90 HP Yamaha - Ethanol Woes - Page 2

RidgeRunner · #11 10-08-2010, 07:15 AM

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 · #12 10-08-2010, 06:38 PM

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 · #13 10-08-2010, 08:32 PM

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

RidgeRunner · #14 10-11-2010, 06:52 AM

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 · #15 10-19-2010, 11:54 AM

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 · #16 10-20-2010, 12:14 AM

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.

RidgeRunner · #17 10-20-2010, 08:04 AM

I agree with you about the Stabilizers NEMatters. I have yet to hear what ring free does. The owner of this 90 has sworn off any ethanol blended fuel, forever. I still added the ring free and stabilizer.
It went back together without any problems. The new fuel hose was not the Japanese brand and had a larger outside diameter. Getting it thru the rigging grommet turned into a mess. I had to reconfigure a couple times, very tight fit. Flushed the fuel pump, fuel cooler, cannister and replaced yet another filter. Cleaned the throttle body and it was very easy to reassemble. Put 5 gals in the new fuel tank found the water hose and it started right up. Idled right off the bat, silk I tell you. Fed it some throttle and it wrapped right up without hesitation. Sounded like a motorcycle. Owner will lake test this morning I ran out of daylight. Started at 6:15 PM and finished around 8:30. Lost time installing fuel tank and running fuel hose. It got the Racor water seperator with the clear bowl. Maybe he can see the problem before it gets too bad next time. Total cost in parts $650. Filters (total of 6 -the Racor was $50 and the one in the VST was $68), gear lube, oil & filter, plugs, impeller and fuel hose around $350. Fuel tank, injector service, ring free, stabilizer another $300. He didn't shell out any labor, I work for beer...

steplift20 · #18 10-24-2010, 09:21 AM

seafoam i have a 50 gallon tank how much should i put in and how offten, i all ways use startron will that go good with seafoam at the same time

Destroyer · #19 10-24-2010, 11:12 AM

Quote:

Originally Posted by steplift20

seafoam i have a 50 gallon tank how much should i put in and how often, i all ways use startron will that go good with seafoam at the same time

If you're running a 4 stroke engine, then use 1 oz per gal. of gas. If you're running a 2 stroke then use 2 oz per gal. of gas/oil mix.

I have no idea on the compatability of Starton and Seafoam since I only use Seafoam, but I would think there would be no problems. If you're hesitant, I'd run Seafoam one time, then Starton the next and alternate them.