Engine tuner

[barrell]

My boat gets run year round at least 4 days a week. Ive never used an engine tuner before and never had any carbon problems. Should I be cleaning out the carbon? How often?. Zuke115.

[mitch]

yep try running yammy ring free its dear but works well i thought this was snake oil until i tried it.

this site has it on special have a look in the yammy section