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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 12-07-2012, 09:29 PM   #21 (permalink)
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Took a 20 min ride. Bike is running much better at this richer mixture. I'm not sure I want to go back to the 40 pilots now. I do have them on order.
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Old 12-07-2012, 11:22 PM   #22 (permalink)
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If you're at 2.5 turns out on the mixture screws with the 42s, I'm not sure you'd want to go back to the 40's.
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Old 12-08-2012, 06:48 AM   #23 (permalink)
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Last edited by denbow; 12-08-2012 at 06:52 AM. Reason: mistake
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Old 12-09-2012, 03:58 PM   #24 (permalink)
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^^^Yes perhaps. But I thought I'd at least conclude my experiences for anyone using the site with similar issues.

BTW, yesterday I did these things:

-Removed tip-over valve
-Replaced Ignition coil with a Nology unit
-Placed a couple of wooden paint mixers on the seat rails to raise the seat up.

I should have done each separately to really isolate my problems, but that's too late.

My bike now starts easily with the choke on and I can put the choke in within 20-30 seconds and the bike won't die. It'll tickover just fine and this is in ambient temps of around 50 degrees Fahrenheit.

Overally I'm pretty pleased, although I still have encountered a couple of misses when getting off the throttle for a turn, making the turn and then quickly getting on the throttle again. The bike will lurch as there is a miss or a sudden lack of power and then pick up again in a split second. Not sure if this is a mixture problem or a electrical problem. I have a inkling it's the igniter but it's hard to test that.
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Old 12-09-2012, 04:27 PM   #25 (permalink)
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Check the wires and connectors on the igniter aren't loose.
Place some plasticine (or similar) on the highest point of of the connector plug, replace the seat, sit on it and bounce a few times. Then remove the seat and see if the plasticine's been compressed.
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Old 12-09-2012, 04:48 PM   #26 (permalink)
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Quote:
Originally Posted by denbow View Post
I agree. Yet something still isn't right. 2 1/2 turns? That's super rich, especially since his air box, although modified, is still there. The still-present stumble might validate that guess. Just from personal experience, an adjustment like that can cover up a bigger problem with a needle or main jetting.

Lucky, how's your mileage? My guess is in the high 30's. if so, I'd start at the top with making sure you have the right mains and working down from there.

Btw, my thought process would tell me that if I make adjustments to the jetting and the problem changes in nature, my problem is not electrical. But that's just me.
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Last edited by Bron-Yr-Aur; 12-10-2012 at 08:46 AM.
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Old 12-09-2012, 05:30 PM   #27 (permalink)
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This reply has been moved to another thread due to a location error.

Last edited by denbow; 12-10-2012 at 06:44 AM. Reason: posted in error.
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Old 12-09-2012, 05:32 PM   #28 (permalink)
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I'll let you know about my mileage at the next fillup. I'm mostly city these days so lots of stop and go and very little highway.

The present misfire has been there whether I've been lean on the mixture screw or rich. Which suggests to me that it is a persistent problem. It seems less of a problem with my "rich" mixture at the moment, however.

My theory is that since the misfire happens under acceleration, that my weight is pushing down on the seat-pan which is contacting the igniter and causing the misfire. I will try the clay compression test to see how much this is could be the case.

Either way, next weekend I'll be adjusting the pickup coil (if needed) and also testing the igniter and I'll report back with results.

Quote:
Originally Posted by kreemsicleT100 View Post
I agree. Yet something still isn't right. 2 1/2 turns? That's super rich, especially since his air box is modified but still there. The still-present stumble might validate that guess. Just from personal experience, an adjustment like that can cover up a bigger problem with a needle or main jetting.

Lucky, how's your mileage? My guess is in the high 30's. if so, I'd start at the top with making sure you have the right mains and working down from there.

Btw, my thought process would tell me that if I make adjustments to the jetting and the problem changes in nature, my problem is not electrical. But that's just me.

Last edited by luckyduck; 12-09-2012 at 05:36 PM.
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Old 12-09-2012, 06:05 PM   #29 (permalink)
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Luckyduck.
I'm running virtually the same set up as you and anything over one turn out on the mixture screws with 42 pilots is a little rich at idle. I could smell it in the exhaust fumes and the throttle blip test confirmed this. It's now at 7/8 of a turn, no smell, smooth running and the plugs are the ideal biscuit brown colour.
Note - 40 pilots needed 2.75 + turns out with the stock needle with one shim.
I suggest you try one turn to see if it makes any difference before digging into the electrical side...it doesn't take a minute.

Last edited by denbow; 12-11-2012 at 11:33 AM. Reason: Spelling
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Old 12-09-2012, 11:48 PM   #30 (permalink)
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I spent time doing exactly that today. I found that anything below 1.5 turns resulted in consistent coughs when rapidly opening the throttle and sometimes a backfire through the intake that could be felt coming out of the air filter opening.

I dunno what to say. I mean, I can definitely smell the exhaust and it does smell rich, but it runs so darn well at about 2 turns out. I've checked over and over for vacuum leaks and haven't found any.
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