[jeraljay]

I just had a newly rebuilt Yamaha excel 175hp installed on my chris craft. I bought the motor from a friend who is a boat broker and had a local mechanic install it. Since the mechanic didnt rebuild the motor he wont warranty the rebuild so i am trying to see if i can figure out the problem before dropping off the boat again and paying another hefty repair bill.

The engine idles fine and revs up to 4k no problem in neutral but whenever we put a full load on it it runs fine for 5-10 mins then the warning horn (constant) goes off and the engine dies out. The motor wont start for 5-10 mins then we can repeat the processes.

Originally i thought it was a fuel starvation issue, since the primer ball was collapsing whenever this happend. So i replaced all the fuel lines,filters, and vents. The tank is clean and there doesnt appear to be anything in the tank that could clog the pickup tube or filters, there is no antisiphon valve. Now the Primer call doesnt collapse but the engine still dies out in the same manner as before. I think i might have had multiple issues.

The motor is not hot to the touch and is peeing fine.

Ideas?

[rodbolt]

first idea is to post the complete model number.
second is to have the hull rigged with the yamaha digital tach.
3rd idea is there are no automtic shutdowns on the V yamaha motors so you may have n issue.
there are also no fuel restriction alarms either.
a picture,especially port and stbd sides,of this engine may help.
the EXCEL was built in about a 220HP version and only for a few years imported into the US. I dont recall a 175 EXCELL but memory on 20+ years ago fades .

something like 87-89 or so.
would not be the first time I have seen powerheads and frames swapped nor engine hood swaps.
thats why powerhead pictures are nice,we can positivly identify what ign/fuel system you have.
the EXCELL used a micro-processor CDI setup with a TPS and some other sensors.

[jeraljay]

ok i will get pictures tonight.

ANd i did have a new yamaha digital tach installed with the installation. The tach doesnt show any alarms or warnings when this happens

[jeraljay]

i tried to find as many markings as possible. if i didnt get the right number does anyone know where i should look?

[jeraljay]