MacroMarine
New member
Engine usually starts at first try. When running at 90/95% speed the engine is after around 90 secs slowly loosing power/rpm's and finally bogging down. I stop the engine and restart then it runs for 120-180 secs before slowly loosing power/rpm's and finally bogging down. When pushing the Primer (using the key) the rpm is going up...
The separate tank (scepter) is emptied, dried and cleaned, new fuel hose with primer bulb (mercury oem) from tank to motor. Tank screw open and working properly. The primer bulb is not getting flat when bogging down. Replced the hoses from the engine intake to fuelpump, from fuelpump to filter and from filter to carb. Filter is cleaned and the fuelpump is renovated. The cooling water runs perfect. Impeller is replaced. Spark plugs are looking good (replaced 6 months ago). Thermostat replaced 1 year ago. Compression for both cylinders 120. Both seesm to work properly. Sparks tested and OK. Carburator pro-cleaned with ultrasound 2 years ago. Only OEM spare parts used. I have not replaced the vacuum hose to the fuelpump?
What should be the next logical step?
The separate tank (scepter) is emptied, dried and cleaned, new fuel hose with primer bulb (mercury oem) from tank to motor. Tank screw open and working properly. The primer bulb is not getting flat when bogging down. Replced the hoses from the engine intake to fuelpump, from fuelpump to filter and from filter to carb. Filter is cleaned and the fuelpump is renovated. The cooling water runs perfect. Impeller is replaced. Spark plugs are looking good (replaced 6 months ago). Thermostat replaced 1 year ago. Compression for both cylinders 120. Both seesm to work properly. Sparks tested and OK. Carburator pro-cleaned with ultrasound 2 years ago. Only OEM spare parts used. I have not replaced the vacuum hose to the fuelpump?
What should be the next logical step?
