Im looking at getting the new HMF comp series exhaust full system with a K&N airfilter and power lid and was wondering what kind of jetting im looking at? :help I live in Utah at about 4200 ft. Thanks
flyinonice55
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Actually when I went with an aftermarket exhaust I went up on my main jet size. Stock is a 130, I went up to a 155. and I went with a 25 pilot jet where the stock is a 22.5. Im not very good with the altitude conversions though. With a pipe, you take your airbox lid off to dump more air into your machine, with more air your going to want to dump more fuel, thus giving you more power with the right air to fuel mixture, and all of which is escapin through your newer high flow pipe. I will say though I am not a fan of the K&N filter or the HMF pipe lol. The pipe is super loud, but its up to you and how you ride. Also your going to want a new needle and E-clip, and I was running the 3rd notch down from the top with the eclip on the needle and I turned my fuel screw 3 turns on the carb.
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I talked to a motor builder who is a good buddy of mine because when I bought my alba pipe the "experts" at Alba said to run my carb like this. So I did and my machine ran like a bat out of hell, there was fuel in the pipe causing it to backfire a little and shoot flames on deceleration. But after I installed my big bore kit I upped my main to a 180, and started tweaking but like you said, I couldnt find the results I wanted. and I started having problems with my clip in my diaphram in the carb literally blowing it self apart and the needle becoming loose causing my machine to idle fine but would bog as soon as I hit the throttle and was running like the choke was on. so I set it back to what my buddy told me, and what the folks over at Alba suggested for a race machine. and it was fine but just couldnt get the results I wanted from my BBK. So I took the carb off and odrered the Edelbrock carb. I would never keep a stock carb on a machine as long as I live after seeing what this carb did for me. Here are a couple pics of the new carb, lol you can see by the fuel line how much fuel I am dumping into my motor now lol, I go through so much gas now, I would be lucky to get 20 miles out of a tank. When I was stock I got about 65-75 miles per tank. You should try that combo out on your DVX with the jetting I was talking about in the post above, makes a huge difference with a pipe!
[attachment=147081:006.JPG][attachment=147080:SSPX1346.jpg]
[attachment=147081:006.JPG][attachment=147080:SSPX1346.jpg]
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NO I use my stock tank, we only run 4-5 laps on a Motocross track and the track average is 3/4 to 1 1/2 miles long. I fill my tank about a 1/4 full before every race and I always have enough to get me back to the pits but not much more lol.
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<div class='quotetop'>QUOTE (lakia_dvx400 @ Feb 5 2010, 06:34 PM) <{POST_SNAPBACK}></div>
Yep I did the same thing, a little black knob on the carb itself, pull out to choke, push in for no choke, super easy, way better than the choke on there, and its a cheap part too
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Also make sure the cable isnt getting suck or hung up on anything, sometimes if it is tight somewhere when you turn the bars it will engage and disengage the choke
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