KZ700 Bogs down when releasing clutch. Ideas??

Hi guys! I'm totally new here! I Just purchased a running kz700 for super cheap the other day! I really like the looks of it and intend on doing some upgrades here and there. It doesn't ride half bad either.

But heres my issue. I brought it home, flushed the tank and got it to run half decent. I put 10 miles on it last night. But today I went out and attempted to take it for a spin. It idled fine, revved fine, but as soon as i let the clutch out it started to bog. I noticed the kick stand switch, and figured that might be it. But then i really revved it and let the clutch out and it was able to move, but kept bogging whenever I let the clutch out, literally almost dying on me. So I ruled out the kick stand switch.

The carbs were recently rebuilt and synced, but I believe it could still need some tuning done to it.

I'm not asking for a quick fix, but rather a place to start. Plugs seem to be on correctly, its getting fuel, and the clutch seems to be functioning properly. Any ideas? Thanks dudes!

Hello, John, and WELCOME to KZr!

Would first assure that the advancer is properly functioning.

Good Fortune!

Hi! Thanks for the quick response.

Aren't all KZ700 CDI and fully electronic?

Are you in first gear? Are the brakes dragging?

What Ret said, check the brakes from dragging, like stuck pistons in your brake calipers, Not uncommon with bike has been sitting for awhile.

johngeiser wrote: . . . Aren't all KZ700 CDI and fully electronic?

Am thinking you are correct in that the KZ700 doesn't have a mechanical timing advancer with springs and weights.

The following thread may help somewhat, but doesn't get into how to check timing, with, for example, a timing light.
www.kzrider.com/forum/4-electrical/53036...-a-1984-kz700#530360

Is a Factory Service Manual available?

Good Fortune!

For a free downloadable KZ750 4-cyl service manual, use this link, and scroll down to "The Bible" ---
mbsween.bike-night.com/kz750l3/index.html

The manual includes 1984 KZ700-A1.
The following timing info is from page 409.



Perhaps the manual provides more detail about checking timing with a strobe light in another section dealing with a KZ750 model.

Good Fortune!

Check out page 373 --



If the timing checks out okay, would suspect imperfect carb pilot circuits.

Will the engine freely rev up with the transmission in neutral?

Is it possible to get up to road speed in the mid-throttle range, say 60-70 mph, to evaluate performance beyond the pilot circuit?
In other words, is performance otherwise acceptable except for low rpm lack of power and bogging at pull-away from idle?

Good Fortune!

doesn't any bike die out when you release the clutch?

Make sure the choke is off.

Only time this has happened and required lots of throttle to take off. Happened when I initially got the bike on the road and had the original chain installed. After about a hundred miles the chain stretched considerably. This caused my bogging and extra throttle requirement. Changed to a new properly adjusted chain and everything was fine. I know it sounds far fetched that this could be a factor. But in my case it was. Takes 2 minutes to check your chain slack.

We need more information about the problem. Realize of course that it's perfectly normal for the bike to not run properly when it's cold. That's why the bike has a choke feature. Typically it takes several miles of running for the bike to come up to temp and accept throttle properly without the choke open.

Also realize that the bike needs to be in a proper state of up to date maintenance before you can diagnose running issues. Things like properly adjusted valves, the airbox and air filter installed, or the carbs properly tuned for any mods, etc.