Spark plug # ?

[Shuck Grass]

I have a 05 optimax 150 serial # 1B027977. Can someone tell me the correct NGK PLUG ? The plug I removed is NGK IZFR5G. Not saying it’s the wrong plug, just want to make sure it is correct. Thanks

[JOE54]

ats it for non pxs mtr

[SilverFox579]

Covered in the FAQ at top of forum - Oil, Battery, Spark Plugs, Fuel and Fuel Additive Recommendations

Spark Plugs:
-QL77CC (Champion) for 3 Liter EFI's (XB models or 2001 and EARLIER: .035" / All 2002-> Down-draft intake models: .040")
>>>>-IZFR5G (NGK)@ .032-.033" for Standard Opti's 135-225HP, 2001 200XS, and 200 ProXS PRIOR TO Serial Number#1B912786***<<<<
-IZFR5J (NGK) @.032-.033 for 75-115 Opti's
-IZFR6J (NGK)for 150/175/200 ProXS (200 ProXS Serial #1B912786-up) & 225-250 ProXS and Racing XS Motors
-2006 & prior ProXS: .032-.033"
-2007 & up: .042-.044" gap for best idle performance. (150/175/225/250 ProXS/XS)
- 2007 & up 225-250 XS/ProXS can use NGK- IZFR6J (gapped to .042-.044") OR IZFR6J-11 (pre-gapped, currently a "factory only" plug)
-2007 & up 225 ProXS: .042-.044" (IZFR6J)
-175 ProXS: .042-.044" (IZFR6J)
*** 200 ProXS Models manufactured PRIOR TO 2/1/12 utilize IZFR5G(NGK) Plugs.
*** 200 ProXS Models manufactured AFTER 2/1/12 (Serial Number 1B912786 and later) will utilize NGK- IZFR6J (gapped at .042-.044") due to production changes in the engines.

-IZFR7M (NGK) for 300XS: .044" Gap

[Shuck Grass]

Covered in the FAQ at top of forum - Oil, Battery, Spark Plugs, Fuel and Fuel Additive Recommendations

Thanks

[SilverFox579]

Welcome.

Btw, there are several other very useful topics for your Optimax in the FAQ worth perusing if you're doing your own maintenance.