2003 175 STILL missing

[Matty3614]

Was stalling and missing. Did VRO pump, powerhead gasket kit, rebuilt all 6 carbs. ($800 worth of crap and days of work) Now it stays running, but misses. Checked compression, 110 on all except port side lowest cylinder which is 90. Piston heads are clean, no damage to walls, brand new plugs. Now what? Maybe not enough spark on the low cylinder? Power pack? HELP!!!

 

[boobie]

Re: 2003 175 STILL missing

The compression is a little out of spec on #6cyl. You may want to give it a good seafoam job and see what happens. Also get an open air gap spark tester and check the spark. It should jump a 7/16" open air gap.