1980 750H bare bones for mattylight

Can you wire in a voltmeter directly to the positive of the coils and to the ground of the igniter? That might show something. It should be around 14v while you are revving past 2000 rpm.

Are you using a motorcycle battery or car battery?

They were bolted to the frame. When I isolated them they worked fine.

I am using 2 tractor batterys. It did read 14 volts at first and now reads about 12.50 volts.

Also, are you opening the carbs quickly or slowly? Opening them quickly gets rich, opening slowly keeps it leaner. If one works better than the other, that can tell you if you are richer or leaner than you should be.

Slow or fast did not seem to matter. Do you think I need bigger jets? As soon as I back down to 4000 it runs good.

I really hate to take up so much of your time, you have been very patient with me. I would just like to see this through, hate to give up on anything.

Looking back at the photos, it appears you have a large manifold for the air cleaners. I'm not sure what, if anything, that will do to the carburetion. Have you changed the carbs jetting at all?

Also what carbs are they?

I see you have a car battery, so voltage should not really be a problem, but always still need to check. Still need to verify the coils have at least 12v on them at all times. You are using a Dyna S, so the motor must have a good ground to the battery negative, for the dyna s to work.

You really don't want to get into carb work until you know for sure the ignition and timing are rock solid. Have youput a timing light on the motor to check the advance?

You probably should make up some really good voltmeter test leads with good alligator clips on them.

Timming is a good question. I have timmed car engines off the fan timming. How and where would you check a kz engine?
The carbs are 26 mm. I put in the smaller jets from Z1, not really sure what size, they come with 2 sizes in the kit. One good thing about the Dyna coils, the plugs are not fouling anymore. I did not see any timming marks on the Dyna S mounting plate.

snerff wrote:

Timming is a good question. I have timmed car engines off the fan timming. How and where would you check a kz engine?
The carbs are 26 mm. I put in the smaller jets from Z1, not really sure what size, they come with 2 sizes in the kit. One good thing about the Dyna coils, the plugs are not fouling anymore. I did not see any timming marks on the Dyna S mounting plate.

I'm not real familiar with the timing marks on a 1000. You may want to post a thread in the electrical forum about timing. There should be marks on the advancer and a pointer in the engine casting.

There won't be marks on the Dyna, I don't think.

With the massive manifold on the air filters, you could be lean, but it's just really hard to say with all the bends etc. It may be some trial and error time for the jets.

snerff wrote:

Timming is a good question. I have timmed car engines off the fan timming. How and where would you check a kz engine?
The carbs are 26 mm. I put in the smaller jets from Z1, not really sure what size, they come with 2 sizes in the kit. One good thing about the Dyna coils, the plugs are not fouling anymore. I did not see any timming marks on the Dyna S mounting plate.

I'm not real familiar with the timing marks on a 1000. You may want to post a thread in the electrical forum about timing. There should be marks on the advancer and a pointer in the engine casting.

There won't be marks on the Dyna, I don't think.

With the massive manifold on the air filters, you could be lean, but it's just really hard to say with all the bends etc. It may be some trial and error time for the jets.

Well, I took the carbs apart and cleaned them again and blew air in all the passages. I also installed larger jets,17.5 I think. It now runs great. Not sure if it was the cleaning or the jets.
For a starter I used a 12 volt dc motor with chain directly to the drive axle. I thought that would work and the motor would be ok when not used. That did not work, the motor overheated while being run without load from the drive axle. Just thought I would try. Guess I need a started and small flywheel.
Anyway it does run great and thanks for all your help. On the the next one this winter.

Glad to hear you found the problem on the carbs. Sorry to hear about the starter.

Are you going to try a stock starter?


EDIT 1/9/2019:
Mattylight Barebones Bare Bones Wiring Diagram
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