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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 12-04-2012, 04:14 PM   #1 (permalink)
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Is it gapping, ignition coil, or something else?

So I've done a bunch of intake system replacements (o-rings, rubbers, stainless clamps) in order to get rid of a off-idle hesitation that is doing my head in. It's especially annoying that whilst waiting at a light and then accelerating when it turns green that my bike takes off a bit and then coughs and stumbles like it loses power or ignition for a few strokes and then moves on. It gets better as the bike warms up and it seems it's much worse when the idle screws are out 2.5 turns versus 2 turns (42 pilot jets).

Is this a gapping issue coupled with a strong (rich) mixture that's causing the problem? I would really like smooth, uniterrupted power deliver without this hesitation and coughing.

I think my next steps are testing the ignition coil with a multimeter and pulling the plugs (which I just recently replaced) and check their gapping.
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Old 12-04-2012, 04:29 PM   #2 (permalink)
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With 42 pilots you should only have the mixture screws out one turn, or less.
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Old 12-04-2012, 09:57 PM   #3 (permalink)
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+1 on what the above poster said...and I would add that, depending on intake and exhaust mods, you may actually need to put the stock 40 pilot jets back in the carbs to get it to run like you want.
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2003 T-100 (790cc), NARK, NH Togas, 8100 rpm rev limiter, 158 main jets, 42 pilot jets (less than 1 turn out on pilot screws), stock needles--no shims. 13 A/F ratio from 1100 rpm to 4000 rpm; 12 A/F ratio from 4000 rpm to 6000 rpm; 13 A/F from 6000 rpm to 8100 rpm.:D
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Old 12-05-2012, 01:52 AM   #4 (permalink)
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I forgot to mention I have snorkel removed, baffle removed and air intake hole enlarged.

The hesitation happens when accelerating at about 1/8-1/4 throttle. Sometimes the cut in power is so abrupt that I get chucked forward a bit from the engine braking that kicks in as soon as the power is gone for that split second.
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Old 12-05-2012, 06:12 AM   #5 (permalink)
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That means you're bogging...way too rich on the mixtures despite your intake mods. Read mine and Redbird's signatures and note the mixture screw settings.
+1 on what Redbird suggests about going back to 40 pilots if necessary.
It's going to be a lot less hassle for you setting yours at one turn than messing around with all the ignition stuff and possibly making matters worse.
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Old 12-05-2012, 09:55 AM   #6 (permalink)
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Yet another bike with a 42 pilot jet fitted to "fix it", throw it away, fit the 40 and set the idle mixture correctly, if there is still a problem then look to the electrcal system.
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Old 12-05-2012, 11:48 AM   #7 (permalink)
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42 pilots can work very well with suitable inlet mods and open exhausts on the 790 motor. In the OP's case he's probably better off going back to 40.
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Old 12-05-2012, 02:31 PM   #8 (permalink)
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Well, I've got a nology profire coil and nology hotwires on order. I'll be going back to 40 pilots soon.

I think I need to respace my seat as well, I fear that it's contacting the igniter.
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Old 12-06-2012, 12:52 AM   #9 (permalink)
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Quote:
Originally Posted by luckyduck View Post
and nology hotwires on order.
Right. We'll look forward to this sort of thread with those . Waste of money, cancel them if you can:

http://www.triumphrat.net/cruisers-a...-up-plugs.html

http://www.triumphrat.net/twins-tech...urning-up.html

Last edited by Forchetto; 12-06-2012 at 12:54 AM.
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Old 12-06-2012, 01:14 AM   #10 (permalink)
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Unfortunately I couldn't cancel them in time. I'll be returning them asap.
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