cafed650 time to jet spot on!

Ok so I am tired of the bike running off and its time to get it jetted spot on...

The exhaust is fairly open with minimal baffling and I have a K&N in the airbox...yes the airbox is still there! haha...might consider pods if I get sick of putting the carbs on and off!!!

So...jet opinions...

when I get the carbs off I will tell you whats in there right now.

-Brian

scumbag wrote:

Ok so I am tired of the bike running off and its time to get it jetted spot on...

The exhaust is fairly open with minimal baffling and I have a K&N in the airbox...yes the airbox is still there! haha...might consider pods if I get sick of putting the carbs on and off!!!

So...jet opinions...

when I get the carbs off I will tell you whats in there right now.

-Brian

I'm no expert, but I know reducing the back pressure with "open baffling" will make it run severely lean. They usually say go at least +1 richer main and pilot jet for a start. On mine, I also had to go +2 slots richer on my needles to get decent throttle response (YMMV).

Adding pods will probably screw things up completely.

The best info I have ever seen giving a basic procedure to dial in jets and CV carbs is here:

www.factorypro.com/tech/carbtun.html

Post edited by: bountyhunter, at: 2008/02/14 12:59

What made you think this guy had CV carbs? The info for CV carbs doesn't translate well to VM series carbs.

After the words about dialing in the bike's jetting, first thing I figure out is that there is NO info on current jetting and no info on how the bike performs with this jetting. I have to make an assumption we are talking about non-pump VM24s with pilot fuel mix screws?

When you look down through the muffer and see "minimal baffling" this is normal with ANY 4 into 1... mostly looks wide open. MOST, if not ALL 4 into 1 systems made for a KZ are perhaps described best as cosmetic noisemakers that don't really flow much better than a stock system. If you are using a K&N filter in the stock airbox, try the stock jetting I guess and see how it works.

Brian, i still have the two other sets of carbs here too, i will take a look see at the jets in them. I think they are stockers though.
I will get back to you on them.

The carbs are Mikuni vm24ss

Well the main jets are 102.5's and the pilots (the jet right next to the main)have a 50 on them. Have not looked at were the clip is on the needle but will look this eve.

thoughts wired?

Not sure if this helps you much or not but with my 77 650, running the stock vm24 (non-pumpers) with the baffle cut off and the back plate put back in and emgo pods I'm running 17.5 pilots, needle one clip down and 117.5 mains and have perfect plug chops (and she's a one kick start and runs like her a$$ is on fire).
Probably doesn't mean much to you right now since you've got a K&N drop in, but if you do opt with pods at least you'll know a good baseline.

cool...thanks Anarki

Is there another pilot jet underneath the '50'?

I can't find it now but WG wrote about these carbs and I believe he mentioned that certain carbs had a #50 restrictor on top of the pilot jet, so yes there should be something underneith it. He says you can leave (save it) the restrictor off.

Bluemeanie wrote:

I can't find it now but WG wrote about these carbs and I believe he mentioned that certain carbs had a #50 restrictor on top of the pilot jet, so yes there should be something underneith it. He says you can leave (save it) the restrictor off.

Crazy...would love to hear more

The barrel jet with the #50 is OVER the pilot jet. It doesn't really have a whole lot of effect on the operation of the pilot jet which has a MUCh smaller hole and is really what controls fuel to the pilot circuit. With your set up, I would use #102.5 main jets and a #15 pilot jet (which is under the #50 jet). The #15 pilot jets are the stock size. I am not sure which jet needle you are using but it likely wouldn't hurt to clip to the 4th slot. The K&N drop in filter and 4 into 1 likely don't flow much more air than a stock filter and pipes. MOST 4 into 1 pipes actually don't flow much better, if at all, than the stock system.

Are the slots on the needle numbered from

the needle tip (needle point, lol) to butted end,
or the butted end to needle (point)?