Personal Water Craft Forum banner
1 - 13 of 13 Posts

·
Registered
Joined
·
6 Posts
Discussion Starter · #1 ·
I have a 2003 Yamaha FX140. Originally starting missing and now only goes as fast as 12mph. Starts fine and runs fairly good. I changed spark plugs, impeller, and air filter. Any other suggestions, fuel issue?
 

·
Registered
Joined
·
6 Posts
Discussion Starter · #8 ·
When I went run it yesterday it ran about 22 miles per hour and it was running about 6000 to 6200 rpms. When i would put it in revervse I could rev it up to 11000 rpms. What was odd was when I first went out to run it I could only get about 5000 rpms and 12 miles per hour and then all of a sudden it gained alittle more power and I was able to get up to 22 mph. It is running on all 4 cylinders just get get that speed in fwd.
 

·
Registered
Joined
·
6 Posts
Discussion Starter · #9 ·
Confused...
When I went run it yesterday it ran about 22 miles per hour and it was running about 6000 to 6200 rpms. When i would put it in revervse I could rev it up to 11000 rpms. What was odd was when I first went out to run it I could only get about 5000 rpms and 12 miles per hour and then all of a sudden it gained alittle more power and I was able to get up to 22 mph. It is running on all 4 cylinders just can't get that full forward speed.
Any suggestions or ideas???
 

·
Registered
Joined
·
323 Posts
This is a weird one. These yamaha 4 strokes usually only need the plugs changed. Its usually the only thing that happens to them. But you have already changed them. If it revs to 11000 in reverse i would'nt think it is electrical. Possibly the fuel pressure is down. You should check this. Also, sometimes the valve seats get a slight bit of surface rust causing them not to seal. This would happen due to condensation.
 
1 - 13 of 13 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top