Triumphrat

dazco

i wanted to start a new thread to get as many responses as possible. But in another thread you may have seen i mentioned a problem during a mornig ride where the bike seemed starved for fuel, or at least thats what i thought. but i know little about this stuff so i'm asking for opinions.

morning ride, cold, and on the freeway after about 5 or 6 street miles. Close the throttle and then open it again to resume and it would hesitate for a split second. let off the throttle and i'd get popping. NEVER had any of this before, never even a single pop on decel.

Ride home after work, not a single pop or bit of hesitation. I do believe it was the cold.

The bike has Tbike pipes and snorkel removed, 3-1/2 turns. Runs like it's being chased by the devil. Much quicker than stock and not a single indication of anything other than perfect tune, EXCEPT during that cold morning ride.

My thinking is that if it did this in cold weather it could be towards the lean side with the pipes and snorkel off, and knowing the bikes are lean as stock, maybe they're now on the border where any more and the problems i decribed arise. So my questions are, should i rejet, if so just mains or what else, what size? Stock mains for the 05' speedy are 120. What do ya'll think?

bog_rat

Daz to be honest I don't think it's the cold that's doing it. You live in CA, I live in England. I doubt if your mornings are as cold as ours!!!

The other day you had a great setup, so I would recommend testing, and using that new tank full before you start making more work for your self. From what you described it does sound like dirt in the fuel.

Rejetting might not be a bad idea with the snorkel off and those new pipes, but it may not have anything to do with your current problem - IMHO

dazco

Well, yea. It may not. But the question isn't just "do you think i should rejet because of thae problem", but more like do you think i should with the pipes and snorkel off, and i mention the problem because it could possibly be an indication that i need bigger mains or something. Granted it wasn't very cold......certainly not like your area or MOST areas. But the point is that it's the coldest i've riddin in to date and if the jetting is on the edge already maybe that could have been enough to put it over. i mean, after work it rode like a champ again in 20 degree warmer weather.

So i'm looking more for opinions as to whether ya'll think the pipes and snorkel removal would likely require rejetting to put the bike in a proper state of tune. Considering all the talk about the bike being too lean from the factory, wouldn't pipes and snorkel removal likely put it in a much too lean state? trust me tho..i really don't want to have to rejet ! But at the same time if i think the bike needs it to be in proper tune i'd bite the bullet and do it. i just need to get as many opinions as possible and see what the general consensus is because you all know more than me about this. in fact, i came to believe this may be necassary from what i keep reading here !

bog_rat

Daz, I found it hard to believe the tbike claim that no rejetting is necessary, but if that's what they and others claim then I would think they know best. I will get mine soon so I will be able to judge that one better then. It's not an impossible claim though because the tbikes are baffled.

The snorkel off is more likely to require rejetting. Basically if you are increasing the flow of exhaust gasses and air flow into the engine, you need to increase the flow of fuel to match, which you do by rejetting.

There certainly is no harm in experimenting with different jets if you want to find optimum performance, and fancy getting your hands dirty, but normally you only need to bother rejetting if you increase the flow through the engine, and end up with a loss in performance i.e running very lean. By the sounds of it you got a gain in performance. Ask your self this.... if this mornings problem on the way to work has nothing to do with the jets, do you want to fuss about rejetting your carbs to see if you can squeeze some extra performance out of the bike and loose a bit of fuel economy in the process? If yes, then go for it and let us know how it goes.

Best thing to do is run your current setup for a week, then after a long run take your plugs out and check the colour of the carbon deposits on them. If they are white/gray that means the bikes running too lean. If they are black it's too rich. They should be a kind of tan/brown colour. That's the best way to tell if you need to rejet or not.

I plan to get the Freak airbox removal kit in a few months or so, and I will have to rejet for that for sure due to the extra flow of air into the carbs, but with my butchered off road shorties and snorkel removed mines running just fine with out rejetting.

[ This message was edited by: bog_rat on 2005-09-13 21:56 ]

Brooksie

Daz-I also notice similar throttle response (or lack of) when the weather changes. I can usually eliminate most of it by adjusting idle knob up a little. I have the Triumph "off-road" pipes on the T100. I would think synching carbs would help more than re-jetting. The farther away from stock you get, the more tempermental the bike gets. Good luck!

dazco

Thanks BR. Your thoughts are noted and considered. Like i said i really don't want to if i don't have to, so i hope you're right. Of course there's also the thought that maybe i'd gain even more performance. I'd like to hear as many opinions as possible tho.

bog_rat

I forgot to say.... also leave the choke out for a few miles longer on cold days. It will play up if you push it in to soon.

bog_rat

Daz sorry to post again already, but I just edited another reply probably after you read it, but here it is again.... here is how to see whether you need to rejet or not.

Best thing to do is run your current setup for a week, then after a long run take your plugs out and check the colour of the carbon deposits on them. If they are white/gray that means the bikes running too lean. If they are black it's too rich. They should be a kind of tan/brown colour. That's the best way to tell if you need to rejet or not.

Brooksie

Daz-Pipes and airbox (air cleaner) upgrades are on my radar as well. I always noticed problems with jetting when the air box is removed. Constant adjustment (not fun). I think I may go with just the K&N drop in filter with the pipes from Triumph. That should get me to about 65 hp and let me get there alot quicker. Hey, check out the South Bay Triumph site if you haven't already. Lots of engine mods for Bonnies. You can get close to 1000 cc's and close to 80 hp out of the bike. Have fun and keep the shinny side up!

dazco

i did the balancing a few days before snorkel removal and that actually helped gain a bit. But actually as far as the bike becoming more tempermental the more you change it, i have thankfully found the opposite ! Aside from that morning ride the bike has otherwise been better than it was stock in all respects including startup and length of warmup ! i had posted after AI removal and before pipes or anything else that the bike was taking forever to warm up. Amazingly tho, after pipes and mix screw tweaking, balancing and snorkel removal it's starting and warming up so fast it's almost shocking. I pull the choke, start it, let it idle for 15-30 seconds then take off. I push the choke in literally at the traffic light a block away and it idles perfectly ! I never thought that was possible. So in all respects it's fabulous compared to when it was stock even. As to that one incident, hopefully a fluke but i'll know after a few more morning rides i suppose.