15hp Chrysler Misfire - Need help

[luckystriker]

Went out over the weekend for a run. Engine ran OK for two or so hours. Towards the end of the run, a misfire type symptom appeared.
With WOT and low RPM this "misfire" happened every 3 or 4 seconds. I checked the bulb and release valve on tank and that all seemed fine.

For a few minutes, "forward" would also not engage, but eventually did.

I need help listing where to start looking and where to stop looking ( Most obvious and less expensive to the extreme.

Outboard is 15HP code: 152HA (1976-1977 i believe)

Edit: It starts and idles just fine.

 

[jerryjerry05]

Re: 15hp Chrysler Misfire - Need help

Check for :water in the fuel,fouled plugs,weak spark.J

 

[luckystriker]

Re: 15hp Chrysler Misfire - Need help

Update:

Took the plugs out last night, they looked fouled. Brown ash type grit, although not THAT bad. Will insert new ones.
Checking the fuel tonight for water.

Edit: Tested for spark last night but didnt see any spark, either of the plug or spark jump to screw driver.....Could it be that i need someone to go crazy on the pull cord instead of me just turn the flywheel with one hand ?

 

[jerryjerry05]

Re: 15hp Chrysler Misfire - Need help

At almost EVERY autostore(Auto Zone $5.99)sell sparkies(spark tester).Get one or two,hook them up.
You turning it over by hand won't generate enough power to fire the plugs.J

 

[luckystriker]

Re: 15hp Chrysler Misfire - Need help

Plugs are OK
And no water in the petrol.

I have not tested the Spark yet, will do this weekend.
Is it worth it to pull the flywheel off so long? If so, can anyone with a manua?l tell me what the gap should be on the points and what the NM rating is too bolt the flywheel back on ?

(i have tried and failed to source a workshop manual)