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Jetting suggestions?

2K views 8 replies 8 participants last post by  Geoff 
#1 ·
Springtime mod time is approaching rapidly. Last year was cosmetics and suspension; this year will be engine breathing. That is to say, mainly, airbox removal.

Here's the thing though: my Bonneville's a 2001 and came with TORs on it when I bought it (two and a half years ago). The perfed pipe inside the TORs has started rusting out, and the pipes are definitely louder and deeper than new TORs.

With the pipes flowing a little more freely than new TORs, presumably the suggested jetting for ARK + TORs would be a smidgen too lean. Also, I picked up a pair of Thruxton needles, since most people seem to prefer them -- which is not to say that I have to use them, just that they're available.

So, what carb jetting do you guys think I should be looking at? (By the way, Dinqua's jetting calculator doesn't work for me because it's a PC app, and I have a Mac.)

(FWIW, I plan to add Predators eventually, but can't squeeze them into the budget yet.)

Thanks in advance.

--mark


[ This message was edited by: markbvt on 2007-03-20 16:47 ]
 
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#3 ·
150 mains come with the NARK and NH Togas--I have no idea how much less restrictive the TORs are compared to the Togas. If it were me, I would start with 145 mains and be prepared to go up if needed. The 790's seem to run larger main jets than the 865's when the airbox is removed. With the NARK and NH Togas, I am running 158 main jets--set up on the dyno. I recommend getting it on the dyno after your mods.

Larry
 
#4 ·
#7 ·
I'm at 150 mains, 42 pilot, stock needles shimmed 1, "D" screw at 1-1/2 turns with ARK and 904 stuff. Runs good at breakin speeds right now. I'm waiting for the engine to loosen up a bit and try the Thrux needles as a backup measure. Most folks who use the Thrux needles really like them.
 
#8 ·
If you have not removed the airbox...then pull the rubber side snorkel out and run 125 main jets...the other posts with jets over 130 to 150 are for full pods with the airbox removed...and would be way to rich for the airbox still in place...if you did not pull the airbox use 125 mains.
 
#9 ·
Kliff, while all of Pats stuff is informative, the jetting calculator is primarily 270 deg phase motors.
it will put you in the ballpark, but once again you have to fine tune for your particular application
G.
 
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