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1985 Kawasaki GPz750 needs refresh

Could your carbs have a Dynojet kit installed? I say that because Dynojet has a different numbering scheme than Mikuni, and the numbers are higher. If those are 185 Mikuni mains, I'm surprised the bike would even run.

At KZ Rider, your first post must be an introduction, or the mods get mad. And I agree with getting an airbox. Hope you can find one.
 
It does look like the PO installed a dynojet kit, but not sure. The needles are slotted for adjustment.
I bought a 1982 KZ750 airbox. I'll bet the frames are the same, the box may fit or be close enough to modify to fit. The shape looks the same with different attachment points for hose and frame.
The authentic GPz airbox's were all way overpriced and in Europe.
 
Last edited:
Buffalo Bill said:
It does look like the PO installed a dynojet kit, but not sure. The needles are slotted for adjustment.
I bought a 1982 KZ750 airbox. I'll bet the frames are the same, the box may fit or be close enough to modify to fit. The shape looks the same with different attachment points for hose and frame.
The authentic GPz airbox's were all way overpriced and in Europe.
Click to expand...

The '82 frame is quite different from yours. Hope the airbox fits. Early bikes were dual shock, GPz, single shock.
 
Super bummer, the starter clutch is not working so good, only catches sometimes.

I rebuilt the carbs with stock needles and main jets.
Got the bike started and carbs synced.
Generating electricity, 13.7v at idle.

Replacing a GS starter clutch is ez compared to a Kawasaki. Suzuki GS starter clutch is on the back of the flywheel, I replaced it on my GS1100G this summer.
Kawasaki has the starter clutch inside the transmission, on the secondary shaft with the clutch basket & oil pump.
Engine has to come out and be flipped upside down.
That shaft has to come out.
 
Last edited:
Buffalo Bill said:
Super bummer, the starter clutch is not working so good, only catches sometimes.

I rebuilt the carbs with stock needles and main jets.
Got the bike started and carbs synced.
Generating electricity, 13.7v at idle.

Replacing a GS starter clutch is ez compared to a Kawasaki. Suzuki GS starter clutch is on the back of the flywheel, I replaced it on my GS1100G this summer.
Kawasaki has the starter clutch inside the transmission, on the secondary shaft with the clutch basket & oil pump.
Engine has to come out and be flipped upside down.
That shaft has to come out.
Click to expand...

Replacing the starter clutch is more work on that bike, but you can do it with the engine in place. Tons of threads on this at KZ Rider. Buy a new starter clutch gear, rollers, springs. And NO bic pen springs, thank you.
 
I love those bikes! Obviously! I own one! Not a GPz, but a KZ. One of the best UJM's ever, in my opinion.
 
I'm still waiting for a Haynes manual. Book store sent it media mail, a euphemism for shipped via ox cart.
I am finding very good utube videos for specific procedures.
 
Got the starter clutch out, utube videos were a big help.
The case is cracked, seems to be a common failure.
Waiting for gaskets now.

CQZnuos.jpg
 
Finally getting some rides in after waiting weeks for different parts.
More to do, I bought clip-on handlebars from an 83 GPz because they're lower and more forward, I have long arms.
Need new tires but I'll wait until next season, plus some carb adjustments, power drops off at 8,000 RPM.

7TPVyng.jpg - Click image for larger version Name: 7TPVyng.jpg Views: 0 Size: 80.1 KB ID: 1779319
 
Had a hard time with the rear brake system. Eventually replaced everything except the pedal.
The Kawasaki rear master cylinder seems to be very much the same for many of their bikes, with slight differences.
I did rear brake jobs on 3 of my bikes. They do get taken for granted.
 
Rob, you're telling your and your bikes age, with some of these newer bikes 8K rpm is just half throttle.
 
LMAO. Z1 redline is maybe 8K on a good day, and Rob also had a Harley, where redline is just over 6K. I think dementia is setting in.
 
Buffalo Bill said:
Finally getting some rides in after waiting weeks for different parts.
More to do, I bought clip-on handlebars from an 83 GPz because they're lower and more forward, I have long arms.
Need new tires but I'll wait until next season, plus some carb adjustments, power drops off at 8,000 RPM.

Click to expand...

Such truly lovely bikes. I forget at times how pretty they are.
 
GS1150Pilot said:
LMAO. Z1 redline is maybe 8K on a good day, and Rob also had a Harley, where redline is just over 6K. I think dementia is setting in.
Click to expand...

Z1 redline was 9k, and it made good power past that any day of the week.

The Sporty red line may have been 6k, but there was virtually never any benefit after 5k.

Wait, what were we talking about?
 
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