90 HP Yamaha - Ethanol Woes

[spareparts]

if thats a 90 EFI Yamaha 4 stroke, then pull the intake off, its not as hard as you think, the bottom bolt is tricky. Take the throttle bodies with it. leave the VST attached to the intake. Once you have the manifold/VST assembly on the table, you can pull the screws out of the top of the vst and drop the resevoir off the bottom. Clean out the resevoir, replace the screen on the fuel pump. Take the injectors out, send them off to have them cleaned(I use injector rx), when you put it all back together, fush the mechanical fuel pump with carb cleaner, then gas. Replace the inline filter between the mechanical pump and the VST. Put it all back together, repalce the fuel line with new, install a water sep filter if you don't allready have one. I've done about 10 of these this year. I've tried every short cut, but its easier int he long run to pull it all apart and do it all at one time

[RidgeRunner]

Spare, that is what I have been waiting for, a definative answer to the looming question. I didn't know if the screen in the VST was servicable or not. The entire fuel system is clean/new all the way to the pump. It has a water seperator, new tank, new filters, new fuel lines and primer ball. The mechanical pump has not been touched other than to run clean fuel thru it. My local Yamaha shop is now cleaning injectors for $45 ea. I planned on sending them off to Brucato but it would be convenient not to have to. What do you think? The fuel system is nearly identical to the one on the 250 Merc EFI. I don't know why I would treat the Yamaha differently, looking for a shortcut I guess. Thanks again for your input.

Reel, not yet on your baby. Still in the planning and funds development stage.

[spareparts]

the mechanical pump can hold a bit of trash, I ususally spray some power tune thru it and let it sit, them flush it with fresh gas. Injector RX charges $18 per injector, they have a quick turn around, but shipping takes a while, usually about 10 days from the time I ship them till I get them back. Ask the shop how they clean the injectors, if they install new screens and do they perform a flow test when done(Injector RX does). Some of the local shops around here say they clean injectors, they put them in an ultrasonic cleaner and spray carb cleaner thru them. Not the way to do it my opinion.

[macojoe]

Just wait!! I hear there is a push for E35 and you think E10 is bad!!

[RidgeRunner]

Took the injectors out. It took about a minute. The intake was also a snap. VST was very dirty inside, black deposits of crud on the bottom of the can. Screen type filter was a mess. Buying a new filter and sending the injectors off. Yamaha shop told me that there were no screens avail. for these injectors??? Same guys that want to clean the injectors by backflushing in an ultrasonic bath, I do not believe they have before and after flow rates like RX or Brucato.. Thanks again for the tips.

[RidgeRunner]

It has been a week and now it is ready to go back together. Pro Flow in New Port Richey, FL did the injectors and they tested flow rates and spray patterns before and after. One injector improved 38%. That is what I was hoping for. The VST is ready to go back on. Once the fuel dried up in the VST I was amazed at the grit that came out of there. When the filter dried it was very clear that it needed to be changed. Wish me luck, it goes back together this evening...

[NOTHING ELSE MATTERS]

Guys, try to use ring free AND Startron on EVERY fill up, i've been doing it now for lots of years(we have ethanol up here for good 5-6 years) and never had a problem(knock on wood). I don't work for Yamaha or Startron (i've been accused for that before), but do your self a favor and do that religiously.