FAT shims

[Guest]

From most of the reads I gather the majority of shims needing replaced are of the smaller size.

Working on the 78 and it seems that I need one as large as 3.10mm(NOT AVAILABLE).
Does this seem a bit unusual?
None of them require smaller than 2.65.

[Macguyver]

That does seem odd, maybe an improperly seated seal?

[Nessism]

Something is causing the valve to hang open.

[hampshirehog]

Unusual but not unheard of - maybe some one ground the top off the valve to max?

3.10 is available - part number 12892-45019 or 12892-45000-310. It's the fattest available so I would check everything else is right.

[Guest]

shim club

I have a bunch of thicker shims available. A couple are 3.10 from Suzuki. Check the inventory in the shim club thread. Ray

[mike_of_bbg]

Try running a compression test to see if your valve is hanging open. Are your cam journals wearing? What size was in there before?

[Guest]

I checked compression. Good in all but one but the bike has been sitting for years. Cant remember which one was low but, if a valve were stuck open would it have any comp at all?
Which brings me to another question. Perhaps there is some kinda buildup from sitting?

[Guest]

I think I'll just shim according to specs, run the bike(hopefully) and recheck em in short order. Re-shim if need be.