TOPIC:

Get to the point it pops and rattles, shut it down with the throttle in that position. Check the plugs. That will tell you a lot. Pic? Black smoke?
Steve

They are black and oily. My original thought was that the main jet was the issue, but I have not even gotten to a point where the main jet would be a factor.

Stock settings were
Main Jet : 260
Pilot Jet : 35
Needle Jet : Q-2
Throttle Valve : 2.5
Jet Needle : 6DH4
Air Jet : 2.0
Needle Valve : 3.3(VM34/39)

I dropped the pilot to a 30, have main jets 130 to 160 and have the needle on the top clip.

After reading up at bit on the kz400 forum, I'm getting a new needle and needle jet.

There are, of course, all of the other factors you would check before jetting. Sorry if this is repeating, but this thread goes back some time:

Compression
Valves
Valve timing if the motor was apart
Voltage to the coils
Ignition timing
fuel flow
fuel level


Have you checked other sites for more specific jetting suggestions for this combination?

I'm getting stuck on the oily part. While I was burning oil because of valve guide seals I had to step down on my pilots and main jets to compensate. When I fixed it, I was too lean. Might be going in the wrong direction.
Steve

Oily was probably a really bad way to describe it, they are just really black.

On a side note, what would you guys say a good price for an 81 kz440 running good condition with title would be? I might have a deal on hand I can't pass up.

I din't know but you can try the 400 sites. Pics and asking price?
Steve

dom2570 wrote: Oily was probably a really bad way to describe it, they are just really black.

Is that carb normally for a two stroke?
Steve

swest wrote:

dom2570 wrote: Oily was probably a really bad way to describe it, they are just really black.

Is that carb normally for a two stroke?
Steve

Honestly, I have no idea. I've kind of been blindly following threads were people claim to have gotten it all worked out. I'm kinda bashing my head against the wall at this point. Luckily I am going to switch gears and focus on my new toy.

The new bike is an 81 kz440 but complete. I haven't got a chance to do anything with it, but it looks good.

Just a few more pictures from today.

Carb is set up with

Main 160
Pilot 30
Needle jet Q-0
Needle JN6F9

I have been beating my head against the wall with this thing lol. I have not checked for any air leaks that is next on the list as I run out of ideas. The new bike looks like it will be much less work so hopefully I will get a little bit of a brain break while I get her going.

Now there you go. Flogging a dead horse with the other one.
Steve