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140 main jets!?
- stevets
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The tank was clean so I pulled the plugs and loaded all cylinders with wd40 a couple times over several weeks, and found good spark +compression. With a squirt of starting fluid and some battery, she barked to life immediately.
Since then I've replaced the oil, gave the carbs a modest clean up,and new plugs. The original aftermarket air cleaner had disintegrated and I could not find a replacement element so I went with pods. Before the pods I could get the bike to run. Now...no luck. I assumed I needed to jet up and so took off the carbs and found mains marked 140 with 17.5 pilot jets on what I think are 2nd generation 128mm carbs. The bike has a Racer One 4 into one pipe.
Thats the bad news. The good is I think this is actually a Z1 based on the frame number - Z1F-502288 and manufacture date of 10/75.
Based on all I've read here the 140 mains seem huge! So I have a couple questions:
Should I assume some internal mods to warrant the huge mains?
What is the trick to removing an oilfilter cover thats been untouched for 25 years?
It's a really nice looking bike and I had such a boner for one these when i was a youngster that i can't wait to ride this monster. These have such a distinctive engine note it's a rush just to hear that music again. I'll share some pics when it's closer to being re-assembled.
Thanks for the help you've already provided and I appreciate any comments on this thread
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- SWest
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Good Job.
Steve
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Steve
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- bountyhunter
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Hope you saved the stock airbox. You can get replacement filter elements by size. You buy the metal frame with the foam cell filter element around it and oil it. I have been running one for 30 years.stevets wrote: Hello All, I found a garage find ( parked since 1988) 1976 kz 900 last fall. The bike was clean and modded with a 4 into one, electronic ignition, a 42 tooth rear sprocket and some nice chrome work. I have no other info on any internal mods.
The tank was clean so I pulled the plugs and loaded all cylinders with wd40 a couple times over several weeks, and found good spark +compression. With a squirt of starting fluid and some battery, she barked to life immediately.
Since then I've replaced the oil, gave the carbs a modest clean up,and new plugs. The original aftermarket air cleaner had disintegrated and I could not find a replacement element so I went with pods. Before the pods I could get the bike to run. Now...no luck.
1979 KZ-750 Twin
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- SWest
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Steve
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- SWest
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Steve
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Steve
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Now it's "just" a matter of figuring out why she starts bogging at about 5000 revs.
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