valve shims & Buckets - Page 3 - Triumph Forum: Triumph Rat Motorcycle Forums

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post #21 of 36 (permalink) Old 01-19-2013, 12:14 PM
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I have tinkered with bikes on and off for a few years.......

I have an Excel based calculator here if it's of use but if the clearances are within tolerance you won't even need to pull the shims out to measure them.
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post #22 of 36 (permalink) Old 01-19-2013, 12:31 PM Thread Starter
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So in this design, something must have been designed to accept the wear, this would be the shim correct.? If the shim was to wear, the bucket is allowed to drop down toward the valve stem and this in-turn creates a larger gap between the cam lobe and the bucket -Right? therefore increasing the gap that we measure between cam and bucket looking for our intake clearence for example of .10-.20 mm

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post #23 of 36 (permalink) Old 01-19-2013, 12:46 PM
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the wear normally takes place on the back of the valve or on the seat, so the clearance decreases.

if the shim was to wear the gap would increase, but it doesn't as the cam doesn't wipe it. the shim is merely "compressed" between valve stem and bucket.
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post #24 of 36 (permalink) Old 01-19-2013, 01:11 PM Thread Starter
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Rupert............so the shim's job is to determine how far open the valve will move off it's seat when pushed by the cam on the bucket, it's not to eliminate valve train noise.
So "IF" had taken out the 2.71 mm shim and installed a 2.73 shim(thicker by the .025mm increment) the valve would have open slightly further than it has been in the past.

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post #25 of 36 (permalink) Old 01-19-2013, 01:22 PM
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by that reasoning, yes. but i think the job of the shim is to accommodate manufacturing tolerances in the valve train.
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post #26 of 36 (permalink) Old 01-25-2013, 12:28 AM
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Re: valve shims & Buckets

Perfect topic for me. Just dropped my head off at the machine shop for a 5angle valve job. While we were discussing things (i just finished porting and polishing) he brought up a good point that normaly would have dawned on me but didnt. As he grinds the valves, and the valve seats, its gonna make the cam to bucket clearance A Lot less! So i will have to get smaller shims.

My question is , where the heck can i get them at? Do i order from the dealer? And where can i find this chart you guys are talking about?

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post #27 of 36 (permalink) Old 01-25-2013, 03:37 AM
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hey fella there is no chart......

Hot Cams sell shim kits. They're not cheap and you will have a load of shims left over but it's a start. You could always resell the leftovers.

You would have to build the head with nominal shims, measure clearances and calculate the correct sizes from there.

Measured Clearance + Measured Shim - Desired Clearance = new shim size

Inlet = 0.1 - 0.2 mm
Exhaust = 0.2 - 0.3 mm

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post #28 of 36 (permalink) Old 01-25-2013, 04:03 PM Thread Starter
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Originally Posted by cjimport View Post
Perfect topic for me. Just dropped my head off at the machine shop for a 5angle valve job. While we were discussing things (i just finished porting and polishing) he brought up a good point that normaly would have dawned on me but didnt. As he grinds the valves, and the valve seats, its gonna make the cam to bucket clearance A Lot less! So i will have to get smaller shims.

My question is , where the heck can i get them at? Do i order from the dealer? And where can i find this chart you guys are talking about?

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Cjim
I too looked at shim kits,Hotcams,BikeBandit,Wiesco, but after seeing the vast array of shims I wouldn't be using anytime soon(or ever ) plus the cost they want I decided against it.
I have a decent relationship with a local bike repair shop, we did a shim swap for almost no money,apparently some shops will do a swap for free.

Always stay to the loose side of the adjustment tolerance, saves trouble down the road, Rupert is a good source of info as well.
Good Luck

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post #29 of 36 (permalink) Old 01-25-2013, 04:18 PM
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Re: valve shims & Buckets

I was looking them up today, and the shim kit just looks like a waste, lol. $66 bucks per kit, with many sizes BUT ONLY 3 PER SIZE in each. Thats gonna be alot of money. So i think what im gonna do, is put it together without the shims, then take my measurements , and either research bikes with the size i need, or order what i need.

Also, im sure these are super hardened, but what about just shaving the shims down??? Im sure we would have to make a jig that would hold them firmly, as small as they are, but you think thats reliable? After all, ill need to go smaller not bigger.

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post #30 of 36 (permalink) Old 01-25-2013, 08:18 PM
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Quote:
Originally Posted by cjimport View Post
My question is , where the heck can i get them at? Do i order from the dealer?
Buy them individually at a dealer. 9.5mm diameter is a common shim size so if a Triumph dealer is not close then a local Honda, Yamaha or Suzuki dealer (and some auto dealers) may have suitable shims (and cheaper)!

For anyone else thinking of doing a valve adjust and looking for some guidance I posted a valve check/adjust guide in the Sprint forum about 3 years agao. It was based on my 1050 Sprint but also applies to later 955 engines that use shims under the valve buckets.

Check it out here.

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