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Changed plugs out today after I did a little carb work on my proV 150 and for the first 10 min it hauled a$$. After a bit it seems to load up and I lose about 500 rpms and my hole shot becomes a bit weak. Afterward I checked my plugs and (as usual) the plugs come out oily and wet. Is this a problem with fuel/air mixture? Anybody seen this before? How to fix this or is this normal?.....Thanks.
Yeah I would say it defiently sounds like you are running very rich. I'm not real familar with the yamahas but you should be able to make some adjustments on the carbs.
I have the same motor on my ranger and have had the same problem. I took it to the shop and there is an adjustment for the oiler, I WOULD NOT TOUCH THIS but have a mech look at it, they adjusted mine and it was good after that. another piece of the puzzle was that the prop was to much for the motor and boat, that caused fouling of the plugs because I was bogging it down. dumping all that fuel that could not burn due to the engine not reving up like it should. its like trying to drive in to high of a gear going up hill. I am running a 23p four blade and it has made a world of differance in performance. I was running a yamaha 25m.
you have a real nice ranger by the way.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ultramag »</TD></TR><TR><TD CLASS="quote">I have the same motor on my ranger and have had the same problem. I took it to the shop and there is an adjustment for the oiler, I WOULD NOT TOUCH THIS but have a mech look at it, they adjusted mine and it was good after that. another piece of the puzzle was that the prop was to much for the motor and boat, that caused fouling of the plugs because I was bogging it down. dumping all that fuel that could not burn due to the engine not reving up like it should. its like trying to drive in to high of a gear going up hill. I am running a 23p four blade and it has made a world of differance in performance. I was running a yamaha 25m.
you have a real nice ranger by the way.</TD></TR></TABLE>
Yep, I used to run a 25m also but changed to a 23p Trophy for the same reason. I think before I mess with the oiler I'm gonna pull that carb back off and replace the one float and float valve that didn't operate as smooth as the other. I looked inside the cylinder that runs off that side of that carb and it was the only one that had oily carbon build up. The other five cylinders looked good. And I think it is probably more than a coincidence that after I pulled that carb apart and cleaned it, it ran great for the first 10-15 minutes. I'm hoping that once I get that cylinder running fine it won't bog down so much coming out of the hole and maybe won't foul the plugs quite as much. We'll see what happens as soon as my parts show up. http://www.bassboatcentral.com/smileys/praying.gif
Thanks for the compliment on the boat. I bought it back in the spring from the original owner for $5K. The hulls got some scratches and it is a bit faded on the water line but the motor supposedly has low hours and has ran like a scalded cat until just recently. I couldn't be happier with it. http://xs-s.com/zf/images/smile/emthup.gif
Either your getting to much fuel, spark plug, or you have a coil breaking down on you when it gets warmed up.
My guess is fuel mixture or float level, check to see how many turns your idle mixture screw is turned out, I usually start at about 1 and 1/4 turns or until it starts idling well then turn it out until it starts idling badly then adjust in between those two settings. If it is sneezing or popping you have it too lean.
Cleaned that carb again and it ran great for a little longer this time before it lost power. I guess I'm just gonna have to keep cleaning it out until I work all this crud through the system. Might even go ahead and swap out the fuel/water seperator and see if there's any junk in it. The filter on the motor looks ok and the fuel lines are clean on the inside. I swapped the coil to another cylinder just to be sure that wasn't the problem(and it wasn't) Hey, if nothing else, I've at least learned how to tear apart my carburetors without the assistance of a $85/hour mechanic. http://www.bassboatcentral.com/smileys/Laugh.gif