plz help guys....major misfiring...

[79Jcraft]

I am having problems with spurratic misfiring /backfiring on my 225 looper...its a 1991. seems to have no get up and go and won't get itself to top speed. what should I look for, I am completely lost with it. It ran fine 2 weeks ago short of the idle being too high so it clunks into gear and out of gear....and the T-stat housings were leaking and shorting out the coils...once I dried them it was fine...yesterday it ran like it was soaked but I fixed the leak...just doesn't make sense to meeverything has 50 hours on it supposedly...now seriously doubting it with all the little issues he hid frm me when I bought it...can anyone help..give me an idea as to what could be the issue? It backfires horribly when it starts from cold....

[flabum1017]

Do your basics first.... compression test and spark test. Check for water in the fuel. It's possible the water corroded the ground connection between the coils and the block.

[pyro]

check timing too.

[79Jcraft]

thaks ...gonna go outside right now ond double check the grounds and maybe re-route them...does the motor have to be running to check the timing?

[79Jcraft]

would elevation have anything to do with it? I am in Ottawa Canada which is 262ft above sea level and motor was bought in Tuckerton New Jersey..on the ocean....could it be my jetting is the issue?

[flabum1017]

You said it ran fine 2 weeks prior, so I would not think it's in the jetting. Maybe some crap in the carbs, but do your basics first. 262 feet of elevation is not enough for a jet change.

[79Jcraft]

awesome..that what i was hoping to hear...and appreciate all the help guys..I am dying to see what it'll get my J-craft doing when its runing right...then I'll be hunting down a hydraulic jack-plate...

[bw1969]

Check the flywheel magnets or possibly the hub.

[79Jcraft]

will check that when I get home from work tomorrow...what should i look for ..will i have to yank the flywheel off to do this?