[caspianthruxton]

Ok, so i cut up the air box last night and slapped in a couple of K&N's. Then i retted to 155 mains because that's what the pats jetting calculator told me to do. I've been getting my money's worth of my D tool and have wound up about 3 turns out and i'm getting less power at all RPM's. Especially the higher rpm's. It seems like it doesn't want to go near red-line. I thought about putting a shim under the needle's, but thought i would ask everyone's advice first. Do i need to try some smaller jets?
'06 Thruxton
Epco stainless exhaust
K&N single filters with air box removed.
155 main jets.

TJ

 

[bsmith222]

You're way rich. Try going down to 140 mains.

-brent

[ This message was edited by: bsmith222 on 2006-12-10 16:54 ]

 

[Mecchanica]

If, at full throttle in third, fourth or fifth, you roll off the throttle slightly and you accelerate, then the jet is too large.
Start too rich, and work lean. Use your plugs as your guide, and master the art of the plug chop....shut the throttle as you hit the kill button and pull in the clutch after running the warmed up bike under load for fifteen seconds in the range you are checking, while coasting safely to the side of the road. Pull your plugs and analyse the color.
Start with the mains and work back toward idle.

 

[caspianthruxton]

thanks guys. Brent. i went ahead and ordered the 140's from you. Thanks again. I couldn't find shims on there though.
TJ

 

[bsmith222]

Thank YOU, TJ!!

-brent

 

[caspianthruxton]

No problem. You guys have been very helpful with everything. By the way. i got those Bonneville Ikon's that we ordered put on last night and i love them. thanks again.
TJ

 

[sweatmachine]

Try 42 pilots, or 45s, one shim on the needle, and it sounds like you know which direction to go on the mains.

Mine has 155s and it runs perfect. Strong all the way to redline, very strong. Maybe there's a difference between the epcos and predators?

I'd try the 140s, and maybe some 145s, but remember the main is only used at full throttle.

I think you need a shim.

 

[caspianthruxton]

where can i order the shims? are you only running the 155 mains?
TJ

 

[bsmith222]

TJ - I just saw that we don't have shims on the Thrux page (I'll fix that right away). If you want shims, let me know and we'll make it happen.

Thanks again!

-brent

 

[sweatmachine]

what do you mean by am I only running the 155 mains?

My setup, 42 pilots, mixture screw 1.25 turns out, 1 shim on thrux needles, and 155 mains.

Runs great, strong everywhere. I have the BC airbox elim and the predators.

 

[caspianthruxton]

Brent, can you add some shims onto my order? Are the stock thruxton pilots 42? Sweatmachine, i was just wondering if all you had changed was the 155's. I imagine our set-ups are pretty simialar.
Thanks for everyone's help. This is why i love this site!
TJ

[ This message was edited by: caspianthruxton on 2006-12-10 19:38 ]

 

[sweatmachine]

my pilots may be 45s, I can't remember. If the stock pilots are 42s then mine are 45s.

 

[caspianthruxton]

awesome, and the pilot jets help the power in the upper RPM's right? so instead of new mains i might want to try and put a shim on the needle and up the pilots?
TJ

 

[sweatmachine]

pilots are low rpms, like the idle mixture etc.

 

[caspianthruxton]

ahh, gothcha. so what RPM range does the Main's and the needles effect? Sorry to ask so many questions, but i want to make sure i do this right.
TJ

 

[sweatmachine]

here's a lil' help:

CARB HELP

 

[sweatmachine]

 

[caspianthruxton]

awesome. Thanks again.
TJ

 

[sweatmachine]

no prob bob, you'll really thank me when you get it tuned right and open that ***** up!

 

[caspianthruxton]

i can't wait. just putting the exhaust on was a hell of a change. Hopefully we'll get a couple more nice days that i can test her out when i get it dialed in.

Brent, i sent you a PM about my order.
TJ