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KZ1000 jetting advice
- 78KZMAN
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Thanks again!
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- timebomb33
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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE
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- Patton
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I've been searching for about two hours with no luck so I'm just going to ask. My 78 KZ1000 starts to run poorly at about 5000 rpm. It has a 4-1 Kerker and a K&N stock replacement filter. I ordered a stock OEM filter (as 650ed suggested) from Z1 and will try tomorrow to see if it helps, but my real question is what main jet should I go to if my air filter change doesn't help? My old Clymer manual says the stock main is a 107.5. Roy, you had recommended 112's or 115's thinking the stock jets were 105's. Would you still recommend those sizes? Also, can these be changed w/o removing the carbs? Are these jets available from Z1? I put four new manifolds on a couple of years ago and swore I would never take the carbs off again! I just hope I don't regret anything I do because overall the bike runs well, just not as good as I remember when it was completely stock. I believe everything else is in order, so it would seem that the jetting is the likely culprit. Sorry for all of the posts and questions…..I just can’t remember how to do this stuff anymore.
Thanks again!
Carb removal and replacement is a piece of cake with new soft pliable sensual? airbox hoses from Z1E
If not already done, would assure proper operation of ignition timing advancer unit (watch it move back and forth under a strobe-type timing light while varying rpm by blipping the throttle).
Also check/adjust valve clearances.
Good Luck!
1973 Z1
KZ900 LTD
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- The Gringo
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- ¡Usted no necesita otra motocicleta!
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Andy
Akron, Ohio
80 Z-1 Classic-Sold
84 GPZ1100
79 KZ 1000 LTD
78 KZ 1000 A2
77 KZ 1000 LTD-Sold
76 KZ 900 The definition of a barn find
76 KZ 900-Sold gone to Denmark
KZ 750 times 3, KZ 650 times 8 Sold 1 down to 7
KZ 550 times 2 80 440LTD-Sold
81 CSR 305-Sold 81 Yamaha XS650 Special
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- bountyhunter
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1979 KZ-750 Twin
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- 78KZMAN
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- keith1
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Update: I put the stock air filter back in today and the bike ran much better! In fact, I was able to run up to redline with almost no issues. When I pulled the plugs, they were kind of white, not nice and tan. So, I'm sure it is running a bit lean. All things considered, I think I'll leave it the way it is for now. Thanks everyone for all of your help.
not for nothing, but i would nt run it lean for too long....unless you ride real easy and slow ,below
4k, you will grenade a piston eventually....just my .02.....
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- Gman
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1978 KZ1000
1965 Harly Electra Glide
2002 Gold Wing
1974 Z1 900 project
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- 78KZMAN
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Gman; Prior to your jetting change were your plugs kind of white like mine? Did they turn tan after the jetting?
Thanks.
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- keith1
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keith1; is the possible piston damage due to the lean issue or the hot plug? Would I lessen the potential problem by going to a cooler plug?
Gman; Prior to your jetting change were your plugs kind of white like mine? Did they turn tan after the jetting?
Thanks.
due to lean condition....damage isnt a certainty, but the potential is there.....i m not sure about going to a cooler plug.....
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- Gman
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Yes my plugs were whiteish looking before I changed jetting.The factory just jetted these bikes too lean for optimum performance. I think they were more concerned about exhaust emission standards.
1978 KZ1000
1965 Harly Electra Glide
2002 Gold Wing
1974 Z1 900 project
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