Triumphrat

Saigon5 · 04-19-2005, 08:39 PM

Now ready for another dyno run that will happen Thursday.
Current set up. Pilot jet, 38, main jet 138-134-138, Trophy airbox, Speed triple cams. Stock needles.

I did try to put 2 shims under the needles but it turned out to be too rich in the bottom part. Before 4500 RPM, the bike was very hesitant. After I removed the neddles, everything seemed fine. I think that by now, I should be close to the final set up. I still have a little popping on decel from 4000 RPM down but much less than before. That is a problem for me, I like this popping, I may try to keep a bit. Tomorrow I will try to use only one shim under the needles to see if it does a change or not. By the feel of it, I could be richer from 6000 RPM but may end up too rich below.

Thursday will tell. After this run, I will try to solve the electrical problem, this ***** bike is running on 3 cylinders only.

fbird · 04-20-2005, 07:56 AM

Been looking forward to your update, Great to see its progressing.
Have a quick question, why are you using a 134 jet on the center and the 138's on the ends? Seems like big difference. Is the airflow to the center carb that much lower?

Saigon5 · 04-20-2005, 09:18 AM

From previous reading, it seems that most "jetter" put a smaller jet in the middle. I think that for me to know the thruth, I would need an analyser plugged on each cylinder. No such thing available here to my knowledge.

I am going from a mix of reading on previous experience and what the dyno guys says and what I think. At this point I can say that 2 shims was too rich. I may try only one shim today as I have the feeling that I am a little on the lean side at lower RPM.

I will know more Thursday.

MickMaguire · 04-21-2005, 10:14 AM

Quote:

On 2005-04-20 07:18, Saigon5 wrote:
From previous reading, it seems that most "jetter" put a smaller jet in the middle. I think that for me to know the thruth, I would need an analyser plugged on each cylinder. No such thing available here to my knowledge.

If you fancied a good long ride - Great Bay in NH have one IIRC.

Saigon5 · 04-21-2005, 10:40 PM

[/quote]
If you fancied a good long ride - Great Bay in NH have one IIRC.
[/quote]

I do a few time a year but every time I went by they were closed. Actually my real riding season opening ride is to go around Hampton Beach. May be one time they will be open.