Hi all,
I have a problem with my 1994 60hp yamaha FETO, it wont go beyond 4000rpm and its not a prop related issue.
I have this problem since day one but never noticed untill I had installed an RPM gauge.
If you open throttle to WOT it shoots out of the water (150kg boat and a 15pitch prop, should need a 21 pitcher normally) and directly stops reving up around 4000rpm, at this moment i have around 20% throttle left but that wont make a difference on rpm level.
What Ive checked and done so far:
-Checked compression on all 3 cyls, all seemed fairly good (need to check again if you guys want to hear exact pressure).
-Changed fuel pump and cleaned out fuel system and cleaned carbs (used carb cleaner and compressed air, cant be the issue)
-Changed all 3 spark plugs.
-Replaced CDI unit, bought used one from ebay but didnt make a difference.
-Checked ignition timing with timing light, idle at 7degrees ATDC, WOT 21/22 BTDC degrees according to manual found on the internet.
-Measured coils underneath the flywheel and the resistances all look normal according to manual I have.
What should I check next? I was thinking to replace the sparkplug cables just to make sure.. Also, can it have something to do with the ignition coils? Im quite clueless
what to do next..
Any help is much appreciated!
Thanks in advance!
I have a problem with my 1994 60hp yamaha FETO, it wont go beyond 4000rpm and its not a prop related issue.
I have this problem since day one but never noticed untill I had installed an RPM gauge.
If you open throttle to WOT it shoots out of the water (150kg boat and a 15pitch prop, should need a 21 pitcher normally) and directly stops reving up around 4000rpm, at this moment i have around 20% throttle left but that wont make a difference on rpm level.
What Ive checked and done so far:
-Checked compression on all 3 cyls, all seemed fairly good (need to check again if you guys want to hear exact pressure).
-Changed fuel pump and cleaned out fuel system and cleaned carbs (used carb cleaner and compressed air, cant be the issue)
-Changed all 3 spark plugs.
-Replaced CDI unit, bought used one from ebay but didnt make a difference.
-Checked ignition timing with timing light, idle at 7degrees ATDC, WOT 21/22 BTDC degrees according to manual found on the internet.
-Measured coils underneath the flywheel and the resistances all look normal according to manual I have.
What should I check next? I was thinking to replace the sparkplug cables just to make sure.. Also, can it have something to do with the ignition coils? Im quite clueless
what to do next..
Any help is much appreciated!
Thanks in advance!