It runs-But I have my Questions!

[skatrdude20]

Alright guys. I have a 2001 440 that I completely built myself. Its got a Namura 440 Kit, HD Studs, 450 Timing chain, Uni filter, 450r Carb. All the good stuff. Well I bought this POS Sparks pipe and fixed it up to the best I could. Got a new cap and core and newly packed it. Well I started the bike up today and it idles, but it pops while it idles. It`ll stay running but it`s like pop-pop-pop-pop-pop. It also smokes pretty damn bad. As well as if I put my hand behind the exhaust pipe, I can REALLY feel the exhaust coming out on my hand, I mean HARD.

Any suggestions as what to do, jetting, or what?

[lorenjr83]

i would of stuck to the stock carb for the break in. the 450 carb can be a joke to jet. it takes alot of messin with.

is your smoke blue or black?

[skatrdude20]

Well I dont have the stock carb, and the smoke looks REALLY white to me...

[skatrdude20]

Also, bike will sometime run for a minute, idly popping pretty hard, then REV up really high WITHOUT me touching it, and then pop and die. Any suggestions?

[skatrdude20]

Anyone?

[CSR400EX]

sounds like jetting to me. what size jet are you running?? i had that exhaust on my 400, stage 1 cam, 11:1 440 kit, rev box, pro flow adapter, and i was around a 180 or so.

[boosted3g]

as cold as it is you should be one around a 55 pilot and it throw in a big main like around a 190-200 for break in. Move your needle up if you havent already. The 450r carb is an awesome upgrade and i would keep it on for sure.

[86 Quad R]

sure sounds like a jetting issue. the pilot jet and adjustment is lean it sounds.

[Phillburt57]

I remember when my Eichner carb did this and it was a combo of the jetting and Idle screw. Once I got those dialed in it ran great. Play with your jetting and Idle and it will all come together once it's right.

[REDRIDDER]

Just a thought but the air box intake tube isn't leaking air is it?

[skatrdude20]

Its possible it could be leaking, I`m going to have to check that,right now I think I have a 200 main, and a 50, MAYBE 52 pilot. What should I throw in to start, and also what should I set my needle at?

the rev without you touching it is a sign of running lean. Also the popping i would bet on it because its running lean. Get a different pilot or adjust the A/F screw (not sure if the 450r carb has an air or a fuel screw)

[michaelj]

mine was running hard on idle like this to when I put the 450 carb. on -the throttle cable was pulled super tight and it was stuck in 1/4 throttle I just loosened it up with the nut adjustment