mikuni 34's

[bansheemike51]

O.K. I've read all the forums and can't find any help to my question. I installed the Vito's 404 big bore kit and also installed a pair of 34 mikuni's. They have 55 pilots and 270 mains on the middle needle groove. I ride at about 2000' and most times about 70 degrees. I'm using a Vito's hemi head with 22cc big bore domes and K&N clamp on filters. I need a ball park figure on the jetting during break in. Some ball park figures apprecated.

[Ducman]

I have a 4mm dune port stroker that I've recently broke in and I'm working on the process of getting the jetting dialed in. I'm running the Mikuni TM 34mm Flat slides, stock airbox lid off/ foam filter. I started with #35 pilots (air screws 2.5 turns out) needle middle clip and 280 mains. The carbs came with #50 pilot and #280 mains. The needle that comes on the TMs seems to be way to rich. I droped it to its lowest setting and it helped a lot. It was bogging prety bad on the needle in the middle clip position and now its runs decent, just seems kind of week and when you go to wide open throttle it hits the band real light switchy. The plugs are also dark black and oily. The mains seem like they are not too far off, maybe a little rich, same with the pilots. I am geting a 2 steps leaner needle jet (orifice that the neelde goes into) to lean out the needle alot more. This is what moto carerra told me to do first before messing with the needle taper, length and leaner/richer needles.

 

I would recommend to start with a 30 or 32.5 pilot, needle middle clip, or if you got a new set of the TM 34mms like I have go straight to 1 or 2 steps leaner on the needle jet orifice, and run the 270 main that it came with. That should get you close to where you need to be and it'll run half decent.

[03 ORANGE SHEE]

as you can see from the pic and my sig, i run 45 pilot , clip all the way up,520 mains or .188 drilled for alky

[flea49]

Ducman i am running the same carbs and having the same problem i droped the needle down one clip and mine runs fair,when you get the leaner dump tubes installed could you let me know the number of the ones that helped.thanks.

[Oilsmoke]

I am running some Old school Artic cat pre Vm model round slides

I am little rich 1/4 to 1/2 throttle in hot weather at 4300 feet.

270 mains

1st clip

needle 6dp17 ( rich snowmoble ) need to change for a leaner one.

needle jet Don't know.

35 pilot

slide is 2.0 Little rich But i still to test that.

hope this helps

Edited October 26, 2004 by Oilsmoke