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Hi , My name is Parker , I'm up here in Prince George BC, Canada.
I recently purchased a used 120 HP Johnson that had its powerhead rebuilt ,( Verified 120 PSI) it was broken- in then stored for 7 years..... I have it mounted on my 18'5' Fraser raider, and it won't idle smoothly ,then it dies. at full throttle it won't make 5800 rpm Spec and surges between 5000 and 5200 rpm, then dies when I throtle back. running 50:1 fuel/oil mix with Marine 91 octane. water impeller seems to be ok with a good strong stream.
So far I've changed and gapped the plugs, repaired a bad plug wire, Replaced all the hoses from the fuel tank to the fuel pump ,including the squeeze ball, and all the water lines I could reach with clear urethane ,Just replaced the Fuel side diaphram on the Disabled VRO fuel Pump,Checke total timing at WOT and only got 16 degrees...the cover says 22 degrees
I'm truly at my wits end. HELP!!!
MAC
I recently purchased a used 120 HP Johnson that had its powerhead rebuilt ,( Verified 120 PSI) it was broken- in then stored for 7 years..... I have it mounted on my 18'5' Fraser raider, and it won't idle smoothly ,then it dies. at full throttle it won't make 5800 rpm Spec and surges between 5000 and 5200 rpm, then dies when I throtle back. running 50:1 fuel/oil mix with Marine 91 octane. water impeller seems to be ok with a good strong stream.
So far I've changed and gapped the plugs, repaired a bad plug wire, Replaced all the hoses from the fuel tank to the fuel pump ,including the squeeze ball, and all the water lines I could reach with clear urethane ,Just replaced the Fuel side diaphram on the Disabled VRO fuel Pump,Checke total timing at WOT and only got 16 degrees...the cover says 22 degrees
I'm truly at my wits end. HELP!!!
MAC