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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.
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post #11 of 17 (permalink) Old 11-05-2012, 05:02 PM Thread Starter
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Well you've got me stumped with the sock trick - don't really understand what you're trying to get at though.

The engine's running fine now, not hunting or rough running off-idle - warmed her up completely with no change - without the shims it got much worse as the engine heated up.

07 Thruxton: TEC 2 into 1, K&N, TTP Breathe Bellmouth, 135 mains, 40 pilots, std. needles, 1 shim (0.65mm). All baffles removed. Bitubo Fork Cartridges. Bitubo Rear Shocks. TEC Steering Damper. 3 Pot Nissin (Honda) brake caliper.
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post #12 of 17 (permalink) Old 11-05-2012, 05:46 PM
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I had the same thing when I decided I couldn't leave well enough alone and took the single thin shim off each needle. What a difference a shim makes. I was surprised, I didn't expect it to change much.

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post #13 of 17 (permalink) Old 11-06-2012, 12:23 PM
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Originally Posted by Gary_spain View Post
Well you've got me stumped with the sock trick - don't really understand what you're trying to get at though.

The engine's running fine now, not hunting or rough running off-idle - warmed her up completely with no change - without the shims it got much worse as the engine heated up.
He's trying to make you run a bit richer with the sock .
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post #14 of 17 (permalink) Old 11-07-2012, 05:26 AM
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Originally Posted by LukiSevenAce View Post
It's possible there's more than 387% better "CFM" being delivered by the mod.

Try stuffing a sock in the throats, but use wool ones and not the synthetic type.

The wool sock will have a thread count on the package.
Look for a number between 250 & 350, but not higher than that; any higher thread count will cause the carbs to choke down more than you want.

You can turn the balled up sock (called 'indexing') 90° to adjust the idle too.
Turning it 45° will alter the tone of the exhaust note. (Look for a high C)

Good luck with it.
*I like the part where you know it's running 'just fine' without taking it out on the road.
Genius!
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post #15 of 17 (permalink) Old 11-07-2012, 08:55 AM
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As far as a good AP goes, try "GForce".
I think there's a free version and a 'pro' version ($$).

The AP is only as good as the device it is 'reading', of course.
Reliance on the on-board accelerometer (a thing that isn't as big as the fingernail on your pinkie), is subject to scrutiny.
Like GPS devices have error, so will the smart phone you're using.

Though, and I'll give you this, it's great that y'all are willing to actually test performance of the mods in actual, road going situations.
I applaud that (and shall refrain from my petulant peanut gallery contributions to these threads.)

GForce Pro charts too.
Just looked up another one - Dynolicious. Seems to be more robust (than GForce being a mere display of the accelerometer in your smart phone.
Another one - Dynomaster (Android only it appears.)

"Feel" is either a noun or adjective. Lots of uses and meanings.
Applying it to a sensory experience, like 'feeling the bike pull', is strictly subjective analysis - and, thereby, fraught with error.

Putting a meter on the bike for testing and charting, is a great suggestion.

*Just a point about GPS -vs- accelerometer; they both have 'built in' errors. Like the average GPS is only accurate up to three meters, and is subject to noise, bias and deficiency.
Accelerometers (generally) measure only 'proper acceleration' and not rate of change velocity. The miniscule device in our phones, as mentioned, can be prone to error.

However, using any AP to rate or chart MC performance before and after a mod is better than the subjective analysis.
Anxious to hear/see the results. (sock or not.)

Last edited by LukiSevenAce; 11-07-2012 at 09:15 AM. Reason: notation on GPS -vs- accelerometers
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post #16 of 17 (permalink) Old 11-07-2012, 06:50 PM Thread Starter
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On that note I think I'll definitely "put a sock in it" (I may even try rotating it 90º just to make sure the noise reduction is adequate!)

07 Thruxton: TEC 2 into 1, K&N, TTP Breathe Bellmouth, 135 mains, 40 pilots, std. needles, 1 shim (0.65mm). All baffles removed. Bitubo Fork Cartridges. Bitubo Rear Shocks. TEC Steering Damper. 3 Pot Nissin (Honda) brake caliper.
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post #17 of 17 (permalink) Old 11-07-2012, 07:27 PM
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Quote:
Originally Posted by LukiSevenAce View Post
It's possible there's more than 387% better "CFM" being delivered by the mod.

Try stuffing a sock in the throats, but use wool ones and not the synthetic type.

The wool sock will have a thread count on the package.
Look for a number between 250 & 350, but not higher than that; any higher thread count will cause the carbs to choke down more than you want.

You can turn the balled up sock (called 'indexing') 90° to adjust the idle too.
Turning it 45° will alter the tone of the exhaust note. (Look for a high C)

Good luck with it.
*I like the part where you know it's running 'just fine' without taking it out on the road.
Way to sock it to em!
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