It has been a long time since last update, again. The project has been standing still for about a month now, wether I can blame lack of motivation or lack of funds, I don’t know. Probably both.
I have a major issue with the bike, that I have to sort out before I can “ride” it for real.
This is for all of you Mikuni geeks out there! my knowledge is very limited when it comes to carburettors,
which also scared me a bit when I were thinking about purchasing the Mikuni RS34 carbs. Team d’Or told me that it was pre jetted to a Honda CB900F with the 985cc Wiseco big bore kit, but it would most probably require some fine tuning to my specific application.
The problem is, that the fuel mixture is too lean in the midrange, 1/4 -> 3/4 throttle. First off I thought I could adjust my way out of it, by moving the needle clip a couple of positions downwards, trying with one at a time of course.
Now the needle clip is in the lowest position, and I’ve still got a lean running engine. I had my bike dyno’ed some weeks ago, and the guy told me that I would have to get a 20 percent thinner needle, (huh? I thought they went in smaller steps?).
I have tried to figure out the Sudco online catalogue to find out which needle I would need for replacement, but it seems that I’m already running the thinnest needle made for my carbs.
So, perhaps I can resolve this problem by changing the needle jet, by getting a set of needle jets with larger inner diameters. Any thoughts?
My carb setup are as follows:
| Make/model | Mikuni RS34 |
| Main jet | #125 |
| Needle jet | 568 P-4 |
| Jet needle | 9DZH5-50 |
2 comments so far
Can’t help you with the carbs, but the bike is looking great!
August 2nd, 2006 at 6:29 pm
I have a 1990 GSX-R1100 with Mikuni RS-36 carbs. I’ve gone through 2 sets of plugs every year until I finally used my Sudco/Mikuni tuning Manual (www.sucdco.com) and started changing out the different jet sizes.
First you know what throttle position or % is lean, normal, or rich.
Then open up your carbs and use the exploded view in the manual to Identify which jets affect the problem area of the Carb.
Then start buying jets just above and below the size you have in your carbs. Keep a notebook and write down all jets names=size and start from there making notes. It took me about 3 days of making adujustments once I syncronized the carbs (yes it shows how to do that too ;). Hope this helps you. (I am self tought and this manual is all I used) Email me if you have further questions.
January 23rd, 2007 at 5:02 am
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