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i'm checking my valve clearences and...

  • Thread starter Thread starter bottobot
  • Start date Start date
B

bottobot

Guest
... can't believe how tight most of them are! No wonder the bike sounds funny when I'm trying to start it. My feeler gauge doesn't go below .05 MM but I'm pretty sure that 4 of the cam lobes are in constant contact with the shim.

I am going to list my measurements and if you guys have any insight for me about this weird situation I would be happy to hear it. Next step is to measure each shim and then find a replacement that makes up the difference to what the spec should be.

|Cylinder 1 | Cylinder 2 | Cylinder 3 | Cylinder 4|
|... >.05 . ...| ... >.05 ....| ... >.05 ....|.... .13 ... ..|
|... >.05 . ...| . . . .33 ....| .. . .35 ....|... .05 . .. ..|
 
I'm going to have find that motion pro Valve Shim depressor tool on ebay and buy it. I can't buy it from their online store unfortunately as they don't ship to Canada.

I can't really depress the thing effectively with anything I have in the shop here so I can't measure the shims today as I can't get them out.
 
You also need to invest in some new feelers. That .05 mm feeler that is your smallest, is right in the middle of the range, so you don't really know what you have.

Even if you have to use an INCH set :eek:, most of them will go down to .0015", which is .038 mm, much closer than your .05.

Since you are in the process, I invite you to look in my sig.
down2.gif


.
 
I've added now the corresponding shims. I think whats happened is that I've mixed up a few of these, but either way some of them are definitely out of spec.

|Cylinder 1 | Cylinder 2 | Cylinder 3 | Cylinder 4|
>.05/2.75 .....>.05/3.10 ..| . >.05/2.94.|. .13/2.70 ... |
>.05/2.98 . | . .33/2.44 ....| ...35/2.69 ... .05/2.80 ..|
 
Those .33 and .35 readings don't seem right unless you bent some valves. Better go check them again.
 
Shim sizes are also unusually large, too. :-k

By the way, shim sizes are in .05mm increments, so your 2.94 is probably a 2.95, your 2.44 is a 2.45 and your 2.69 is a 2.79. There are some factory "X" shims that are half-sizes. Your 2.98 might be one of them, and would have a 2.95x printed on it. It should measure 2.975, so it's easy enough to read 2.98 on your gauge.

By moving that 2.70 from IN3 to IN2 and putting a 3.00 in IN3, your clearances will be good for those two. You will need a 2.75 for EX4.

You will need to get some proper feelers to measure the rest of them properly to see what else you might need.

.
 
bottobot said:
... can't believe how tight most of them are! No wonder the bike sounds funny when I'm trying to start it.
Click to expand...

This is how they usually wear, the clearances get tighter and tighter most of the time. The results you have are very common when the valve adjustments have been neglected.
 
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