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rediculous backfire, why?
- old_skool_77
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- Woot Woot
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10 Nov 2009 07:49 #332612
by old_skool_77
1975 z1 900
1976 kz 900
1977kz 1000
1980kz 1000 ltd
rediculous backfire, why? was created by old_skool_77
i have a 1975 kz with 1980 z1r engine in. i took the motor out to have something fixed. motor was drained of its oil and upside down for a couple of day. i put motor back in when it was fixed and now i cant get it to start. it will turn over and will back fire out of the exhaust. it is super loup when it pops. thought it was carb issue, so i rebiult them and it still pops really loud and now i got fire comin from the carbs. i did nothing to the motor internally or carbs. what is wrong with my bike? any light shed on this would greatly be appreciated!
1975 z1 900
1976 kz 900
1977kz 1000
1980kz 1000 ltd
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- Grantl
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- KZRider is Da Bomb!!!
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10 Nov 2009 08:21 #332615
by Grantl
1981 KZ1000 CSR
1983 KZ750 Project Bike
1990 550 Zephyr
1994 KZ1000 P
Replied by Grantl on topic rediculous backfire, why?
sounds like your timing is off. Check--using the manual the position of cams--using the marks on the cams to the top of the cam cover when the crankshaft is at the correct timing mark TDC
1981 KZ1000 CSR
1983 KZ750 Project Bike
1990 550 Zephyr
1994 KZ1000 P
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- taildragger1197
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10 Nov 2009 08:27 #332616
by taildragger1197
Union City, Tennessee
1979 KZ1000 LTD B3
1979 KZ1000(1260)LTD S/G Pro ET
1993 ZX11 D1 Ninja
Replied by taildragger1197 on topic rediculous backfire, why?
Sounds like you have you coils/plug wires crossed. :ohmy:
Union City, Tennessee
1979 KZ1000 LTD B3
1979 KZ1000(1260)LTD S/G Pro ET
1993 ZX11 D1 Ninja
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- Patton
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- KZr Legend
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10 Nov 2009 15:14 #332676
by Patton
1973 Z1
KZ900 LTD
Replied by Patton on topic rediculous backfire, why?
If not already done, would also check valve clearances, especially intakes, as a too tight intake valve can allow backfire through the carb.
Good Luck!
Good Luck!
1973 Z1
KZ900 LTD
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- davel
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10 Nov 2009 18:18 #332707
by davel
Replied by davel on topic rediculous backfire, why?
taildragger1197 wrote:
Agreed. These are the symptoms of ignition being 180 degees off (ie cylinders 1&4 are firing when 2&3 should be firing and vice versa. Try switching the wires at the coil.
Sounds like you have you coils/plug wires crossed. :ohmy:
Agreed. These are the symptoms of ignition being 180 degees off (ie cylinders 1&4 are firing when 2&3 should be firing and vice versa. Try switching the wires at the coil.
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- Patton
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- KZr Legend
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10 Nov 2009 18:35 #332716
by Patton
1973 Z1
KZ900 LTD
Replied by Patton on topic rediculous backfire, why?
Usually, left coil with small black wire fires both outside plugs, and right coil with small green wire fires both inside plugs.
Good Luck!
Good Luck!
1973 Z1
KZ900 LTD
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- Old Man Rock
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10 Nov 2009 18:58 #332724
by Old Man Rock
1976 KZ900-A4
MTC 1075cc.
Camshafts: Kawi GPZ-1100 .375 lift
Head: P&P via Larry Cavanaugh
ZX636 suspension
MIKUNI, RS-34'S...
Kerker 4-1, 1.5" comp baffle.
Dyna-S E.I.
Earls 10 row Oil Cooler
Acewell 2802 Series Speedo/Tach
Innovate LC1 Wideband 02 AFR meter
Phoenix, Az
Replied by Old Man Rock on topic rediculous backfire, why?
I'm with the others... Bet a Dr Pepper coil wires are crossed!
1976 KZ900-A4
MTC 1075cc.
Camshafts: Kawi GPZ-1100 .375 lift
Head: P&P via Larry Cavanaugh
ZX636 suspension
MIKUNI, RS-34'S...
Kerker 4-1, 1.5" comp baffle.
Dyna-S E.I.
Earls 10 row Oil Cooler
Acewell 2802 Series Speedo/Tach
Innovate LC1 Wideband 02 AFR meter
Phoenix, Az
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