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29.5mm shims don't fit my 850

Wallowgreen

Wallowgreen

Forum Mentor
Past Site Supporter
I'm into the first valve adjustment on my '79 850 and found the exhaust side to be way loose (worst was up to .23mm). I ordered shims from Z1 to correct them all and bring them back into spec and now have those in hand. Trying to fit them this morning and found they won't fit in the buckets. Didn't think to measure the diameter before ordering and now the 29.5mm shim doesn't fit, I've measured both with my caliper. Sure enough the shims in there are 29mm diameter, kind of explains why the new one's don't fit but now I'm confused as to why they aren't 29.5mm shims.

What does use 29mm shims? I'm now suspecting the head may have been swapped at some point.

Any other ideas?

Thanks as always.
 
29mm shims are for Kawasaki's. Do the 29mm shims fit tightly in the valve bucket? If so, someone swaped your buckets for Kawasaki buckets. Not good.

How about posting some photos?
 
Just been having a closer look, the 29mm shims are not a tight fit. Raises the question how tight a fit should the shim be? I figured there should be some play but maybe not. I'll go see if I can get a better idea of what gap there is between bucket and shim. If it's .5mm I might get a bit more forceful putting the shim in.

Should they be a tight fit?
 
Wallowgreen said:
Just been having a closer look, the 29mm shims are not a tight fit. Raises the question how tight a fit should the shim be? I figured there should be some play but maybe not. I'll go see if I can get a better idea of what gap there is between bucket and shim. If it's .5mm I might get a bit more forceful putting the shim in.

Should they be a tight fit?
Click to expand...

Tight fit yes, it's often necessary to pry them out with a small screwdriver blade. Sounds like some idiot stuck KZ shims in the regular GS buckets. Use the proper size or a shim may get spit out at high rpm.
 
Maybe I'm just not being forceful enough with the new shims! If I turn the bucket so the notch is accessible, I can get a 0.5mm feeler in easily between the shim and bucket lip.

Going to try again...
 
Ok Ed, I have to admit it looks like I'm a bit of a wus!

Looked at all the shims in their buckets, some have a gap to the bucket, some don't. I figure whoever did the last adjustment used the wrong diameter shims probably because that's what they had.

Had another go at fitting the 29.5mm shim in ex1 and with a little gentle persuasion it went in. I was worried about getting it in there and never being able to get it out again.

I suppose I'll need to replace all those that look loose to be on the safe side.

Panic over... whew!!
 
Went round the shims again measuring the diameter this time as well. Turns out six of the eight were 29mm diameter, only thought I needed to change three so now I have to wait for another three to get here.

Don't know who did the work last time but it's peed me off a little. Wanted to move on to the next thing preventing #1 from firing consistently. Was hoping to find something wrong with the valve adjustments on #1 but sadly nothing particular to that pot. Oh well...
 
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