Triumphrat

boboso · 12-24-2006, 12:59 PM

First thanks to all who provided some feedback in my original post (LINK).

I have since installed 144 mains and the bike seems to like this much better. One thing I have noticed is how it now comes on at around 6-6500 rpm at full throttle. At first it seemed that something was amiss, but it ran strong and smacks the rev limiter almost faster than I can react to it. I was wondering did I go to high in the main, but according to Pat's calculator I actually should be at 148s or so. I had it at the dealer (hanging out) and one of the mechanics took it out and wanted to know what I did to the bike, he was impressed and wanted to get the details.

Questions:
1. Is this a normal act at this RPM (6k-6.6k) for the engine to take off at WOT? It really does open up, almost like my old FZR and such when they got into the upper rev areas (think turbo like).

2. It seems a ingnitor box may be in order to give me a bit a an advance in timing and especially the extra revs as it seems it still wants to go. Are these boxes mature enough yet? I have done the search and it seems they are hit and miss (Procom).

Bike set up:
Triumph 05 Thruxton - AI removed, TORs, NARKd, Emissions removed, 144/42 jetting with one shim (thruxton needles natch)

RedBird · 12-24-2006, 01:16 PM

1. I would say yes--at least my 790 really comes on around 6K rpm. I had to get an igniter with a rev limiter set at 8100 in order to get my shifts in prior to hitting the stock 7400 rpm rev limit.

2. I personally would not yet consider the Procom igniters. Send Jojje an email and see if he will modify your stock igniter's rev limit. I also would not consider advancing the timing for the stock igniters--Jojje can also do this if you desire. IMHO the stock igniters are much better, and Jojje seems to be doing a few for US customers again!

Larry

FattRat · 12-24-2006, 01:42 PM

(Larry, We ought to restrain from volunteering Jojje's services (for him) as there are extenuating circumstances, legal issues, and "history" not openly discussed. Jojje has his reasons for politely declining from hooking a brother up, and I respectfully understand fully what they are and to whom they are applicable. Besides, the recent posting of a gentleman who lost his igniter via the mail system is NOT that unusual in that part of the world, and it would be VERY cost prohibitive to declare the value and dish out the bucks required to cover it and therefore also to mail it correctly.)

===========================================

Given all that I have been apprised by Jojje himself, I might suggest that a viable alternative is to take a chance at a $99.00 bid on ebay for the Procom. Or of course to dish out the $200.+ to the local distributor who will stand behind HIS igniter (also a Procom?).

Yo 'boboso',
Regarding jetting, the butt-dyno can tell only so much...... but I have read of plenty folks running 155's with your set-up. My recent experience though has taught me that EVERY carburated twin, two cylinders especially, are unique and have their own set of circumstances and how they react to the environ'. I say stick some larger jets in there, and if the bike runs like a scalded cat when the engine is cold, then tames down after a half hour in the saddle..... you can conclude that you're now running too rich. Stick some smaller jets in there, THEN get it sniffed for an air/fuel ratio reading.

With regard to the shim, leave well enough alone until you've found the main jet that seems closest to THE one. Then if your bike stumbles right between on-throttle/off-throttle upon giving it slight gas... THEN add a shim to richen the mid-range. And the Thruxton needle should NEVER need more than one shim, some may insist that they don't need even one shim, but I beg to differ based on my experiences.

Ain't if fun though!

[ This message was edited by: FattRat on 2006-12-24 11:43 ]

boboso · 12-27-2006, 07:02 PM

Quote:

On 2006-12-24 11:42, FattRat wrote:
take a chance at a $99.00 bid on ebay for the Procom.

Yeah it's fun, but so is riding! I looked on eBay for a Procom unit based on Jojje's reply to me over at Triumph Perf forum but all that is available currently is the 790 engine (I think) as it states T100 01-04. I'll keep looking as Jojje said "go for it" and I agree, I do not wish to place any liability or issues on others, I'll roll my own.

On the jetting, yeah I plan on getting it dyno'd one day, and my seat of the pants dyno does pretty well as I used to road race. It is just the differance in jetting from 128 to 144 really changed the nature of the bike. It hits 6 grand at WOT and slaps up against the rev-limiter very quickly and the ton comes up quicker as well. I am going to try a high speed run this weekend to see how the top end works out. I am not too concerned with top speed as I am with corner speed.

Geoff · 12-27-2006, 08:12 PM

One thing to remember is that Pats calculator is geared toward the speedmaster and america, which have slightly different requirements to a 360 motor, if thats what you are jetting.
otherwise, just ignore my altered state ramblings
and carry on as you were
G

boboso · 12-27-2006, 09:12 PM

Quote:

On 2006-12-27 18:12, Geoff wrote:
One thing to remember is that Pats calculator is geared toward the speedmaster and america..

Thanks and that is a known. I think I am in the ballpark now with the 144s, though the NARK kit came with 128s which felt okay as well. However the 144s seem to open it up when the bike hits 6 grand. As stated from others, to each his own and pending altitude (I ride sea level to 7,000) as I have heard 155s to 128s...

Gotta getta dyno...

HiVel · 12-27-2006, 10:34 PM

I am running 135 mains and stock needles , 42 pilots and 2 1/2 turns out on the air screws. This works great for me and my Bonnie. - 2005 T100 (865cc) with NARK and D&D pipes. Procom box, K&N filters, hot coils and super wires w/ Iridium plugs. Runs great . Geared up to a19 countershaft. I might try some fatter mains but do no think they will give me any more go. Lean is Mean!! (until it blows)