couple ?'s on VM34's

[antblyme]

Been battling to get these things tuned

Needle Jet=159P6
Needle=6D97
PJ=20 (tried swapped out 22.5)
MJ=180
Air jet removed

I've read that as a baseline, to set the slide heights with a 5/32" drill bit. In order for me to do that, I need to turn my throttle adjust screw out 6 turns to lower the slide. I didn't buy these carbs new, so that last guy could have screwed with them. Is it possible I have the wrong mixture screw?

Also - as a baseline, how many turns should I have the air-adjust screw at?

thanks

 

[tonyc]

Here is what I am running now. Stock engine. needle 6f9 clip 3 position nj=p-6, pj=25, mj=180, ca=2.5, aj=none, fl=25 from M.M.M 650 Central seems to work now. Tony C

screw in the top cable adjusters to start with.before you start using the drill bit method. Tony C

 

[antblyme]

thanks - not trying to turn this into a VM tuning thread..................I'm just stumped on this idle screw / slide thing. the top adjusters are all the way down. I still need to turn the screws out 6 turns to get the the slides to drop to the appropraite level. something just doesnt seem right.

 

[tonyc]

Check the slides without the cables installed to see if the slides will fall. Tony C

 

[JasperLP]

It is possible to get the wrong slide in the wrong carb. Make sure the cut away on the slide is to the rear.

 

[5twins]

Your needle is wrong and you don't count the turns in/out on the idle speed adjusting screw, that's a mix or air screw thing. Turns in/out on the idle speed screw don't really mean or tell you anything. You just set it where it needs to be for the proper idle speed.

 

[grizld1]

Right. Antblyme, there is no 6D97 needle. What you probably have is the 6DP1. The 6F9 will give you much better results.