Blue Needs Help! - Page 4

THEFERMANATOR · #31 06-16-2008, 04:59 PM

WILLY had the right idea as to what I was getting at, except I would pull one plug wire off with it NOT running and then run it. This way you can pull the wires without turning into SPARKY. Only pull one wire at a time, but if you pull a wire off and you notice no change in the engines performance then you found the weak cylinder.

Blue_Runner · #32 06-16-2008, 05:15 PM

Ok, Mulv I know its not the spark plug itself because I replaced them before the Hatteras trip (5/22) and all was well until recently when it started acting up. Now I've changed all 6 plugs again and no difference.

Thanks for the tips. I'm resting a bit after work. Gonna let it cool off just a little before I go out there.

Blue_Runner · #33 06-16-2008, 06:08 PM

Ok, it is definitely 1 cylinder not firing. So now I suppose I have to determine whether it is fuel or spark right? What is the best way?

Clean as a whistle - the only one that obviously isn't doing its thing:

Facing the rear of the motor it is the top right cylinder:

Airslot · #34 06-16-2008, 06:12 PM

Swap plug wires with another cylinder and see if the problem follows the wire. Then you can eliminate the plug wire from the equation.

Airslot · #35 06-16-2008, 06:22 PM

After that I'd swap coils with another for the same reason.

THEFERMANATOR · #36 06-16-2008, 06:24 PM

Does the plug have any signs of fuel on it? If not I would suspect the carb for a problem. If it is wet, but clean then I would suspect ignition(or water). Remove that plastic cover from the rear of the engine and then swap that coil with another and swap the wire with it as well. If the problem stays on that cylinder then it isn't the coil or wires. If you suspect fuel, then remove the airbox cover and start the engine. Bring the RPM's up to around 2500 and check for airflow through the carbs. If air is flowing through it, then spray some WD-40 in the top carb port side(the carbs feed the cylinders on the opposite sides of the engine) and see if the RPM's increase. DON'T USE STARTING FLUID OR CLEANERS FOR THIS! They will wash the oil off the cylinders and burn a bearing or cylinder REAL QUICK! WD-40 has enough lubrication to it to prevent damage but still potent enough to fire the cylinder. Also pull the drain screws as a piece of trash over the main jet can shut down all of the fuel to that cylinder.

Blue_Runner · #37 06-17-2008, 07:45 AM

Slot and Ferm, thanks for the ammo. My buddy is supposed to bring over one of those gadgets Mulv mentioned to test for spark. If he does I will first check for spark and then perform the above mentioned tests.

If it turned out to be a coil, how much do those boogers cost?

Wish me luck!!

P.S. Ferm no sign of fuel on that plug, however it had not run in a day or two. Probably best to run it for a minute then check for signs of fuel.

Airslot · #38 06-17-2008, 01:53 PM

Coils should be fairly inexpensive...< 30 or so?

Blue_Runner · #39 06-17-2008, 01:57 PM

Yeah, after I asked that dumb question I looked it up online....duh!

Thanks man!

Blue_Runner · #40 06-18-2008, 07:42 AM

Performed a spark test yesterday evening and I'm getting spark on all 6 so it has to be a fuel problem to that top right cylinder.