johnson venom problems ugghh!

[jmcoop]

-j200stledm '96-new lower unit (out of the box)-fuel lines all just replaced including from tree to carbs-new fuel ball-no antisiphon in tank (on board)-new fuel filter as per omc manual-removed h2o seperator-compression; 105,104,109,103,102,100-new plugs -advancement adjusted 1 week ago by mech-idle adjusted 1 week ago by mech (700rpm)-checked at 1/2 mark a.o.k.-new vro at end of '03, disconnected oil injection and running 50:1 premix as per mech of previous owner-power head rebuilt in '01 due to disconnected oil line when transum refinished hense why above doneproblem;starts well. sputters a little in idle and dies. leave dock and put motor into gear and it dies sometimes, not usually after it is warmed up at almost wot. tried to pull a skier yesterday and put into gear and then hit the throtte and it died 4 times. had to gradual throttle up and then hit it. what to do??

[Dhadley]

Welcome!!Has it been sitting? Sounds like a good carb bath may be called for.

[jmcoop]

nope it has not been sitting. it came out of storage in may and we have had this type of problem since last year. i took carbs apart and checked the floats and the seats but unfortunately this was not the issue.

[Solittle]

Checking the floats and seats is not a thorough cleaning & rebuild - My bet goes to crud in the carbs.

[jmcoop]

no problemi will clean them thoroughly. what would you use to clean them?

[jmcoop]

no problemi will clean them thoroughly. what would you use to clean them?

[jmcoop]

no problemi will clean them thoroughly. what would you use to clean them?

[MarkHPCA]

Any auto carb cleaner. Take everything apart and soak well (I don't know about yours but my 120 has plastic bowls and the don't recommend soaking these) Blow out ALL the various passages preferably with compressed air and re-assemble with new gasket kits. While you'r at it check the fuel lines to the carbs , mine were getting hard so I replaced them too. Also you may want to clean out the recirculation valves while everything is apart and easier to reach. Carefull not to break any of the plastic hose fittings.

[diggs]

Hey jm coop did the carb rebuild/cleaning do the job. Have the same problem with mine.

[seahorse5]

For a quick check, open up the idle adjustment mixture screws one additional turn. They should be 5 to 6 turns open for most motors.Make sure each thermostat is warming up each cylinderhead to around 140 degrees at idle.The prop should allow the motor to turn up to 6000 rpm with an average load of fuel and folks.The next time it starts to die on acceleration, hit the keyswitch in to "choke" it. If the motor picks up, then you definitely have carb problems.