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So I have heard that the Yamaha F350 has a drainage issue that can allow water to freeze in the head or block, I forget which. Yamaha does not (to the best of my knowledge) sell a supercharged outboard motor. Pretty sure you are referring to Mercury Verados which are supercharged. I have a...

How many people are trailering their 300 Express? We gotta stick together and help each other out :) Nothing better than what I posted above. You can see the livewell drain is sitting roughly over the center of the forward axle. I used Grady's published CG and some high school trig to...

The short answer is no, the cracks were not caused by freezing. The longer answer is: The boat is in the water at my dock year round. The starboard cylinder heads cracked on both motors, one just below the #1 cylinder's intake valve spring seat and the other just below the #3 cylinder's...

Trailer in action. My old motors, original 2004 F225's, had dry exhaust corrosion. Powerhead is hanging from a sturdy limb (not shown) while I replace the midsection.

Funny you should ask! I just launched my 330 last Thursday after a long time on the hard while I dealt with 2 cracked starboard cylinder heads on my Yamaha F300s. Story for another forum, search THT for that one. I have a triple axle service trailer for my 2004 330 express. I used Grady's...

ahh .. rear deck section removal might be the key. Then pull generator and its fuel tank. Thanks for the tip!

I have to ask, what are your physical dimensions? And does your grady have the diesel generator and fuel tank? I am about to attempt this and see no way to fit a body into the bilge.

Agree 100% that in my analysis, when I say "loss" and "friction" you can infer I mean conversion of mechanical energy into thermal energy. Lower units are well cooled, and after one season my lower unit oil is black. The difference bewteen car transmissions and lower units is the thrust...

why counter clockwise rotating props are less efficient I have done some more research and have what I believe is a credible explanation. 1. gearboxes or transmissions are "lossy" elements in a mechanical system. That's why, for example, engine HP measured at the crankshaft will always be...

S1000 experience I had a lightning strike on my boat which fried my simrad AC20 course computer. Since I already had the Simrad pump which could handle my steering rams I decided to try the S1000 on my 330 express even though its not advertised for use on boats over 25 feet. I used the...

For those of you with twin engines with the port engine counter rotating, do you see lower WOT RPMs on the port counter rotating engine? Anyone have an explanation for why, as a rule, this would happen?

Thanks, that helps explain what I am seeing as I am using E10. I am getting 5500/5700 RPM (port/stbd) and 40 MPH by GPS. My best MPG is 1.3 at about 4500 RPM. Do you get the same RPMs (ie 5700) on both port and stbd engines? I am getting 200-300 less RPMs on the port engine (counter...

update Since my last post on this topic I have had to get the horshoe filters replaced and have the VST tanks opened up to clean the filters on the inlet to the high pressure pumps. $700 for that work. I just finished rebuilding the fuel injectors since their filters were clogged. See...

keep your injectors clean I recently experienced a loss of RPM at WOT on my stbd engine coupled with an increase in fuel consumption. If any of you are interested in the cause, see my posts here with the explanantion. http://www.yamahaoutboardparts.com/foru ... #post43684 Moral of the...

Same here, 1.1 to 1.3 depending on trim and RPMs with 1.2 being typical for best trim+RPMs.

For the moment I have settled on running one engine from the main tank and one from the aux. I rely on my fuel management gauge to keep track of how much fuel I have burned and can then calculate how much I have left. Note that I have experimentally verified the accuracy of my fuel management...

I stopped by to check on the progress on my boat and chatted with the mechanic who confirmed what the service manager told me. He estimated that he works on 10-12 F225's a week and he has made 3 corrosion repairs total. Thats roughly a 1% failure rate. I manufacture electronics and a 1% field...

This is a common problem with Gradys that I have reported on here http://www.greatgrady.com/forum/viewtopic.php?t=8799&highlight= where you'll find a link to a readily available stainless replacement.

I dropped the boat off yesterday for service at Hilton Head Boat House. While I was there I asked the service manager how many engines they had repaired for corrosion of the exhaust manifold plate and it turns out that the owner's "alot" was actually 4 motors. They were all F225's. He believed...

I have a pair of 2004 F225's. This summer I found myself anchored next to the the owner of the local Grady White/Yamaha dealer and he happened to be in a trade-in he borrowed from the shop which also had a pair of F225's on it. We started chatting boats and motors and he is the one that...