99 Johnson 2 stroke motor problems?

[Wayne West]

I just bought a Pontoon boat and was told the bottom carb was giving problems to spray cleaner in there and it'll work, well tonight I went to go out and as I was trying to back off the trailer it just kept bogging down when I put it into gear.. But when I have the water hose connected to it and rev it up for a minute or so it runs fine on land.... Someone said it's possibly the shifter not having enough power under water and just bogging down but I just want to see what everyone else thinks it could be? Thanks in advance..

 

[Boobie]

Do a cylinder drop test on it to see which cylinder isn't running.

 

[vics]

You dont say what motor it is Always quote full model details and /or model number

Spraying carb cleaner into carb is unlikely to do any good......... IF a carb needs cleaning the only effective way is to dismantle and clean all jets and passages etc and preferably rebuild with a carb kit

Do a cylinder drop test as Boobie suggests. This will identify a non firing cylinder. Check plugs by swapping them around and repeating the drop test.

Check sparks using a spark tester.

If sparks all good do a compression test. Cyls should be within 10% of each other.

If compressions good and sparks all good consider a carb clean but there could be numerous other reasons for the problem.

Dont understand what this " someone" is saying about the "shifter not having enough power under water"

 

[kimcrwbr1]

Put the engine in a barrel of water when testing it at home it is the backpressure that is telling you somthing is wrong. I wouldnt run it for any amount of time until your sure it is getting enough fuel on all the cylinders. For sure start from the beginning do a good compression test with a fully charged battery. Pull the spark plugs and ground the spark plug wires so you dont damage the ignition system. I test all the cylinders three times through to account for any mistests. 1-4 1-4 1-4 depending on how many cylinders and take the high number for each cylinder. Get back here with the numbers. Use a open air spark gap tester you can check for spark while testing compression. The spark must jump a 7/16 inch gap with a brite blue snap.

 

[kimcrwbr1]

http://www.ebay.com/itm/Thexton-404...908350?hash=item4d365343fe:g:jbcAAOSwwbdWLkKG
I use this one and works just fine.

 

[faztbullet]

Pull the spark plugs and ground the spark plug wires so you dont damage the ignition system.

Old wifes tale as it wont hurt ignition system, you do this so mixture exiting cylinders when cranking dont ignite.