I have twin yamaha F225. One motor runs great. The other runs and sounds fine until it hit 4200 RPMs. Then I push it over this, the power drops to 3600 and goes up and down. It always happens at 4200 RPMs. Any ideas?
J-16 Carolina Skiff
What year is the F225:question:http://www.24-7pressrelease.com/press-release/yamaha-f225-outboard-engine-experiences-severe-corrosion-problems-366221.php
2002
J-16 Carolina Skiff
That was the year they had the problems with! Get the motor checked for the corrosion issue, if you havn’t already done so!
Just went through the same thing on my f250’s, change all fuel filters, 3 on the motor; 1 in the front, 1 on top of the vst and 1 on the high speed pump inside the vst housing, and external if you have one, and hope this fixes it and it is not the high pressure fuel pump
SEMPER FI
30 gw marlin
35 donzi sfc (sold)
25 pursuit cc(sold)
45 egg harbor sportfish (sank hurricane)
I doubt its corrosion…even though I am familiar with it after reading about it all over the internet. Sounds like a fuel pump to me. Vapor Separator Tank has a screen filter in it that might be clogged too.
For what its worth…sometimes we learn from other’s experience…but I had a problem last weekend with my 03 F3225 Yamaha after making long runs on the lake…and cranking back up later after fishing…it wouldn’t take gas and would shut down. The motor was sucking air. After priming the fuel with the bulb, it would go. At speed, there were no issues, it was only when starting off.
Also, I’ve noticed lately it would only run about 4800 RPMS at full speed…I started with the cheaper fixes before moving to the VST on the motor(hoping I wouldn’t have to)…I swapped out the primer bulb (sometimes the check valves go bad), I put a new fuel water separator and assembly on and I changed the fuel tank piece that fits down in the fuel tank for lack of a better description (and has a new fuel line pickup). Also put on a new anti siphon valve at the fitting. tightened up all clamps…Ran it last night…ran like a champ and I was getting 5500 RPMS from the motor. It’s never run over 5200 RPMS since I bought it. Amazing what better fuel flow will do. Make sure your primer bulb is facing north/south with the arrow going straight up too. If you have to, zip tie that sucker to keep it north/south. Everything I did above was simple work so I did this myself.
Fuel flow solved, I am still dealing with a temp alarm issue at idle though. I noticed the motor was running at only 400RPMs at idle and it should be running at 6-700. I’ve already changed thermostats, poppet valve and impeller. It’s at the shop right now getting checked out since this has me baffled and I feel like I can’t fix this myself. Probably going to take someone who can read codes and figure this out. I’m thinking it’s going to take a full water pump kit instead of just a new impeller. They’re going to adjust the idle on the mo
For the record…just got the verdict in on my overheating issue…the bowl the impeller sits in is melted in spots…needs a complete kit with new gaskets and seals. Hopefully my alarm will stop going off now. Much better news than corrosion.
Billy
USCG Licensed Captain
—Team Pitt Crew–
Sailfish 236CC
F225 Yamaha
quote:
Originally posted by Billfish OBXFor the record…just got the verdict in on my overheating issue…the bowl the impeller sits in is melted in spots…needs a complete kit with new gaskets and seals. Hopefully my alarm will stop going off now. Much better news than corrosion.
Billy
USCG Licensed Captain
—Team Pitt Crew–
Sailfish 236CC
F225 Yamaha
Hey guys…This is what a melted water pump bowl looks like…I ran it on ears once several months ago (a mechanic said I could…guess he meant very briefly) but these motors need to be totally submerged…they are not self priming. Lesson learned. I would say the water tube is maybe 20% open? No wonder it was running hot at idle! This is the kind of mistake you make once and don’t do it again.
Billy
USCG Licensed Captain
—Team Pitt Crew–
Sailfish 236CC
F225 Yamaha
EASY
that symptom has nothing to do with the corrosion in the adapter plate. that causes a low rpm overheat
BOYSCOUT
the issue you are having is most likely a fuel supply problem. its probably the horseshoe filter on the back of the VST
BILLFISH
if you are idling at 400 rpms, you other problems besides a bad waterpump
those motors will run on the hose attachments the water pressure “primes” the pump
quote:
Originally posted by chris VEASY
that symptom has nothing to do with the corrosion in the adapter plate. that causes a low rpm overheat
BOYSCOUT
the issue you are having is most likely a fuel supply problem. its probably the horseshoe filter on the back of the VST
BILLFISH
if you are idling at 400 rpms, you other problems besides a bad waterpump
those motors will run on the hose attachments the water pressure “primes” the pumpwww.teamcharlestonmarine.com
www.joinrfa.org
New water pump kit put in today and adjusted idle to 600rpm. Runs like a champ now - best it’s run since I bought it. Tested for a couple hours this afternoon. Glad it’s right again.
Billy
USCG Licensed Captain
—Team Pitt Crew–
Sailfish 236CC
F225 Yamaha
quote:
New water pump kit put in today and adjusted idle to 600rpm. Runs like a champ now - best it's run since I bought it. Tested for a couple hours this afternoon. Glad it's right again.Billy
USCG Licensed Captain
—Team Pitt Crew–
Sailfish 236CC
F225 Yamaha
something is wrong somewhere if you had to have the idle adjusted.