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Stumped! Carbs valves electrical or what?
- Dirtyhands
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I got the float level tool and set the levels but plugs 3&4 are still carbon fouling. I even went as far as to set those problem plug's float height to 4mm below the gasket but no luck. I can take the plugs out and clean them off with a contact cleaner and wire brush and the bike runs fantastic for a while until enough carbon builds up on those two plugs once again. I've put new plugs in and tried switching cleaned ones between cylinders and it's always 3 and 4 with the problem At one point I backed the air mixture screws in those two carbs like 3.5 turns just to see what would happen and the bike acted like it was lean ( it lingered up in the rpms when i bumped the throttle) so I put them back down to 1 turn out (where it stops acting lean) and ran the bike only to have em foul again. Is the dry powdery carbon fouling always caused by either the carbs or electrical system?
What plug would you guys recommend for my set up? I've got b8es in now but have also run the stock b7es with the same results.
1977 KZ650B
KZ750H Motor Installed
gpz750 Intake cams Kz750 Exhaust Cams
VM28SS Mikuni Pumper Carbs
Elecrosport Stator and Regulator Rectifier
Dyna 3ohm coils
Derale Oil Cooler
4into1 delkevic Pipes
Pod Airfilters
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- Patton
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- KZr Legend
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Dirtyhands wrote: . . . #4 spark plug is carbon fouling and other 3 range from great to a bit rich looking. . . .
Dirtyhands wrote: . . . plugs 2 & 3 are still carbon fouling. . . .
:huh: #4 no longer fouling?
Incomplete combustion can result from issue(s) involving carburetion and/or ignition and/or compression.
Results of cold compression tests?
Would double-check valve clearances.
Possibly a problem with one or more of the BS30/97 air jets.
Might also benefit from new pilot jets.
Good Fortune!
1973 Z1
KZ900 LTD
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- 1977-Z1-A1-LTD
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1977 KZ1000 LTD
1990 FXR
1998 KTM 300 EXC
1974 CBR 350
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- 650ed
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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- SWest
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- 10 22 2014
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Steve
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- spdygon
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I ran my 77kz1000 for nearly 20kmiles smoking and little gas dripping from the over fill tubes with no problems. Started and ran like hell every time.
Did cost me a quart of oil every week thou..lol
1982 GS1000sz Katana ( #15...17K Miles)
1982 GS1000sz Katana ( # 297....7100k Miles)
1978 Kz1000 Z1R. 10K Miles1
1978 kz1000 z1r 27k miles
1977 KZ 1000 A ( Project ) 54K Miles
1976 Kz900A4 (Red)21K miles
1976 Kz900A4 ( Red)7500 miles
1974 Z1 900 project
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- 1977-Z1-A1-LTD
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1977 KZ1000 LTD
1990 FXR
1998 KTM 300 EXC
1974 CBR 350
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- Dirtyhands
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I've attached the latest plug portrait as well 1-4 is bottom up
1977 KZ650B
KZ750H Motor Installed
gpz750 Intake cams Kz750 Exhaust Cams
VM28SS Mikuni Pumper Carbs
Elecrosport Stator and Regulator Rectifier
Dyna 3ohm coils
Derale Oil Cooler
4into1 delkevic Pipes
Pod Airfilters
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- Patton
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- Posts: 18640
- Thank you received: 2098
Dirtyhands wrote: . . . the PO was running a 135 main and 20 pilot with a higher needle setting . . . .
Would use the jet needle's middle clip position.
Good Fortune!
1973 Z1
KZ900 LTD
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- KZB2 650
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Hey Patton school us on the air screw and sync too will ya please .... it seems like I remember you saying it should be under 1 turn maybe 1/4 or 1/2 turn out from closed way back and also they should only be bench sync'd cause with the tops off and adjusting them with a sync gauges they will be off as the slides leak air and throw you off.......... I will admit the 2 times I used a ground rod to bench shim them they were closer than I ever had them with the mercury sync.
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket.
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- 650ed
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KZB2 650 wrote: A lot of us have re used the valve gasket over many times without replacing..........
That's for sure! I'm only on my second one after 38+ years! Be sure to put the gasket on dry (no sealer, gunk, goop, etc.) as that will make removing the cover very easy without damaging the gasket. Unless someone has damaged the head or cover, it won't leak. Considering how many fasteners are holding that valve cover on it's pulled down pretty darn tight! Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- jackleberry
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1997 KZ1000P (P16)
2001 KZ1000P (P20)
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