1985 Kawasaki GPz750 needs refresh

[Buffalo Bill]

That site https://www.motorcyclespecs.co.za is an excellent info source, but has a few small quirks,

[Buffalo Bill]

Mouse tomb…
Found the remains of 2 here, plus another one carbonized under the battery.
Used the garden hose to wash away the Harkonnen stench.

nOrqzEY.jpg

[Buffalo Bill]

The damage to repair, will need some color coded wire.

q8Kp5KJ.jpg

[Nessism]

On KZ Rider, you can download the factory service manual. Like Suzuki, Kawasaki published a full first year manual, then a supplement for each year after, showing changes. You may need to join the site in order to download. It's a nice site. Huge knowledge on the early big KZ's there. Less on the 750's, but enough to be helpful.

[Buffalo Bill]

On KZ Rider, you can download the factory service manual. Like Suzuki, Kawasaki published a full first year manual, then a supplement for each year after, showing changes. You may need to join the site in order to download. It's a nice site. Huge knowledge on the early big KZ's there. Less on the 750's, but enough to be helpful.

Hey I have done some surfing for info on KZ Rider, but they haven't accepted my application yet.
This GPz I bought has pod filters, with 185 main jets and an unfinished job leaving the EPA system half connected.
On KZ Rider I found a post about pods with one responder including a 1983 Cycle World test comparing pods to stock airbox on a dyno and at a drag strip.
Bike used was a Suzuki GS 1100E.
Conclusion was, pods on the dyno had slightly more peak HP, but gave up power in low and midrange. Pods had a half sec. slower ET time than base stock bike.

My own conclusion is: buy an airbox on ebay pronto.

[Nessism]

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.

[Buffalo Bill]

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.

[Nessism]

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.

The '82 frame is quite different from yours. Hope the airbox fits. Early bikes were dual shock, GPz, single shock.

[Buffalo Bill]

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.

[Nessism]

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.

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.

[Buffalo Bill]

Thanks for your helpful advice, I glad you're interested.

[Nessism]

I love those bikes! Obviously! I own one! Not a GPz, but a KZ. One of the best UJM's ever, in my opinion.

[Buffalo Bill]

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.

[Nessism]

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.

DUDE, Bill, Haynes manual sucks.

Here is the factory manual...https://www.kzrider.com/filebase-ali...anual&catid=17

[Buffalo Bill]

I'm on KZ Rider now, Thanks!