RedDog382

Sounds like it could actually be a little lean, especially if one idle screw was all the way in. Some carbs have 4-corner idle adjust screws and tune much better. I lash my boat to a stout dock and drop it in/out of gear to adjust idle mixtures.

offthefront

iTrader: (1)

These have the 4 corner idle mixture screws ... and every one of them was at a different setting .. and the spec sez they all should be close to the same ...and you could be right a lean condition ..no fuel no idle then when you would open the throttle it would dump a ton of fuel and flood ... Or on cold start up ... you would have to pump several times ..dumping a lot of fuel and hence ..a small fire ... cant wait to try it dead cold ... yesterday after all the adjustments it was bump the key and fire right up ....m

jeff1000man

I've noticed that the big carbs - 800's and 850's start hard whn they are cold on 502's and smaller engines. I usually have to work the throttle while cranking initially to keep them from flooding. After the engines are warm though, it is one bump to start them.

I think you hit the at least the major problem with the idle screws. That is huge.

If it it still rough, there might be a tiny piece of trash in the metering block or in the needle and seat.

Have the air bleads been changed on the carbs or drilled out?

offthefront

iTrader: (1)

brand new never touched ... I swear they are sweet now ..I know I need check float levels and Jetting but yesterday I was alone and need someone at the swtich to check the float levels... I did crack the sight screw and fuel tried to seep out ...with the motor off so not sure if that tells you anything ....m

Griff

Fuel should barely trickle out with the boat at rest.