Triumphrat

luckyduck

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.

denbow

With 42 pilots you should only have the mixture screws out one turn, or less.

RedBird

+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.

__________________
Larry
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
2007 Tiger 1050--White:D--SW-Motech crashbars, Skidmarx rear hugger/chain guard, Calsci +7 windscreen.

luckyduck

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.

denbow

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.

fullplat1

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.

denbow

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.

luckyduck

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.

Forchetto

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

luckyduck

Unfortunately I couldn't cancel them in time. I'll be returning them asap.