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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 11-14-2012, 12:49 PM   #41 (permalink)
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Kreemsicle - You say you cleaned and oiled your filters a month ago. Is it possible you over oiled them ?
2 1/4 turns with 42 pilots will be way rich, see what it's like at one.
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Old 11-14-2012, 03:23 PM   #42 (permalink)
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All the Bonnies and Thruxtons came out of the factory with identical jetting, only the needles were changed for a richer AFR to take in to account the slightly larger CC and different cams of the 865's. Every carb'b bike in factory spec I've had on the dyno or linked to the LM-2 before mods, but with the AI disabled, shows a 12.0 - 12.4 AFR from around 2,500rpm to the rev limiter at full throttle, which is easily enough to take in to account an ethanol mix without the AFR going lean. This rich AFR ensures that where ever in the world and what ever the weather conditions, the bike won't ever be lean enough to cause running problems or damage the engine. No manufacturer of carb'd engines would release an engine running in a "notoriously lean" condition, that would be asking for trouble.

Having said this, I can see that for some owners if using an ethanol mix, minor adjustments may well be necessary for starting and smooth small throttle running as at part throttle the AFR is leaner.
me and other have seen them over here with a/f mix around 14.1 stock.Something does not add up with that much change from over there to over here.What maters is if its right where you ride it.12.0 to 12.5a/f mix would never pass the epa rules over here even with air injection I dont think.That is to rich even for 10%eth. fuel.
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Old 11-14-2012, 03:57 PM   #43 (permalink)
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Is that 14:1 WOT or part throttle?
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Old 11-14-2012, 04:22 PM   #44 (permalink)
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Kreemsicle - You say you cleaned and oiled your filters a month ago. Is it possible you over oiled them ?
2 1/4 turns with 42 pilots will be way rich, see what it's like at one.
Thanks db, yeah that's why I mentioned that it was starting and running ok before. I used only enough oil (in spray form) to turn the filter red, very careful not to even let it puddle against the rubber ends. And when I get her warmed up, she still pulls like a mule all the way to redline. I think I'll just use this new problem as motivation to finally put my CR's on and 790 cams in. I've been procrastinating because of all the good weather (and because I wanna finish my a/f gauge install first).

As a sidenote, I visited the mechanic at the dealership today. He said all the carb guys around here complain about the hard starts all the time in this cold, so it's not uncommon, especially with the '03 Bonnie's he said. I know that will get a bunch of you guys riled up, but remember, we don't all have the mechanical capabilities of many here on the forum. These are head scratchers for us that some of you came just tune out of a bike in a matter of minutes. And you EFI guys, no sarcastic remarks I wouldn't trade my carbs for nutn'. Just a little hiccup here, that's all. Not even really a problem as long as my battery is charged.
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Old 11-14-2012, 05:08 PM   #45 (permalink)
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Interesting. I've got an '04 T100 (built in '03) that's never had starting problems in any weather or in any of the various states of tunes it's had. I'm wondering if it's something to do with the ethanol you guys over the pond have.
As for oiling filters. That's something I haven't had cause to do yet but I've heard they're often over oiled and a quick passing waft over from a distance is sufficient.
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Old 11-14-2012, 05:09 PM   #46 (permalink)
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Wow! Lotsa sexist comments here. Not that I'm offended by them, BTW. I think it's all a matter of personality.
Very well done. You have a thicker skin than some of the men on this forum I can tell you.

I'm glad you got to the bottom of the issue, nice work.

What you have seen here is important - very often the solution to the bike problem is much more straightforward than you might think. Don't always rush to change jets and replace parts. Get some advice, try the simple stuff first.

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Old 11-14-2012, 06:27 PM   #47 (permalink)
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Is that 14:1 WOT or part throttle?
wot 7000 rpm and above
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Old 11-14-2012, 06:31 PM   #48 (permalink)
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Fixed my vacuum leak today (one of my manifold o-rings was toast). With 42 pilots turned out 1 and 3/4, started right up, was able to set a low idle, balance the carbs and it doesn't hiccup or stall at stops anymore even when cold.

I'm pleased.

I'm definitely running rich with just the snorkel removed and a unifilter, so I'm planning on removing the baffle this weekend.
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