View Full Version : Help with Blast exhaust/carb


Luckymic
22nd December 2004, 03:28
I just installed a new Vance & Hines exhaust system on the wife's Blast. Took it for a little test ride sounded great seemed to perform good. When I got back to the house (about 1 mile later) the pipe had noticably blued and I could smell what seemed like burning metal. I also installed a new K&N air filter along with the Vance & Hines performance jet kit. I did everything word for word on the instructions. I backed out the mixture screw 2 turns, do you think this could possibly be to far out (this is what the instructions said to do. I'm not sure what I could've done wrong to lean the engine out except for that. Any help would be greatly appreciated.

BTW: I can type out the rest of the instructions if anyone thinks it'll help.

Mark_Bench
22nd December 2004, 13:47
sounds like you are running it lean, probabally have to jet it up
here I get this off another site
"For technical information and discussion of Buell P3 BLAST!
Engine Carburation and fuel delivery systems and their repair/maintenance/upgrades.

Stock Jetting
2000 - 2001 42/165
2002 - 2004 42/170

For After market Exhaust without 1 3/4" ID Header-
With or without intake alterations :

Below 3500 Altitude - 45/170
Above 3500 Altitude - 44/165


For Aftermarket Exhaust with an exhaust header of 1 3/4" ID
and a hi flo intake/Modified Stock (not stock)Intake :
Below 3500 altitude - 45/175
Above 3500 altitude - 44/170
(For Kerker exhaust which has a 1 5/8" crossover)-use ONLY a #165 mainjet)

Carefully remove plug over idle mixture screw (drill it out carefully)
and reset idle mixture screw to 2 1/2 turns from fully seated- for best
idle speed. If best idle is more than 3 turns out, switch to a 48 pilot
jet and re-adjust idle screw for optimum idle.

Shim the needle a little higher (~0.01".

The best course is to then to run your bike on a dyno equiped with a
wide band oxygen sensor (air/fuel meter). Optimum safe high performance
WOT A/F ratio is between 12.5 and 13.5. Anything over 14.5 is
excessively lean and risks stressing/overheating your combustion chamber.

Please Note: You cannot run an aftermarket intake (even the Buell Pro
Series) without bracing the carb in some fashion - Most recomend springs,
one each side of the carb to the head (yes - 2 holes would need to be drilled). Thank you "

Luckymic
22nd December 2004, 17:59
This is what the instructions said:

Install V&H main jet provided. Use the BJ170 main jet with a ompletel stock bike. Use BJ165 main jet with an aftermarket exhaust. Use the BJ160 main jet with aftermarket airbox. Use the BJ155 main jet with an atermarket exhaust and airbox.

-This sounded assbackwards to me, but I did it anyway because it's what the instructions called for. I dont have an aftermarket airbox, but I do have the K&N airfilter, so I went with the BJ155. I'm assuming that's a 155 jet. I also enlarged the slide lift hole, Installed a new needle and spring, and emulsion tube. Then I drilled out the plug over the mixture screw, turned it until seated, then backed it out 2 full turns.

I think I'm going to give the tech line a call.\ :frownone

Mark_Bench
22nd December 2004, 19:56
sounds like you went smaller on the jets that can't be right!

Luckymic
23rd December 2004, 00:35
Well I gave the tech line a call and they said everything sounds good to go. I guess what I was smelling was the fiberglass packing on the inside of the canister. They also said the pipe will blue. I said yeah I know it'll blue over time, but damn in a mile. I got a schpeal about how it depends on the chroming and blah blah blah. I'm going to take it for another ride tomorrow morning and see if it gets hot or if it acts up at all. I'll probably pull the plug, clean it up and see if I can get anything from that too. Thanks for the help.

Mark_Bench
23rd December 2004, 13:38
Just souns weird to me, my wife has a blast just did the kerker pipe and jetted up to a 45 main and a 165 high jet and shimmed the needle...the plug looks good, might try to pull the plug and give it a check...