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Only firing on no. 2 and 3

Started by Scottie1, March 12, 2019, 11:34:31 AM

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Scottie1

March 12, 2019, 11:34:31 AM
Hello my fellow FJ gurus. On first start up my bike on my gets hot on number 2 and 3 exhaust. It's also rough on start up for about 1 minute then all four cylinders kick in and it runs good. It's just the initial start up until it's warm. Being 1 and 4 are in the same coil could it be a bad coil. I have a new battery and the carbs have been cleaned and balance.
1986 FJ1200
1982 XJ750 R Seca

Pat Conlon

#1
March 12, 2019, 11:54:39 AM
Could be the ignition coil.
Could be a dodgy power supply to the ignition coil.
Could be the pick up coil that triggers the ignition coil.
Could be the wires and connectors between the two.

1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

FJ_Hooligan

#2
March 12, 2019, 01:57:32 PM
Quick test to help isolate.

Swap the plug wires between 2/3 and 1/4 then swap the coil connectors (I believe they are interchangeable).

If 1/4 fire and 2/3 do not then it's the coil. 

If 2/3 continue to fire and 1/4 do not then it's not the coil
DavidR.

balky1

#3
March 13, 2019, 08:24:15 AM
Bad spark plug will do that, although it is a bit suspicious to be 1 and 4 at the same time. But who knows.


FJ 1100, 1985, sold
FJR 1300, 2009
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