Re: carburetor isolation/troubleshooting ?
Thought I'd give an update as I always like reading what fixed others problems.
if you say the motor will pick up rpm when the choke is applied oviously means it is running lean. which could be MANY different problems, from dirt in the carb,intake gasket failure, to bad crank seales. you stated that it would hit 4000 rpm if the choke was applied which tells me you have the proper amount of fuel being delieverd to the carbs via the fuel pumps and filters. in a situation like this i always start at the easiest test, which will require two people, the motor must be put under a load in the water. run the motor with the cover removed, when it startes to act up slide your hand over one of the carbs slowly and note the motors reaction (did it run better or worse). then do the same on the second carb, and note the motors reaction again. this in a sense is acting like applying the choke one carb at a time, which if its a carburation issue it will tell you which carb needs attention. if you deside that a carb rebuild is needed i wouldnt waste time of just rebuilding one carb, do both at the same time. if that doesnt correct your problem farther investigation would be needed and the cost and time required will go up. good luck
Thanks for the tip,sliding your hand over one carb a@ a time, motoman. Would have never though to isolate the problem that way.Will definetly keep that in mind for any future troubleshooting.Didn't have a helper handy today so I pulled the lower carb and cleaned all the jets and passage ways.Just got back from a test run and it's back running like it should.Beats paying $125.00 an hour to have it done at a shop or the $110.00 a local shop wanted for a rebuild kit.
