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Shim now or shim later

  • Thread starter Thread starter cadmandu
  • Start date Start date
AirCooledFour said:
So if I buy a 29.5 - 29.45, this is a .05 shim? I'm horrible at math!
Click to expand...


Hmmm.... I think you may be getting a little confused here bloke. There are two dimensions you need to worry about, the diameter and the thickness. One at a time...

The diameter you need is 29.5mm nothing else. If you get in there and find you have some 29.0mm shims fitted, take them out and replace them even if the clearance is correct. At high revs they can be thrown out the bucket and have a great time bouncing around boogering everything up.

The thickness is the number everyone's talking about the math on. In metric (which is real money of course :D) they step in increments of 0.05mm. So for example a 2.80 shim is 2.80mm thick. Next size up is called 2.85 and is... yes you've guessed it... 2.85mm thick. Only other thing is sometimes the thickness is referred to without the decimal point so 2.80mm shim can be noted as 280.

Hope that helps.
 
Thank you!

Thank you!

Wallowgreen said:
Hmmm.... I think you may be getting a little confused here bloke. There are two dimensions you need to worry about, the diameter and the thickness. One at a time...

The diameter you need is 29.5mm nothing else. If you get in there and find you have some 29.0mm shims fitted, take them out and replace them even if the clearance is correct. At high revs they can be thrown out the bucket and have a great time bouncing around boogering everything up.

The thickness is the number everyone's talking about the math on. In metric (which is real money of course :D) they step in increments of 0.05mm. So for example a 2.80 shim is 2.80mm thick. Next size up is called 2.85 and is... yes you've guessed it... 2.85mm thick. Only other thing is sometimes the thickness is referred to without the decimal point so 2.80mm shim can be noted as 280.

Hope that helps.
Click to expand...
Thank you very much, it helps a lot!!
 
cadmandu said:
.05mm is equal to .0019" Is this not correct?
Click to expand...

Hi,

Technically, yes. There are metric equivalents for Standard American measurements and vice-versa.

Personally, in order to avoid confusion, since mine is a metric bike, I use metric tools and metric measurements. I know a lot of folks use nothing but .001" to .003" when spec-ing their valves, but when in Rome....


Thank you for your indulgence,

BassCliff
 
Wallowgreen said:
Hmmm.... I think you may be getting a little confused here bloke. There are two dimensions you need to worry about, the diameter and the thickness. One at a time...

The diameter you need is 29.5mm nothing else. If you get in there and find you have some 29.0mm shims fitted, take them out and replace them even if the clearance is correct.
Click to expand...
You may think, "what's the big deal, there's no chance of that happening". WRONG. :eek:

Kawasakis and some Yamahas use 29.0mm diameter shims. If the bike was ever taken to a dealer that handled either of those two makes, there is a remote chance that the wrong shims had been installed. Worse yet, if a previous owner had either of those two bikes, there is a better chance that the wrong shims were installed.

A couple members here have recently reported doing their first valve adjustment and found multiple 29.0mm diameter shims in their bike, forcing them to buy more shims than they would have otherwise needed.

.
 
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