KZR's Bikes of the Month for 2024

85 GPz 750 Cafe Project

  • ajsfirehawk
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27 Sep 2016 20:21 #743767 by ajsfirehawk
85 GPz 750 Cafe Project was created by ajsfirehawk
Started with an 85 GPz 750 purchased from the original owner. Sat for nearly 15 years since he moved to CO from CA. Picked it up as a builder for a buddy who commissioned me to build his bike. Blew it apart, every nut and bolt. Shaved the frame, put a hoop on the rear, 77 KZ650 model B tank, 79 SR front fender that I shortened. Full carb rebuild, ultrasonic cleaned, Z1E kits, set the float levels. Shimmed the valves. Rebuilt the calipers and front master cylinder. Everything is back together except the headlight, front/rear running lights, turn signals, and wiring of the instruments. I tried to start her today on the baby bottle, no joy. Turns over nicely, spark at every plug tested with a color tune tool. My sense is something is amiss in the wiring. I've got 5 stock connectors that no longer go to anything. One is primarily for the headlight, one for instrument lighting, one for the instruments and I'm not clear on what the other two did on the stock bike. I'll dig into the wiring diagrams tomorrow. I'll also validate mechanical timing. I wire tied the cam chain to the cams before pulling them to shim the valves and visually the marks on the cams were correct before buttoning up the cam cover. Spark, air, fuel, and compression right?
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79 KZ650 SR
80 KZ1000 Z1 Classic
83 KZ1100 LTD
Z900RS
23 Mach 1

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27 Sep 2016 21:16 #743770 by baldy110
Replied by baldy110 on topic 85 GPz 750 Cafe Project
I like it, well done

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28 Sep 2016 00:00 - 28 Sep 2016 05:36 #743777 by Patton
Replied by Patton on topic 85 GPz 750 Cafe Project
Handsome bike. Awaiting street legal additions.

tried to start her today on the baby bottle, no joy. Turns over nicely, spark at every plug tested with a color tune tool. My sense is something is amiss in the wiring. ---

Is there sign of combustion in any cylinder?

Spark plug wires attached correctly?





Good Fortune! :)

1973 Z1
KZ900 LTD
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Last edit: 28 Sep 2016 05:36 by Patton.

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  • Tyrell Corp
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28 Sep 2016 03:07 #743779 by Tyrell Corp
Replied by Tyrell Corp on topic 85 GPz 750 Cafe Project
There are often a couple of accessories that are unused from new or disconnected, if your plugs are firing then then maybe coils swapped around as Patton has indicated.

If you have a spark and fuel I'd check your ignition timing with a strobe. Dynamic timing marks can be inaccurate if the crankcases and ignition pick ups are mismatched and different model years. I had this on a bitzer gpz550, subtle differences in crankcase castings between the years meant the pick up plate that I had marked from a donor bike was miles out, and needed to be slotted to time correctly.

1980 Gpz550 D1, 1981 GPz550 D1. 1982 GPz750R1. 1983 z1000R R2. all four aces

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28 Sep 2016 04:58 #743786 by GPzMOD750
Replied by GPzMOD750 on topic 85 GPz 750 Cafe Project
I like it. The fenders look really good.

The not firing has to be something stupid simple.

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  • ajsfirehawk
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28 Sep 2016 08:48 #743815 by ajsfirehawk
Replied by ajsfirehawk on topic 85 GPz 750 Cafe Project
No sign of combustion in any cylinder, not a single cough. The plugs wires are still factory plug wires with the numbers on them. 1,2,3,4 along with the factory coils, One of the few items not replaced with new parts. But it brings to mind the red and green wires to the #1 coil were pulled off. I've got the green wire on the bottom closest to the cam cover, red wire on the top. Opposite on the #2 coil, red wire on the bottom, black on the top. I don't see any + or - indications on the coils. Thank you for the kind words.

79 KZ650 SR
80 KZ1000 Z1 Classic
83 KZ1100 LTD
Z900RS
23 Mach 1

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28 Sep 2016 09:02 #743816 by GPzMOD750
Replied by GPzMOD750 on topic Re:85 GPz 750 Cafe Project
Tried starter fluid or squirting gas into the carbs?

The carbs were rejetted?

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  • Bozo
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28 Sep 2016 09:05 #743817 by Bozo
Replied by Bozo on topic Re:85 GPz 750 Cafe Project
Great looking bike, thanks for showing

First Permanent ride the Z1R since Dec1977 (220,000km) as of June 2015
Second permanent bike 1989 FJ1200 dyno'd 140RWH, great bike.
Third ride is now the Frankenstein 1981 GPZ1100B1, 1983 fully recon motor fitted LOVE THIS BIKE
Forth my work bike FJ1200 1989 (same type as FJ above)

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  • ajsfirehawk
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28 Sep 2016 09:13 - 28 Sep 2016 09:16 #743818 by ajsfirehawk
Replied by ajsfirehawk on topic Re:85 GPz 750 Cafe Project
Carbs were rejetted, I can look up the numbers, but went up one size from stock due to the addition of the pods on the pilots and the mains IIRC. I can look it up in my records. Pods aren't my thing but the owner wanted them in a big way. To shoot starter fluid in the carbs I'd have to pull the pods. That will really hose up the air flow won't it?
This is the 5th set of BS34 carbs I've rebuilt. All the others performed spectacularly. I'm FAR from an expert, but know my way around these carbs fairly well.

79 KZ650 SR
80 KZ1000 Z1 Classic
83 KZ1100 LTD
Z900RS
23 Mach 1
Last edit: 28 Sep 2016 09:16 by ajsfirehawk. Reason: added content

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28 Sep 2016 09:30 #743821 by GPzMOD750
Replied by GPzMOD750 on topic Re:85 GPz 750 Cafe Project
It's just a way of eliminating spark or timing issues. If it will fire with fluid you know you have a fuel or carburetion issue.

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  • ajsfirehawk
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28 Sep 2016 09:56 #743825 by ajsfirehawk
Replied by ajsfirehawk on topic Re:85 GPz 750 Cafe Project
I think I found my bug. The green wire runs from the ignitor to the #1 coil and then operates the left turn signals. The male green bullet connector without a corresponding female...goes to the stock GPz battery. I slipped in my KZ650 battery which does not have the separate GREEN wire female tap. I think I'm missing voltage to the ignitor straight from the battery.

79 KZ650 SR
80 KZ1000 Z1 Classic
83 KZ1100 LTD
Z900RS
23 Mach 1

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28 Sep 2016 10:58 #743828 by GPzMOD750
Replied by GPzMOD750 on topic Re:85 GPz 750 Cafe Project
Awesome!

I like that bike more every time I look at it. It's hard to believe it's a Ninja. I really like that it has fenders, side panels and doesn't have the ironing board seat

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