running lean?

  • jacksdad
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03 Aug 2011 01:14 #466519 by jacksdad
running lean? was created by jacksdad
hey gang, I been reading quiite a few posts, but can't find a definative answer, is popping at idle, and surging at DEceleration a sign of running lean, I son't have the normal mixture screws that everyone else seems to have, mine only turn about 3/ of a turn, they are plastin and right infront of the choke, I turned the one that seems be popping, to ne difference, thanks in advance. Dave

1979 kz750 twin cyl.

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03 Aug 2011 02:08 - 03 Aug 2011 02:09 #466526 by bountyhunter
Replied by bountyhunter on topic running lean?
Popping on deceleration (throttle closed) is definitely lean.

When my pilots were too rich, it would surge at a steady throttle opening (like holding at 2k RPM in first gear).

1979 KZ-750 Twin
Last edit: 03 Aug 2011 02:09 by bountyhunter.

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04 Aug 2011 02:55 #466745 by garnermartin64
Replied by garnermartin64 on topic running lean?
Hey Try syncing the carbs. and then check the valve clearance this might be the problem what kind of bike you working on if it has a lean pop the choke could also be the problem. Have you cleaned the carbs. and if so check the carburetor mounting rubber boots with starting fluid around any spots if you hear any change in acceleration you have an air leak hope this helps and as always don't give up.;)

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  • Motor Head
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04 Aug 2011 11:17 #466784 by Motor Head
Replied by Motor Head on topic running lean?
Is yours the B4 model?
here is a picture of the carb parts. You may still have the #79 plastic cap/ limiter which won't allow for much adjustment. But checking for air leaks and having dirty carb circuits will be issues that must be addressed. If you pop off these caps, then you can remove the mix screws, spray some carb clean into the passage. Might help, but really a through cleaning is more than likely required. As if these caps are still in place, they are most likely Virgins.


1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
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04 Aug 2011 11:42 #466789 by otakar
Replied by otakar on topic running lean?
Did you do a thorough cleaning of the carbs? The mixture screws are standard the black caps that are on them that limit the amount of adjustment can be just pulled off.

74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
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81 Scratch built GPz1150R
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04 Aug 2011 22:52 #466898 by jacksdad
Replied by jacksdad on topic running lean?
I know my carbs are clean, and instead of a lean condition, I am thinking that I have a plug going bad, also, this thing looses momentum going up hills, its not too bad, like 5mph and maybe 2000rpm's, almostlike a car that has a blocked cat. converter, what you guys think I could do to prevent this, it only really happens at above 60 (4500 rpm)I shift at about 5000 rpm's everytime, should i wind it up a little more? thanks gents Dave

1979 kz750 twin cyl.

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04 Aug 2011 22:55 #466899 by jacksdad
Replied by jacksdad on topic running lean?
valve adjustment is on the list for winter project, along with finding a painter for the tank and one side cover that I have, as well as fork work and maybe track down another seat, like a king/queen type

1979 kz750 twin cyl.

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04 Aug 2011 23:31 #466919 by moneypit
Replied by moneypit on topic running lean?

jacksdad wrote: I know my carbs are clean, and instead of a lean condition, I am thinking that I have a plug going bad, also, this thing looses momentum going up hills, its not too bad, like 5mph and maybe 2000rpm's, almostlike a car that has a blocked cat. converter, what you guys think I could do to prevent this, it only really happens at above 60 (4500 rpm)I shift at about 5000 rpm's everytime, should i wind it up a little more? thanks gents Dave


Make sure your air filter is good and clean I had the same trouble years ago with loss of power on hills or when triing to speed up quickly
Good luck B)

2-76 kz900
St Paul MN

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05 Aug 2011 00:43 #466954 by jacksdad
Replied by jacksdad on topic running lean?
OK, about the air filter, it is pretty clean, but it does have a gasoline oder to it, is this a bad deal, or something that normal? thanks again

1979 kz750 twin cyl.

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05 Aug 2011 10:15 #466995 by Patton
Replied by Patton on topic running lean?

jacksdad wrote: OK, about the air filter, it is pretty clean, but it does have a gasoline oder to it, is this a bad deal, or something that normal? thanks again


Would sniff-test crankcase oil and examine its physical condition, to determine whether oil has been contaminated/diluted with gasoline.

Good Fortune!:)

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05 Aug 2011 11:02 #467002 by jacksdad
Replied by jacksdad on topic running lean?
i have done the sniff test, and it does not smell like gas. thanks

1979 kz750 twin cyl.

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