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    1990 Force 120 2 stroke loss of power high rpm

    Ok. Fuel...fuel line ....air getting sucked in all eliminated. Still drops power at around 4000. Feeling fuel pump. Not sure about carbs tho if worth atteopting anything. Haha...if I did I would k ow what I was doing. If fuel pump....new 9ne not available for this motor. Can I install low...
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    1990 Force 120 2 stroke loss of power high rpm

    Bought boat recently. Been sitting who knows how long with 25 gallons of fuel. Thought may be water. Grasping a straws.
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    1990 Force 120 2 stroke loss of power high rpm

    Gonna start with fresh fuel in portable tank to eliminate bad fuel...air getting in...check valve. If still does it...could carb be issue?
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    Another Guy With Force 120 Issue

    Me neither but then again...i know next to nothing. It's running. Well at least up to 3500 to 4500 rpms then starts surging like it's starving for fuel. It was doing this before. I started a new thread on that issue. It's the final hurdle I have. Thread titled "1990 force 120 2 stroke loss of...
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    1990 Force 120 2 stroke loss of power high rpm

    Greetings I have recently benefited from advise given to me here. All has worked out well. Need to solve final issue with force. Starts great...runs great til about 3500 to 4500 rpms. Motor starts surging. Acts like starving for fuel. I back off throttle almost to neutral and cleans up. I can...
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    Another Guy With Force 120 Issue

    Greetings again. First just want to say thank you for all the help. I think this problem solved. Called mercury service in Charlotte. Tech called the force 120 a bare bones outboard with their own quirks. He suggested all the things you guys did. Ended up testing heat buzzer. Should have done...
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    Another Guy With Force 120 Issue

    I did test it. Checks out ok. Can't put in backwards but can wrong order but not the case here. We've had some cool days here. Going to test alarm. Part of me hopes it's faulty...parts of me hopes not.
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    Another Guy With Force 120 Issue

    Explain this....in an act of desperation I pulled out the brand new 130 degrees thermo and put the cover back on. Boat ran well. I even towed another stranded boater and wife 3 miles to dock. Boat alarm never sounded. Spent time fishing after that.....is 130 degrees too high? It's what's...
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    Another Guy With Force 120 Issue

    Haha. Well ya just have to know Force Power. I can work standing up but working on something low ....is let just say the years have caught up with me. I'd have to work from the ground up and my old body can't do it anymore.
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    Another Guy With Force 120 Issue

    Well. Took to water and it pumps water. But still over heating. All 4 cylinders hit 180s under idle and high idle. I'm at a loss. Very discouraged not beaten but discouraged Force Power....gonna call a shop tomorrow and try the impeller. I'm not able to tackle it. Just can't imagine. Water...
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    Another Guy With Force 120 Issue

    Well. Took to water and it pumps water. But still over heating. All 4 cylinders hit 180s under idle and high idle. I'm at a loss. Very discouraged not beaten but discouraged.
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    Another Guy With Force 120 Issue

    Thanks. Will make attempt after work today after I put back together again. I may attempt running a stream of water backwards from the tell tale first. Should that not verify clear passages if it comes out water intake vents at bottom of engime?
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    Another Guy With Force 120 Issue

    Yes. Exact match on the gasket and no did not remove lower unit.. The motor sat a week with head off and motor was trimmed down as low as it would go. Is it possible that all water has drain or evaporated to point that it would need to be primed?
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    Another Guy With Force 120 Issue

    It was on double ears from garden hose. Done before.
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    Another Guy With Force 120 Issue

    Greetings Well truly am befuddled now. Put everything back together. Started fine but pumped zero water. Overheated almost immediately. Double checked that I'd put thermo back correct and it was. Was pumping water beautifully before removed head. Water never made it to back of head or from tell...
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    Another Guy With Force 120 Issue

    Greetings all Parts all clean ready to go back on. Apparently there is no gasket between cylinder head and cover. Can y'all recommend what sealant for head? Uneasy about it cause it's a marine engine.
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    Another Guy With Force 120 Issue

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    Another Guy With Force 120 Issue

    Thanks for checking you 2 men have helped this old man a lot. I appreciate whether it fixes the issue or not. Will update y'all when I find gaskets and put back together...
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    Another Guy With Force 120 Issue

    Thanks. We let y'all know how it's coming .I'd given up being back on water this year but if this is the issue....theres still time. Fingers crossed
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    Another Guy With Force 120 Issue

    Also...should there be a gasket between the cover and head?
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