GPZ900 wonít start! - Kawasaki Motorcycle Forums
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post #1 of 6 (permalink) Old 12-22-2017, 01:40 PM Thread Starter
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GPZ900 wonít start!

Okay I have a 1985 GPZ900 that will continue cranking but will not run. The background is I recently replaced the engine with a warrantied gone through engine (so it shouldnít have any problems). I went through and cleaned the carbs twice now, I also have clear fuel lines and can visually see fuel running through them from the tank. I also have pulled the plugs which are brand new checked the gaps and verified a spark. Currently no air box is connected but my exhaust is fully connected. The engine will run for about 2 seconds with starter fluid which is leading me to believe itís a fuel problem? Any suggestions would be fantastic. Also when I first got the engine to run I had a pretty decent back fire but this has not happened since. Thanks for the help!
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post #2 of 6 (permalink) Old 12-22-2017, 05:23 PM
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Install the air box. These engines don't like to run without them

Did you install a fuel filter? If not, the carbs could plug up quickly from rusty debris in the gas tank.

What is the compression?

1985 Kawasaki ZN700 Shaft, 4cyl
1989 Yamaha Venture Royale
2007 Yamaha Royal Star Venture
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post #3 of 6 (permalink) Old 12-22-2017, 06:51 PM
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Do you know if the choke is working? My GPZ900 will not even fire when cold unless the choke is fully on. You can verify it is on by manually pushing the choke linkage on the front of the carbs to the left and check that all of the choke plungers are pulled out.


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post #4 of 6 (permalink) Old 12-22-2017, 09:30 PM Thread Starter
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Thanks for the input! Iíll throw the air box back on, I've just avoided it because of the work to put it on but Itís inevitable regardless. Iíll check out the compression. I honestly didnít check it myself, but it was checked multiple times before purchase. Also the choke is working, on the previous engine the carbs functioned perfectly so Iím guessing itís due to the air box. I do have a fuel filter on as well, and it does appear to be clean. Iíll keep you guys posted. This was a surprisingly easy job to do so something had to cause troubles!
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post #5 of 6 (permalink) Old 01-08-2018, 09:01 PM Thread Starter
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Okay I installed the intake and have been playing with the fuel/air screws and still cannot get this to start. Thinking it has to be carbs any thoughts?
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post #6 of 6 (permalink) Old 01-10-2018, 01:25 PM Thread Starter
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Fixed it. Due to airfuel screws being set incorrectly.
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