So i have a 2003 ls650 and all year long running like a champ. So i put on a k/n cone filter and open jardine exhaust on it, so i re jetted the card with a stage one kit. So last week the battery died on me so this week i put in a new one. The first day it ran like new, the 2nd day it's sputtering, barely ideling and bleching black smoke, and when i took it down the highway at one point it was shooting flames. I did notice the fuel line when i touch it feels as if it's surging. I tested the peacock it's fine, the carb just got rejetted at the start of the summer, and i exposed the air/fuel mixture adjustment and moved it no help there.  It gets worse as i give it more throttle. Please help i miss riding!  :'(

With the peacock i pulled the hose off and plug it and the carb and it didn't run any better and that was pulled from a thread on here is there any other way?

If the petcock is working properly and in the "run" position, when you pulled the vacuum hose off the petcock should have stopped fuel flow, so the engine should not have run at all.  It should only run in the "prime" position when the vac hose of off.
Since it did run with the vac hose off, then that indicates there is something wrong with the petcock.  Have you tried running in the prime position with the vac hose off ?

Yeah it's running SUPER rich the inside of my muffler looks like it has been black powder coated. I ordered a raptor peacock just in case the bike's not staring anymore to check on the peacock again  

Another way is to just do the petcock mod.  Make it a manual instead of the god-awful vac one.  I would have spelled vacum...but I don't remember how.

Toymaker wrote on 09/06/09 at 14:07:11:


Vacuum, sorry no cool pictures for the sucker.