Re: yamaha 150 etx outboard
I sometimes have the same problem and am interested in whatever others have to share on this.<br />With the experimentation I have done on this, it seems like it comes down to whether to use the choke when restarting or not. I would lean toward using it if off for 15 to 20 minutes.<br /><br />When 'cold' my Yamaha 150 (1986) needs the smallest amount of throttle (handle is actually rotated about 30 degrees because this is where the throttle starts working) *and* the choke turned on. Usually starts up after about 10 seconds of cranking.<br /><br />When warm, it will sometimes start immediately with no choke (but the same small amount of throttle). If it doesnt start after about 15 seconds, I switch to using the choke. If I cant start it in several attempts totalling 60 seconds or so of cranking time, I bring out the Starter spray and use that (lift the engine cover and spray into the air intake while cranking). If I dont do this, I run the risk of running the batteries down which would be a whole lot of hurt.<br />It usually starts then. I have also had the impression that, if anything, the engine was flooded.<br />Maybe twice a year, nothing seems to start it and I remove the plugs, which seem wet with gas (flooded?), and dry and replace. This invariably makes the engine restart.<br /><br />This occasional starting problem led me to add a 9.9 hp 4 stroke kicker to the boat, and that brings a lot of confidence with it.<br /><br />Note, for the starting fluid step, I had to add a switch by the engine to activate the starter (so I can crank while spraying). Just besure you turn off that switch once the engine starts... easy to overlook.<br /><br />Lastly, the single biggest factor in getting the engine to start is the health of the batteries. When the batteries are very strong and the engine really cranks quickly, it starts immediately. If it cranks at a more medium level, trouble is evident. On your boat, at home when you are having trouble starting, bring another battery over with jumper cables , find the plus and minus bolts on the starter, have someone turn the enging on and start cranking with the boat batteries, then connect the auxiliary battery and you may notice a big increase in the cranking rate... it will probably start. IF all this is the case, you may want to replace your starter batteries ( I didnt see that in your list of items you changed).<br />best regards,<br />paul
