1995 Force 120 # 3 & 4 cyl not participating

[yar853]

My 1995 Force engine (after winter storage) has low power and rough running while trying to plane out and missing while running WOT, not getting to full rpm. I pulled and rebuilt carbs and replaced plugs, still same result. Checked plugs #'s 1 & 2 black ends and firing, #'s 3 & 4 clean like new. Checked spark and all coils are firing. pulled plug wires while running #1 makes rough idle, #2 same result, however #3 no change in how engine idles and #4 same result. Engine idles same without #3 & #4, both carbs spraying gas upon reving. Getting gas, new plugs firing, can't get miss out or hp up to snuff. can you help before I take it to a dealer?

 

[jerryjerry05]

Re: 1995 Force 120 # 3 & 4 cyl not participating

First do a compression test then a spark test.Then check the fuel pump diaphram then the reed valves.Post your results.J

 

[yar853]

Re: 1995 Force 120 # 3 & 4 cyl not participating

Ok, Compression up to 155 in each cyl. Switched coil positions, good spark on all cyl's. Still #1 & #2 carry all the power load and #3 & #4 do nothing. Pulling the plug wires off of 3 & 4 have no effect while at idle, pull 1 or 2 and the engine just about dies.

 

[jason32038]

Re: 1995 Force 120 # 3 & 4 cyl not participating

Check your wiring. I had that prob a while ago...loose cd wire was causing cylinder to not fire.

 

[Surlaw]

Re: 1995 Force 120 # 3 & 4 cyl not participating

I've got an older 1989 force 125 hp and had problem with no fire in #3 cylinder. I used a timing light on all plug wires to find it didn't fire under load. I traced it down to CDI ignition pack being bad. I suppose it could have been trigger or loose wire but for me it was the ignition pack and now it screams. Fortunately I have another force 125 in my garage taken apart so I was able to use ignition pack from that motor. Otherwise they cost $200+ for a new one. I hope yours is just a loose wire.