valve shims

14 replies to this topic
  • mat

Posted June 05, 2002 - 06:53 PM


has anyone else tried to order odd size shims, ie 161 or 174, i cant believe all the dealers in my area can only get them in incriments of 5,

  • osheen

Posted June 05, 2002 - 07:04 PM


According to the manual, that is all that is available. I know that the increment of 5 shims can take you from being on the tight side to the loose side (and vice-versa) depending on what your clearance is. Always run loose instead of tight and call it good...........

  • moorespeed426

Posted June 05, 2002 - 07:10 PM


increments of 5 equal .002 thousants,so that should be able to keep you within tolerances,and I too would shoot for the middle to loose side of the spec

  • MX_Tuner

Posted June 06, 2002 - 01:11 AM


The specs listed are a large enough spread that the .05mm range are fine for getting the clearance within that spec.

  • Mark_Cantrell

Posted June 06, 2002 - 02:11 AM


Someone was talking about sanding them down. Since the shims you need are always thinner (valves get tight, not loose) and the number on the shim is the thickness (1/100s of a mm?), use a caliper and 400 sandpaper on a hard flat surface and make custom shims. Only heard of it, haven't tried it.

Good luck,

  • motoman393

Posted June 06, 2002 - 03:00 AM


I have sanded down my shims so I can keep them at the tolerances I choose. Go buy a caliper or a micrometer and some 600 grit wet sandpaper. Tape the 600 grit sandpaper to a piece of glass and sand the shim in a figure 8 motion. It took like 10 mins per shim to grind down (real hard metal) but still much cheaper than $5 a shim. Good Luck,


  • #302

Posted June 06, 2002 - 03:31 AM


try a different yamaha dealer. When I adjusted my valves i traded my old shims for new ones. The dealer that i used had odd sizes from trades and new shims in increments of 5. :)

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  • Shawbridge Husky

Posted June 06, 2002 - 06:10 AM


I grind them down in my shop on my surface grinder. Find a reputable machine shop in your area. They can do this with ease.


Posted June 06, 2002 - 08:17 AM


i concurr (sp?) on the sanding them down, it works great and you can taylor them to your specs, i use a digtal mic and its real easy!!!!!!jimbo

  • Hick

Posted June 06, 2002 - 08:23 AM


Will sanding them affect their hardness?

  • Ranger_426F

Posted June 06, 2002 - 08:35 AM



The answer is NO. The hardness will remain unless you use a surface grinder and get them real hot. If you hand sand them as Motoman does you will have no problems at all. If you do use a suface grinder do so in small increments wetting the shims every new stroke you take.

Have fun

  • Ian_M.

Posted June 06, 2002 - 12:10 PM


Buy stainless shim stock in sheets. i've used it before to true up the bed on my Atlas metal lathe. Justcut to fit your needs. cya ian

  • yamafreek_hawaii

Posted June 06, 2002 - 09:07 PM


I sanded mine down with a piece of glass and 400 sandpaper. I know that Honda uses the same shims in one of their bikes and those might be able to get in odd sizes.

  • gal

Posted June 09, 2002 - 06:38 AM


the manual notes that u can get shims in 5mm intervals ,so always go on the loose side ...
and if u need 174 u can buy 175 and use waterpaper(i hope thats how u call it...) to shave it a bit...

  • MANIAC998

Posted June 09, 2002 - 04:10 PM


HONDA SHIMS! Aint no way a Honda shim is going in my bike! Your mouth should be washed out with Yamabond. Sheesh... whats next? Red plastic? Maniac :)

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