TOPIC:

gordone wrote: Can it be a clmbination here? You have checked the valve cap?

I understand you can get popping from incorrect valve clearness also.

Im not so interested in the popping because I know where that comes from. We took the baffle out of the 4 into 1.

Rich now Im primarily interested in dealing with why the plugs are sooty, thinking it could be valve seals, ignition coil or the carbs.

My son wants to gift me with a set of Keihin CR carbs. I just might take him up on that.

Bad spark plug caps can do that as well. If your plug wires are removable the ends to the coils could be corroded. Take the plug caps off and nip 1/4" from the ends and the coil side too.
Steve

SWest wrote: Bad spark plug caps can do that as well. If your plug wires are removable the ends to the coils could be corroded. Take the plug caps off and nip 1/4" from the ends and the coil side too.
Steve

What do you think about my son's idea of getting New CR Keihin 29 carbs?

Too big for a non modified 650.
Steve

SWest wrote: Too big for a non modified 650.
Steve

Remember, no more baffle on the bike, so a lot more air now. 29's may be OK

from this forum:

www.kzrider.com/forum/3-carburetor/51576...-cr29-for-street-use

"math would tell u that 29mm carbs r too big for a 650cc motor, but guys do it and come away with a smile.
there r guys hear running rs34'd on kz810's and report good results. i run them on my 1200cc kz.
1 thing about buying used aftermarket carbs, is that u will never loose money if u sell them later. its hard to find them though.

generaly speeking, carbs r like cams. if u increase the size of the carb/cam , u gain top end and loose bottom end.
so keep that in mind. if u like ripping back roads and drag raceing, bigger is better. if u like doing wheelies smaller is better."

from another

This gentleman put them on his bike. Says it runs like a dream. He wrote

"I did not ever get the VM24s to run right, even after multiple rebuilds and tunes. I can say that the CR29s are amazingly smooth but if you open them up it’ll scream! I notice that the throttle response is crisp and that it just wants to be ridden fast haha."

www.dotheton.com/forum/index.php?topic=72678.0

He's lying, no way is he getting 29's to run right on a stock motor. The VM24 is a good carb and once dialed in runs great. Put the baffle back into the exhaust, set the floats using the wet method, install 17.5 pilots, 102.5 mains. Make sure all the maintenance has been done. Make sure there is 12 volts at the coils. The bike will run good.

No eBay APP ID and/or Cert ID defined in Kunena configurationThanks.

The baffle wasnt part of the problem. It was only taken out today. Me and my sons like to make noise (they have KZ's as well) so the baffles stay out. I will have a second think about the CRs. Such a mixed reaction on them. When I did a search here in the forum, lots of posts from 2012 that say the run great.

IN re the bike: The previous owner put a Dyna S in it, but the coils looks stock. Should I get these:

Its likely kawasaki knew a little more about capacities and carb sizes than some internet forum guy. Z900's and z1000 had 26's on them. When khi bought out the z1 to create the best and fastest road bike available at the time if they could have got better performance from bigger carbs do you not think they would have used them given their aim to blow away the market. Hell, they even held back two years and increased the capacity from 750 to 900 because Ho da beat them to market with the cb 750.
Listen to what the guys are saying, get the 24's set up correctly for your bike and you wont be disapointed.

No eBay APP ID and/or Cert ID defined in Kunena configuration

Warren3200gt wrote: Its likely kawasaki knew a little more about capacities and carb sizes than some internet forum guy. Z900's and z1000 had 26's on them. When khi bought out the z1 to create the best and fastest road bike available at the time if they could have got better performance from bigger carbs do you not think they would have used them given their aim to blow away the market. Hell, they even held back two years and increased the capacity from 750 to 900 because Ho da beat them to market with the cb 750.
Listen to what the guys are saying, get the 24's set up correctly for your bike and you wont be disapointed.

Yes I think I will forgo the CR's. My sons and all their youthful energy is infectious.

One of them said "if you dont get CR's you must get pods." These boys dont quit. Final decision, im going to find out what is going on in the carbs to make cylinders 1-3 foul plugs (but not 4 strangely enough) and get this thing running right.

As I mentioned the previous owner put a Dyna S in but didnt change the coils. Should I get these?

Couldn't hurt. That's what I have.
Steve

These documents may be helpful in understanding how a carb works and how to rebuild them. Note that in the disassembly document he calls the diffuser a needle jet. I believe the needle jet actually sits up in the main jet chamber, and is partly visible when looking through the air chamber.

Kz650 owner of 2 here, and one kz1000.I rebuild carbs all the time. I do have an ultrasonic cleaner. Which does an extreme job cleaning, you won't get the vapor blast look, but you will be assured every nook and cranny of all ports and orifice are cleanec.