RS34 jetting

[jimb12]

Ignore the Dynojet stuff, absolutely irrelevant to RS carbs. I had some of those RS34 years ago, try 122.5 mains and see what you get to start off with. As far as the pilot screws, they should be 1/4 to 1/2 turn out, NOT 3 turns. Again, NOT the same as a CV carb.

Important, if you only have a single-cable throttle, get a push-pull throttle for it. The RS slides get a strong vacuum signal and can sometimes hang open, which means you let off the throttle on the handlebar but the engine doesn't slow down.

[DFWSpeedster]

That sounds better. These came off of a GS1000 and the mains are 110's. I thought it was weird that Mikuni's RS tuning guide gave the entire range from GS1000-GS1150 and recommended 130 for all of them.

[trippivot]

I love the sound at idle -- clickety clack..

from the MIKUNI PAPER it shows the pilot mixture screw range of operation is 1/4=0.25 turn (lean) out to 3-1/2=3.5 turns (rich) from gently seated closed. - more than 3 turns get a bigger pilot jet - less than a quarter turn get a smaller pilot jet. I prefer to be close to 1 turn - and balance it with the needle setting - that allows you to control the fuel better (overall) and at a later date if the weather changes you can have a more effective adjustment with only the mixture screws - (nevermind the advanced tuning)

the 17.5 pilots may be too rich for your engine - you will have to experiment using a lean idle drop procedure-- not every mixture screw has to be exactly equal (example 1.5 across the board) - you have to find the best mixture setting for each individual cylinder - if you almost have to seat the mixture screw closed -- or cannot get a distinct idle drop - get some 15 pilot jets.
- just get it to idle within the mixture screw range first -

needle height adjustment and re- sync go hand in hand - if you change the needle you have to re-sync every time- that is true on ALL mechanical slide carbs. -- #3 is the base you dial the others to. getting good with the ramped adjuster mechanism takes practice.


float height works best at 17mm -- not 19 like the picture shows - there may have been some changes to the newer model body castings or it is a typo because the book that came with my set shows 17 and it works on all the sets I have - 34/36/38/40 - yes I have too many carbs. no I'm not selling.


110 may be great for your engine on the street. you are going to have to test and re-tune.

spark plugs are cheap and all carb parts are easy to get. ever have trouble contact me.

[DFWSpeedster]

Thanks for this. So even though these came off of a GS1000 I should start with the 110's on it? I haven't looked at the pilots yet, so I assume if they work for a gs1000 they probably wont be too rich for me?

[DFWSpeedster]

Can anybody point me to a synchronization guide for these carbs?