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'98 Yamaha 200 SWS II not been run for months. Did not drain fuel. Had stabil in tank. I just looked in each carb via drain bolt and most were empty, some had small amount of oily mix drip out.

Did I screw up? Can I run engine or do I need to clean out varnish, etc. in carbs? How do I do this? Any tips? Can I safely run engine with water hose attachment on port side? How long? Thanks.

If you had stabil in the tank, you might be alright. Gas turns into a varnish like crude when it evaporates. That crude clogs jets and keeps boat mechanics in business. It should not hurt to try and crank it on the hose. I've been told that it is better to use the hold clamp on water source than the built in hose on Yammies.

I've been told you should NEVER run an engine on the hose attachment, it's only for flushing with the engine off.....it does not supply water to the pump!!! Check your owners manual.

I always use the muffs on mine.

It wouldn't hurt to add the appropriate amount of Sea Foam to the tank to help clean out the carbs and condition the fuel.

Like MD said won't hurt to try and crank. If you get it cranked let it run awhile. They longer it runs the better, the gas flow will help clean it out. Could save you a repair bill.

Pump the carbs full of fuel and drain them a couple times before cranking, this will help clean the bowl out ALWAYS use ear muff type flusher when running, the hose attachment is for flushing the motor without running it

wevans wrote:the hose attachment is for flushing the motor without running it

Not on a Merc, you can run at idle on the hose attachment.

Fish Masterson wrote:It wouldn't hurt to add the appropriate amount of Sea Foam to the tank to help clean out the carbs and condition the fuel.

What's Sea Foam? If it is a new gas tank crud cleaner, if I don't need it now, I will for the next old rototiller or outboard I get.

Tom-

You're screwed. I'll come by and pick remove the old motor for free and dispose of it properly. Just PM me

KarstRanger, Sea Foam has been around for awhile, and alot of people swear by it. They sell it at most auto parts stores. It is supposed to stabilize and condition fuel, as well as help remove water, and clean the carbs.