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View Full Version : 225 Opti fouling 1 plug



150aintenuff
04-03-2018, 05:56 PM
2008 225 Optimax new Chris carson reeds (stockers were all sorts of fubar) cyl 2 had worst breakage on stock reeds will run 2 days worth of use (3-4 hrs ) then foul out cyl 2 spark plug, clean plug will run about 2 hrs of engine run time and refoul plug, no codes, good spark, cyl walls look ok on bore scope compressions ok and even,

air and fuel injectors appear to be functioning perfectly as well, ring free ran through the system after reed replacement and ran great, for 2 hrs of engine run time.

coil tests good
air injector cycles good
compressor pressure 85 PSI
fuel pressure 97 PSI
what am i missing??

marks86
04-03-2018, 06:12 PM
I had the same issue on my 225optimax turns out the plug gap was way off.

150aintenuff
04-03-2018, 06:52 PM
these are the IZFR5G gapped to .032

150aintenuff
04-03-2018, 06:53 PM
swapping FUEL INJECTOR from 2 to 4 and see if the problem moves if it does ill swap the injectors with a new one i have

Motv18
04-03-2018, 09:50 PM
Scope the air bypas for a chunk of reed on #2 opti gets air through compressor and standard ports.

i assume its rich fouled.