Ok motor sat for 10 years, started and was running great for a motor that sat for 10 years. But now as the gunk must be breaking free it started as slight bog on low speed acceleration and occasional burp in neutral. The burp was the most concerning. Only noticed in idle but every time it happened it was like the motor was shifting into gear then a slight oil or gas discharge. This was not a popping like I'm use to hearing in a 2 stroke with carb problems but more physical. All I can describe is like thump and I felt engine was going into gear. So I put new plugs in it and some sea foam in gas. That was probably a mistake in hind sight. The burp is still happening at idle and now what was sluggish in low speed has moved to falling apart in the mid range. Full throttle seems to do ok and idle does ok. Maybe more than one issue going on. Any Thoughts on the burp/thump in idle? (only noticed in neutral but maybe it's happening in idle forward and I don't notice. It does only seem to happen after running for a few minutes.
Other things I notice seems to be going through more fuel than I would expect. 20' pontoon driving for 1 hour eats 7 gallons of gas but maybe that's normal. Only achieves about 4200-4500 rpm don't know exactly as the tach only works up to 3800. Top speed at between 18 to 20 mph depending on how many passengers but that is about what I would expect. Motor had NGK BU8H spark plugs but they were not listed anywhere as being applicable so I went with what a Merc dealer told me was the right plug.
I can't even get an appointment for Mechanic they just say call me back in 6 weeks we are booked up. I say no problem how about we make an appointment for 6 weeks. No just call me back and well see if we can work you in.
So I sit here and think should I just order new carbs, aftermarket carbs, rebuild the existing carbs. I'm intimidated with multiple carbs and setting the timing. Seems like I recall that it never felt like the carbs were properly timed from the prior marine mechanic 10 years ago.
Can I access and change the fuel filter without removing the carbs?
Thanks for any thoughts and letting me ramble.
Other things I notice seems to be going through more fuel than I would expect. 20' pontoon driving for 1 hour eats 7 gallons of gas but maybe that's normal. Only achieves about 4200-4500 rpm don't know exactly as the tach only works up to 3800. Top speed at between 18 to 20 mph depending on how many passengers but that is about what I would expect. Motor had NGK BU8H spark plugs but they were not listed anywhere as being applicable so I went with what a Merc dealer told me was the right plug.
I can't even get an appointment for Mechanic they just say call me back in 6 weeks we are booked up. I say no problem how about we make an appointment for 6 weeks. No just call me back and well see if we can work you in.
So I sit here and think should I just order new carbs, aftermarket carbs, rebuild the existing carbs. I'm intimidated with multiple carbs and setting the timing. Seems like I recall that it never felt like the carbs were properly timed from the prior marine mechanic 10 years ago.
Can I access and change the fuel filter without removing the carbs?
Thanks for any thoughts and letting me ramble.
