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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 11-18-2012, 09:08 AM   #1 (permalink)
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Do I have a shim?

In the middle of rejetting my carbs to account for my spiffing new DNA pods and it's recommended I apply 1 shim to my needle.

When I had my carbs rejetted recently by my mechanic, he said he had put a shim in, but I thought i would check.

When I removed the needle I was expecting a small metal washer, but what I found was a very small rubber washer and no metal washer.

Is this supposed to be the shim or should that rubber washer be there anyway and he didn't put any shims in as indicated?

Any help would be much appreciated...
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Old 11-18-2012, 09:25 AM   #2 (permalink)
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Hello
Shims as far as I know are metal washers in the order of 0.5mm thick and approx 3mm hole. No shim means just that.....no shim and nothing else either. Anything else (eg rubber plastic etc) would evoke a raised eyebrow from me. I would diplomatically quiz your mechanic about this.

Last edited by Tasmaniablue; 11-18-2012 at 09:28 AM.
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Old 11-18-2012, 09:32 AM   #3 (permalink)
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Originally Posted by Tasmaniablue View Post
Hello
Shims as far as I know are metal washers in the order of 0.5mm thick and approx 3mm hole. No shim means just that.....no shim and nothing else either. Anything else (eg rubber plastic etc) would evoke a raised eyebrow from me. I would diplomatically quiz your mechanic about this.
I am a little concerned at what I found in there...

I sort of resigned myself to the fact that there wasn't a shim, I just wondered if the small rubber washers were part of the original factory set up.
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Old 11-18-2012, 09:37 AM   #4 (permalink)
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Not as far as I know. I have an 06 btw.
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Old 11-18-2012, 09:40 AM   #5 (permalink)
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Hello
Not as far as I know. I have an 06 btw.
Thanks...

I'll see if anyone else has come across the mysterious rubber washers before removing them and sourcing some proper shims.
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Old 11-18-2012, 11:34 AM   #6 (permalink)
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I just had mine apart for the first time. No rubber shims. I have had many carbs apart never seen a rubber shim under a needle clip, plenty of metal and sometimes hard plastic but not rubber. Some rubbers may have a tendency to swell, harden or shrink from exposure to gas, in which case it may very well affect jetting. Were it me, I would swap it out since you've got it apart anyway. I like to use little stainless washers, which cost pennies when you buy a bag of them from a hobby store or electrical supply shop like Radio Shack here in the states.
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Old 11-18-2012, 12:02 PM   #7 (permalink)
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I like to use little stainless washers, which cost pennies when you buy a bag of them from a hobby store or electrical supply shop like Radio Shack here in the states.
Can you give me an idea of what size washers I would need to buy?
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Old 11-18-2012, 12:58 PM   #8 (permalink)
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Can you give me an idea of what size washers I would need to buy?
I seem to remember reading that they were just M3 washers with a thickness of 0.5mm.
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Old 11-18-2012, 02:00 PM   #9 (permalink)
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M3 washers aren't the best for the job, they have a burring on the under side where they're punched out of a sheet. If you mic them they of inconsistent thickness, not by much, but i've had some at 0.61mm which is too much if the other washer is 0.5mm.

The shims are of a much tighter tolerance, which is good for consistancy between cylinders.
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Old 11-18-2012, 03:59 PM   #10 (permalink)
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The shims are of a much tighter tolerance, which is good for consistancy between cylinders.
Any idea where I can order some Mike?
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