-Rings go.
https://www.fowlersparts.co.uk/main/img/assemblies/large/e2bbdd33f448b949dadded717beb407f.png?6
I'll get it hosted elsewhere and link it in.
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Fowler’s don’t like hotlinking apparently!
I found the diagram, unfortunately it is different from what I have fitted. I found I can affect a seal if I slip the oring over the end cap. Without it the whole cap/bush is very loose. It slops around loads! Whereas the other side is a good fit.
I wasn’t even sure if it was original to the barrel. Who knows what butchery was done before. The PV has 3bn on it I think, yet the barrel is 3mb. I don’t know if there’s a difference. I’m still fumbling around in the dark. The only other 2strokes I’ve worked on were air cooled, ts er’s, and more shedloads of Vespa & Lambretta’s than I can recall. I don’t recall them having an oring between them
Cheers bud! -
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Sorry, was busy thumb typing on a tiny screen!🤪
It’s not just the bush, the end cap it fits into also seems small. Plus it’s fixed, doesn’t move...
I’m guessing that the 3mb was a later servo operated valve? Totally different end cap on that side?... -
Dont do what I did when I was being stupid and try and fit the o-rings onto the power valve itself lol
They go into the end caps and there is also an orange seal for the pulley end as well
I also got a black o-ring in my Athena gasket kit from PJME and have no idea where it goes
Wish it was the thermostat one as I need one but its the wrong size
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@Calum there is an o-ring under the thermostat itself with the gasket above that
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