8.1L Horizon Spark Plug Gap

bmac

Well-Known Member
Jan 11, 2008
1,845
Holbrook, NY
Boat Info
2006 58 Sedan Bridge, Walker Bay Generation 390 RIB w/40hp Yamaha, 2014 Wellcraft 232 CC w/Yamaha
Engines
MAN 900 CRM
I'm away on a trip with firends that have a 2004 340DA with the 8.1L Horizon engines. He's having a problem with the port engine knocking and wants to replace sparkplugs. He's bought the OEM spec'd platinum tip plugs but doesn't have his service manual with him. Anyone know what the plug gaps should be set at?
 
Thanks, Carter. We found the same info on top of the engine cover (duh). Wasn't fun changing the plugs but it's done now and the engine seems to be running better.
 

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