450r carb trouble

[exrider87]

Ok here goes. I put a 450r caarb on my 416, stock 48 pilot, needle on the tird clip and a dynojet 170 main. The thing will not fire at all unless you hold it about half throttle then it will start, but it spits and sputters and blows black smoke like its running wayyy rich. So i put in 42 pilot 2 1/2 turns out on the a/f screw an second clip from the top, still does the same thing. The only way it will run is wide open throttle. I've checked the float needle and the accelerator pump, both look good. anybody have an idea how to make this thing run?

[Ruby Soho]

is the hot-start plugged and sealed properly?

[exrider87]

I believe so, I just left the cable hooked up for now.

[exrider87]

Can any one help me out here???:confused:

[zrpilot]

Make a very close inspection of the carb, look for things like the following:
1) re-check the hot start!
2) re-check the float level
3) make the anti-splash shield in the float chamber is installed correctly
4) make sure the main jet has not become loose
5) switch to a keihin 170 main jet
6) otherwise I dunno .... take the carb out of the bike and CLOSELY inspect EVERYTHING...

There are MANY people, including myself, running that same carb and have NO problems. There is something uniquely wrong with yours.