odd plugs ??

double check the resistance on your plug cap the coils are paired if the coil quits both 1-4 would quit firing try swaping the leads from 1-4 and see if no 4 fires.

Triggerbilly, More thoughts. No fire on #4 or no spark.? If spark but no life, a compression chk is in order. if compression is good, check for air leaks. if none, your' off to carb land. dry/sooty plug fouling is an indication of lean mis-fire. a wiring glitch in harness would logically take out #1 as well. I would, throw a clean plug in #4 cap, ground to head and chk for spark.if present, reinstall fresh plug/cap and spray intake w/wd40 or equvilant & listen for idle to pick up. Just more ammo mate, keep us in the loop. G

I would still suspect either the plug wire or the resistor plug.

Is a compression check needed ? two days ago the water i was squirting was sizzlin' off all the pipes.

I'll go check and see if the spark is weaker on #4
and check the plug leads try and swaping the leads

OK
I'M A BIG STUPID NOB-HEAD !!!!
I just started it up 3 cylinders firing.
bang on #4 plug cap with the palm of my hand
and it suddenly starts to get warm !! then warmer and warmer !!!

So i guess the plug cap wasn't sitting on the plug properly

sorry for wasting your time
( i should check stuff out more, rather than running straight to this forum)

I am learning from it though !!

thanks

T, probly not, but would be a quick check for tight/carbon opened valve without going inside to check clearances. as brother O offerd, plug cap/wire is most likely candidate, and I mentioned in 1st post. just trying to get most info easiest. luck G

gane wrote:

T, probly not, but would be a quick check for tight/carbon opened valve without going inside to check clearances.

how would i do this
you might have figured out already, I ain't too clever YET !!

What happened here? fore some reason I can not open this thread. If I go to the edit/response section to add a comment than i can read the previous comments but not in the read mode only???????

I might have fixed it, time will tell.

Just started working again Huh:blink: It works, thank you Tony.:kiss:

cool !!

Thought i'd broke the forum then, as well as my bike !!!!

triggerbilly wrote:

...started it up 3 cylinders firing.
bang on #4 plug cap with the palm of my hand
and it suddenly starts to get warm... guess the plug cap wasn't sitting on the plug properly....

guess the plug cap wasn't sitting on the plug properly -- Not necessarily. Depending on the application at hand, might be a weakness in the plug wire > cap connection.

Some caps have a metal point inside that "threads" into the center core of the plug wire. Sometimes this connection get mangled. May be able to snip off a bit of plug wire to afford a better grip/connection when re-attaching the cap to the wire end.

Combustion within cylinder as evidenced by hot exhaust header does not assure either compression or valve clearances being up to specs.

And spark plug that wouldn't fire may simply be already fouled beyond recovery. Would test spark quality with a brand new NGKB8ES spark plug, and install four brand new NGKB8ES spark plugs after resolving any compression and spark quality issues, all before resuming further attention to carbs.

Am thinking the hotter B7ES plug was perhaps being used as a stop-gap measure to help maintain combustion in a weak cylinder already suffering from a deficiency in spark quality, compression, or fuel mixture, or some combination thereof.

Good Luck!