Triumphrat

ondrew

its been a while since ive posted about my bike, but here is the story so far.
i got my bike one day later than they promised it to me, and only because i demanded it. While i was waiting forever for my bike, i decided to order new exhaust and the airbox removal kit from BC. the dealership also installed that and rejetted. BUT...the bike now runs like crap (almost worse than before) and i only get 25mpg. the dealership told me they had to oder another needle they didnt have in stock, and i will have to come in again to get it installed. The dealership has been a lot more helpful, and better with communicating with me, but my brand new bike still runs like crap, and im not too happy about that. i also posted the dyno results. i wanted to ask you guys what you thought about them....they seem a little week to me.
thanks!!

andy

Attached Images

dyno.jpg (57.2 KB, 28 views)

Kirkus51

Well, you should have more HP and your bike should get at least 40 ish MPG. I'm probably one of the biggest guys here and I just calculated a refill on my Black and it worked out to 51mpg. I was amazed as my bike is pulling a lot of weight and although I don't hod rod all the time I do have a fun time getting up to speed as fast as I can. I've got he AI removed and TORs (Triumph Off Roads). Not even sure my carbs have been rejetted. But it starts and runs just fine. Has never missed a beat.

Holyman

ondrew can you define "runs like crap" as that doesn't tell anyone anything?

what's wrong with your dyno results? they look pretty healthy to me. 55 rwhp (albeit on a DJ dyno) is pretty healthy. what did the dealer do wrt rejetting? sounds like he is going to fit a thruxton needle now, from what you've said. imo you're running a little lean until the slide is wide open, so you could add a shim under the needle or fit the Thrux needle and try it again.

have to agree that 25mpg is not right.

ooooohhh just looked at yor dyno chart again. Is that SAE correction factor of 1.17? If it is then the numbers are total lies. It's probably reading 10% high.

Flyingscott

You are dissatisfied with the shop yet you ordered somthing else for them to install? I guess you did this without asking someone what would be necessary for the installation and/or assumed the shop would have everything needed for something you ordered from BC? You have an engine that is running poorly but you decide to add another variable before the initial problem is resolved?

The shop may have "a" problem but your decision making is "the" problem.

Look at the process of consideration you used to buy this used bike-did you have it professionally inspected by someone other than the seller? If not, you should have. Does your state have a lemon law and do you know what it is and how to use it? Are you aware of Federal protection standards for consumers on purchases? Do you make used of any of these options?

Why would you have a shop you are not satisfied with install anything and especially something that changes engine performance before the initial problem was solved?

I am not implying you are incapable of thinking through this but I wonder if you are willing.

The reality is that this kind of problem is that it is going to repeated over and over again until you critically assess your thinking and judgment on this problem.

Prudence calls for being very, very careful when buying used vehicles which should include having an independent inspection, a reasonable number of miles to insure it is OK, knowledge of what your legal rights are and never ever put up with poor service from any shop. Always have the shop put in writing what the problem is, reason for delays and what the plan to do and when.

This is not about being a hard ass, it is about dealing with issues like this in a professional and businesslike manner to the benefit of all concerned. Most of us have learned this through experience and I hope that this situation serves the same for you.

My advice at this point is to sell the bike for what you can while clearly and honestly disclosing to the buyer what problems you have had and take your loss and move on. A rider with good mechanical knowledge can resolve these problems and probably would enjoy the challenge so I'd try to find that kind of buyer.

I am not convinced that the changing of air-boxes in any vehicle does anything other than cause problems with modern electronic control of engine operation.There's pretty good independent data on this on the net.

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ondrew

i can see your point flyinscott. im a trusting person, and i probably made my decision to quickly on trusting the dealership on installing my BC parts, and listening to their advise. But i disagree with your opinion that the owner of a bonneville needs to have a "good mechanical knowledge" in order to enjoy his bike. im not trying to pretend i have any sort of mechanical knowledge on these bikes, but i LOVE my bike anyway. I just dont think its too much to ask for a triumph dealership mechanic to make it work like it should.

thank for the help holyman. my definition of runs like crap: there is no power in 1st gear, very slow start off. Any time im trying to keep a constant speed, mostly in 3rd @ around 45-50mph @ 4000rpm, the bike tugs really badly. i dont know how i can explain "tug"...the engine just doesnt run smooth at all. ive only put about 150 miles since i got it back last, and the problems seem to get worse the more i ride it.
and yes the SAE is 1.17. honestly, i really dont know what most of the numbers on the results mean.
thanks for the help again!

amanger

Has the previous owner fitted a 19 tooth front sprocket?

The way the torque and power line goes all wiggley at the end sort of hints at the A/F ratio not being so great.Its a bit hard to read.

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rodburner

When I had my bike dyno`d,the operators used an SAE of 1.18. and I was totally pumped about 72hp/55lbs torque.But after reading up on it and a ton of good natured ribbing,I asked Jojie to re-figure the readings using the real factors and it came out to almost 20% OVER actual. I was a little upset,but probably not as much as some of the other guys buying $1000s of dollars worth of HD performance items that day,questing for their magic 100hp reading.It sounds like your "runs like crap" is still running on one cylinder,atleast part of the time. Your bike might not run perfectly with the "wrong" needles in it,but it will still run better than "like crap".

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Holyman

your hp and torque figures look realistic.

it looks to be running lean to me, which is why you get surging. this is why the dealer is looking to fit Thrux needles, as they are more tapered and allow more fuel to flow before the slides are fully open.

the higher the a/f ratio, the leaner the mixture. 13.7 gives maximum power.

I would expect an honest dyno to use a correction factor between 1.03 and 1.07, but to be frank, unless you have a before (stock) and after dyno run the only thing worth looking at is a/f ratio. A correction factor of 1.17 is boosting your figures by (quite) a margin.

Also, be aware that removing the airbox on CV carbs will lead to rough running as CVs are very intolerant of turbulent air.

My opinion is that you would be better off putting the airbox back on.

It is quite possible that you have the pilot screws a long way open or too big pilot jets fitted to try to compensate for the lean running at lower revs. This will increase fuel consumption enormously.