yamaha 9.9 four stroke

[welshboyjam]

hi guys ,i have had a few problems with my outboard it will run fine for as long as i want it to run when i can get it to start that is. then when i stop the engine the outboard has problems restarting very hit and miss ,after running it in a tank for over a month trying 3 cdi units, i noticed the oil to be creamy so i changed the head gasket ,after that i started it up again running well for 2 mins then i had few little backfires from the carb and the engine spluttering so i stoped it and the same problem again ,hard to start it again , could this be fuel problems ? or the coils ? i have been told the coils by a friend hope someone could help me

[boats.net]

Backfire at low speed could be dirty carb.

[welshboyjam]

Backfire at low speed could be dirty carb.

hi thanks for help just cleaned out carb fully striped and cleaned.but still got problems no more backfire but outboard still hard to start as soon as it starts it runs like a dream sounds sweet .but as soon as i stop it it is very hard to start again sometimes wont start at all . i have taken out plugs both get a spark but a very faint spark at that does it need a very good spark or should it start with a faint spark, i have changed plugs over and still the same , is it a fuel flow problem or poss somthing electrical i am lost any help would be great thanks guys,

[boats.net]

Sounds like a choke problem, did you check diaphram in primer when had carb off.