Fmf q4
I have a 2012 klx with no performance mods done until today. I finally put on my FMF Q4 that's been sitting here since March. The last pipe I put on a bike was in '74 on my 250 F11. Of course I didn't get the gains from this slip-on as I did with the expansion chamber back then. I was debating and researching the install because I really don't want to mess with the jetting. It was really nice to ride a bike that didn't sound like a sewing machine. Love the sound and seems like much better throttle response. The install was very simple and couldn't be happier with it. If I can stay away from rejetting I would like to add the Powerbomb. I ride mostly street and back roads so I don't think I'll be making any more mods.
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If you're going to add a header you might as well open it up and rejet. Then you'll have something a little more noticeable.
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I am not carburetor savvy so I really don't want to rejet. Can I add the header and not rejet? I don't want to run too lean and ruin the engine.
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This is a good bike for becoming carb savvy. Very simple and it's a crime to not rejet ... even without a new exhaust.
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If you have fitted the Q4 you are lean already
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Call FMF see what they say as they'd be the experts for that one. On my bike the stock jetting was spot on with a powercore4 added, I jetted before the powerbomb when I changed the airbox, but if you left the intake side stock it might be fine. The powerbomb made no issues with the jets I had in before the swap.
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Originally Posted by linkin5
(Post 498696)
Call FMF see what they say as they'd be the experts for that one. On my bike the jetting was spot on with a powercore4 added, I jetted before the powerbomb but if you left the intake side stock it might be fine. The powerbomb made no issues with the jets I had in before the swap.
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Honestly, if you buy the dyno jet kit, it will come with instructions on how to do your rejet and it is fairly simple. I think the hardest part is just taking the carb out and then back in. Rejetting is the easy part!
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if he reads the Signatures of people he can get a really good idea on the carb setup
my Q4 is only 86 DB |
My Q4 has tested at 96 and even 97 dB once. For crying out loud it says 96DB right on the muffler. You didn't get 86. I like the sound but at times wish there was a god way to bring it down a bit.
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