Helo all, I am new to this forum but have been reviewing it for a awhile. Anyway, not an engine or boating newbie, but not a certified mechanic either.
Bought a 'new to me' boat last month, engine is AQ125a/270 outdrive, I believe a 1984 (84 stamped on block in two sites, only made few a few years), serial number 7679013352.
Had not been weatherized when I obtained. Would turn over but not stay on. Had local boat mechanic work on it and now runs very well at idle. He did not rebuild carb because he said the Sierra rebuild kit I purchased, 18-7000, from another marina was the wrong kit (looks correct to me though). Also changed engine and outdrive oil, new oil filter and water impeller.
Put in water 2 weeks ago, would idle fine, as soon as I tried to throttle up, would bog down and spit and backfire. Was able to cruise just in gear after warmed up.
Pulled out of water, replaced fuel filter last week, put back in water, able to tease it up to full throttle, but tach was broken so don't have numbers. Actually able to innertube my 80lb daughter awhile. No throttle response, tendency to bog down and backfire.
Yesterday, replaced fuel lines from tank to fuel pump, put in water and still doing same thing. I hooked up an auto tach and brought along old GPS, once able to open up wide, was turning 35-3600 rpm at WOT, speed 25.8 gps (23-24 indicated). (Boat is a 1974 18ft Glastron-Carlson CV-18ss) Temp was running at 180. Ran great for a good 10 minutes.
Turned off, threw 120 lb son in water with small inner tube, same problems started. Would start, run great in neutral, put in gear and sputter along, if I tried to throttle up, no good. Changed to daughter (see above), did a little better but still bogging down. Pulled tube back in (and daughter, lol) and now it gave me tons of trouble trying to get back to ramp. Finally able to get it cruising around 10 mph or so, but never wanted to get back to smooth.
That's where I am at right now. Additionally, ran with and without fuel cap on to see if vent was working, did not seem to make a difference. Also, fuel filter never completely fills with gas, but not sure that is a problem? Under load filter looks less than half full, 3/4 at idle. Put 10 gallons hi-test gas in before going out yesterday. Also on second bottle of gumout carb cleaner additive.
Last info, prop is chewed up a bit, it is an old michigan wheel, left hand, 14 x 17 (guesstimate) with some nicks and two blades with nickel sized pieces missing. I am having repaired this week.
So, pending your help and advice, I am planning on rebuilding carb this week, it is the Solex 44PAI assembly with Sierra carb kit 18-7000. I am going to purchase a NAPA marine fuel pump, M-60029, according to another thread will work on my engine, in case it doesn't improve after the carb is rebuilt. My goal is improve throttle response well enough to ski, get closer to 5000 rpm wot(guess per Clymer manual which doesn't list WOT for 125a) and decrease amount of times that engine has to be started to get moving
Thanks for any and all help,
John
Bought a 'new to me' boat last month, engine is AQ125a/270 outdrive, I believe a 1984 (84 stamped on block in two sites, only made few a few years), serial number 7679013352.
Had not been weatherized when I obtained. Would turn over but not stay on. Had local boat mechanic work on it and now runs very well at idle. He did not rebuild carb because he said the Sierra rebuild kit I purchased, 18-7000, from another marina was the wrong kit (looks correct to me though). Also changed engine and outdrive oil, new oil filter and water impeller.
Put in water 2 weeks ago, would idle fine, as soon as I tried to throttle up, would bog down and spit and backfire. Was able to cruise just in gear after warmed up.
Pulled out of water, replaced fuel filter last week, put back in water, able to tease it up to full throttle, but tach was broken so don't have numbers. Actually able to innertube my 80lb daughter awhile. No throttle response, tendency to bog down and backfire.
Yesterday, replaced fuel lines from tank to fuel pump, put in water and still doing same thing. I hooked up an auto tach and brought along old GPS, once able to open up wide, was turning 35-3600 rpm at WOT, speed 25.8 gps (23-24 indicated). (Boat is a 1974 18ft Glastron-Carlson CV-18ss) Temp was running at 180. Ran great for a good 10 minutes.
Turned off, threw 120 lb son in water with small inner tube, same problems started. Would start, run great in neutral, put in gear and sputter along, if I tried to throttle up, no good. Changed to daughter (see above), did a little better but still bogging down. Pulled tube back in (and daughter, lol) and now it gave me tons of trouble trying to get back to ramp. Finally able to get it cruising around 10 mph or so, but never wanted to get back to smooth.
That's where I am at right now. Additionally, ran with and without fuel cap on to see if vent was working, did not seem to make a difference. Also, fuel filter never completely fills with gas, but not sure that is a problem? Under load filter looks less than half full, 3/4 at idle. Put 10 gallons hi-test gas in before going out yesterday. Also on second bottle of gumout carb cleaner additive.
Last info, prop is chewed up a bit, it is an old michigan wheel, left hand, 14 x 17 (guesstimate) with some nicks and two blades with nickel sized pieces missing. I am having repaired this week.
So, pending your help and advice, I am planning on rebuilding carb this week, it is the Solex 44PAI assembly with Sierra carb kit 18-7000. I am going to purchase a NAPA marine fuel pump, M-60029, according to another thread will work on my engine, in case it doesn't improve after the carb is rebuilt. My goal is improve throttle response well enough to ski, get closer to 5000 rpm wot(guess per Clymer manual which doesn't list WOT for 125a) and decrease amount of times that engine has to be started to get moving
Thanks for any and all help,
John