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carb rebuild and 1075 kit
- DoubleDub
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- DoubleDub
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- saxjonz
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- KawboyZ
79 LTD B3
80 LTD B4 1075 kit JE Pistons .410 cam grind, Bassani, 31 keihin CR Specials...
1980 Z1R, 2002 ZRX1200, 2003 ZRX1200
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- DoubleDub
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If it is a venting issue, what can I do? I replaced the vent seal when I was working on it this last year because it was cracked and didn't seem to seal completely. Can the vent be cleaned/repaired if it isn't venting properly?
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- mtkawboy
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78-KZ1000/1105, 80 KZ1000, 82 Kawasaki GPZ750, 95 Harley Fatboy, 80 Suzuki GS1100ET, 81 GS1100E parts bike, 83 GS1100SD Katana/1394,78 Yamaha XT500, 81 Yamaha XS650, 78 Yamaha XS650E, 48 Whizzer model J motorbike, 71 Honda CT70H, 71 Honda CT70, 81 IT 250 Yamaha,82 Honda XL100S owned
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- DoubleDub
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- gane
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[img][/img] 1977 KZ1000A1
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- larrycavan
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If it were me, I'd put a 110 or 112.5 main jet in it.
The pull the enrichener lever on trick....is a great way to figure out which way you need to go.
If that makes it worse, remove the rear silencer portion of the airbox and the filter. Go for a ride. See if that helps.
If you find a foam or K&N filter that would clamp to the back of the airbox where the silencer portion attaches, then go that route and loose silencer section & the stock paper filter.
JMO
Larry C
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- DoubleDub
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Thanks for the input guys. I don't think I'm dealing with a jetting related issue at this point. I was very much expecting to be on the very rich end of things at WOT with a 120 main. At this point I'm not seeing any signs of too rich on the plugs, pulling the enriching circuit (choke) on at WOT doesn't seem to affect the running at all (better OR worse) and opening the gas cap has had the most effect - that is most of the hesitating/popping went away. I think I'm dealing more with a fuel starvation than a jetting problem at this point. I just need to figure out what is causing it.
I'm starting with the gas cap vent and working my way down. The petcock appears to have caught most of the loose rust that had been sucked down into where it inserts into the fuel tank - very little made it into the sediment cup and even less into the fuel filters. Float bowls looked clean of debris. I'm going to check my fuel lines again and see if there are any hard kinks in them (thanks Gane!) and go from there.
Larry - I am missing the silencer and am running the K&N replacement filter in the airbox. I'm surprised that you recommend reducing the main jet size from the factory's 115 main with the displacement increase (903cc -> 1075cc) that was made - seems counter-intuitive to me.
If I can't find the starvation issue with the items I mentioned I will pull the carbs apart and make sure that the fuel passages are clear - it's possible that they have varnish/gunk in them as the bike sat for quite a while before I rebuilt it.
Thanks again all!
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- larrycavan
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Again, I apologize to the OP for hijacking the thread.
Thanks for the input guys. I don't think I'm dealing with a jetting related issue at this point. I was very much expecting to be on the very rich end of things at WOT with a 120 main. At this point I'm not seeing any signs of too rich on the plugs, pulling the enriching circuit (choke) on at WOT doesn't seem to affect the running at all (better OR worse) and opening the gas cap has had the most effect - that is most of the hesitating/popping went away. I think I'm dealing more with a fuel starvation than a jetting problem at this point. I just need to figure out what is causing it.
I'm starting with the gas cap vent and working my way down. The petcock appears to have caught most of the loose rust that had been sucked down into where it inserts into the fuel tank - very little made it into the sediment cup and even less into the fuel filters. Float bowls looked clean of debris. I'm going to check my fuel lines again and see if there are any hard kinks in them (thanks Gane!) and go from there.
Larry - I am missing the silencer and am running the K&N replacement filter in the airbox. I'm surprised that you recommend reducing the main jet size from the factory's 115 main with the displacement increase (903cc -> 1075cc) that was made - seems counter-intuitive to me.
If I can't find the starvation issue with the items I mentioned I will pull the carbs apart and make sure that the fuel passages are clear - it's possible that they have varnish/gunk in them as the bike sat for quite a while before I rebuilt it.
Thanks again all!
Make sure you check the design fuel level in the carbs. If it's off, you'll play hell trying to jet the bike properly.
I don't recall any 1015cc with 26mm carb and 115 Main Jets from the factory??? :huh: [maybe 76 900 LTD was that rich]I'd have to dig for my old Kawasaki spec manual to see.
US Spec 1000's generally had much smaller main jets. From 107.5 down to 102.5
The factory continually leand out the Z motors over the lifetime of it's use with 28 & 26mm VM type carbs.
Your setup with the replacement filter and airbox silencer removed is a good setup.
If you do have a fuel stavation problem, after correcting that, your bike may well like a smaller main jet. Only 1 way to tell....
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- DoubleDub
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- DoubleDub
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