I had a similar problem a while back with a 30 HP Yamaha. The timing
advance was not working properly......

Good luck, FIN


"Grant" wrote in message
ups.com...
Hello,

with a 2004 70 HP Yamaha outboard................. I then accelerated up to
around 40K RPM and it did fine. I slowed back down to around 14K RPM for
around 10 minutes and then when I tried to accelerate the RPMs actually
decreased as I tried to give it more gas to the point where the engine would
stall if I gave it too much. If I backed off the accelerator it would
return to around 14K RPM.............. noticed that the RPMs seemed to be
increasing......... as a test tried to accelerate again and sure enough the
problem was back............

Thanks!

Grant Schenck