Triumphrat

dazco · 09-13-2005, 11:17 AM

What could make my speedy change overnite w/o touching anything? Having put the Tbikes on and balanced the carbs, set the mix screws to about 3-1/2 and removed the snorkel, my bike was running perfectly and way stronger than it ever has. Drove it for a couple days after the last thing i did, the snorkel removal, then this morning on the way to work heres what happened. I drove about 5 miles to the freeway, got on the freeway and took off in a pretty healthy manner and found that at freeway speeds i was getting some hesitation when opening the throttle after closing it, and popping on decel.

Now mind you, this bike has NEVER popped once since the day i got it including since i've had the pipes on. And i've also never had hesitation. But what i don't get its that it just changed from one day to the next from perfection to this w/o touching a thing. Sounds like it's too lean and probably a bigger main jet, not? But why all of a sudden? And by the way, once i got off the freeway and did the remainder of my ride to work on about 5 or 6 miles of street, it popped one time and no hesitation.

Now here are the things that were different this morning than others. It was the coldest i've ever ridden since i got the bike.
I ran it out of gas about 2 miles before i got on the freeway and it took a good 30 seconds before the engine ran perfectly after turning the tap to reserve. (seemed much longer than usual)
Then i stopped and got gas at a station i never go to usually.

I wondered is running out of gas could cause repercussions even 5 miles or more down the road since it ran out, or whether the station i gassed up at has dirty gas, or even the cold morning, which by the way was a bit foggy. (water in the air=water in the fuel?)

Any thoughts on this? And keep in mind that it ran perfectly before this for a couple days with nothing touched in between. And assuming somehow it COULD have just simply shown it's mal adjustnments after a couple days of perfect running, does it sound like too small a main jet?

thruxtonone · 09-13-2005, 11:39 AM

Does sound like water in the gas. Try a can of dry gas. Make sure none of your vacuum plugs at the carbs came off. It will run leaner on a cold day but what you are describing sounds like more than that.-good luck-T1

09-13-2005, 11:50 AM

First thing that comes to my mind is something that happened to me on my 01 bonneville - check to be sure all your vaccum caps are in place - I had one pop off while riding one time, and it acted a lot like you have described. Also check for leaks around the intake boots where the carbs attach.

Hope that helps....

dazco · 09-13-2005, 12:15 PM

Just checked....no rubber probs. All hoses and caps ok. But what you said thruxtonone sruck a note...."it'll run leaner on a cold day". What i'm thinking here is that if the jetting after pipes and snorkel removal is borderline too lean, maybe the cold weather this morning put it over the edge? Maybe i DO need bigger mains, ya think? After all, it's said they run lean as stock, and now with pipes and snorkel removed it should be running even learner right?

Radiator · 09-13-2005, 12:31 PM

Try pulling the fuel line off the carb and see if it appears to be flowing well.

If it doesn't then your petcock has an issue (of course)...take it off and make sure there is no crud on it.

If it flows well, then the little in line filter might be to blame....do a search to find out how to get to that.... :hammer:

asphyx9 · 09-13-2005, 12:36 PM

I think that is the case Dazco. I consider myself sensitive to the way my engine runs, and I do know that my Thrux runs different when the "atmosphere" is different. My bike will even warm up at a different rate as the weather changes.

I guess that is why fuel injection exists, to have a fuel system that adjusts to all of the inconsistencies of weather, environment, etc.

bog_rat · 09-13-2005, 12:40 PM

Daz, sorry to hear about the problem. I hope it hasn't got anything to do with those pipes you recommended to me that are now on their way from NZ! :-D

No seriously, from what you are saying it could be poor quality/watery petrol. It ran fine untill you switched to reserver right? On the same cold morning? A slightly colder than usual morning should not make much difference.

Your symptoms also sound quite similar to a problem with the TPS that WA53JHO and my self have had (see here).

dazco · 09-13-2005, 12:49 PM

Guess i'll just wait till the ride home before i over-think this. If it runs normal then, then i'm sure i can chalk it up to water in the gas or the cold weather. In the latter case i guess that means i should go up a single main jst size, and in the former it would just be something that would right itself as i run the tank out. If it DOES do it on the way home, then i'll start worrying.

Shorty · 09-13-2005, 01:36 PM

daz...not to start anymore "paint in tank" threads. Radiator's thought on the petcock might be right-on. I had one which was gunked-up at the strainers. Take a strong flashlight and shine it into the tank and see if you have any garbage in there.

Shorty

dazco · 09-13-2005, 01:43 PM

Thanks, i'll remember that as a possibility, but my filler neck sure doesn't seem chipped at all.