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How many hours and what is the compression in each cylinder?

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check that the 2 fittings which the water dump hoses go into at the bottom above the midsection aren’t corroded, both of mine were 3 years ago and led to a similar situation which would...

That’s very helpful Don, I really appreciate the insight - thank you!

Just a quick update for anyone interested in the future. Per my mechanic’s recommendation I “overdosed” the fuel with Quickleen (4x standard amount). After 25 hours and about 60 gallons of fuel it...

Thanks Don, for all of your help. I ordered a new Suzuki DF250AP that should arrive in a month. Mercury’s lead time was 57+ weeks and I didn’t want ongoing issues to eat into next season. I’ve run...

Sorry to hear, I’m unfortunately dealing with the same thing so I don’t have anything to suggest other than to ask if you had the 3 diaphragms on your fuel rails inspected/replaced?

Any recommended alternative options in that case?

I wish I read your post this morning Don before I put it back in the water per my Mechanic’s recommendation. Things are definitely still not right with the same idle problem in the water....

Serial # 0T385093

Would a bad direct air injector or broken reeds cause such a bad surge at idle speeds? All 3 fuel/air diaphragms, properly gapped plugs and port fuel injectors/rail are brand new. Seems my issues are...

Thank you for the response Don. I didn’t remove the intake yet to check the reeds as I don’t have the gaskets in hand and wasn’t sure if they would cause this problem that’s most prominent at idle...

At the point where I think I need to replace mine and want to continue using same rigging with VDO Early Smartcraft Gauges.

Engine serial # 0T385093

My engine is running very rough at idle, jumping up to 300rpm down/up. Took it to a Merc shop to have a no start situation fixed and that ended up being the crank position...

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Thank you very much Savage and Don, I can’t express enough how much I appreciate your help and sorry for the lengthy initial post. I tried swapping the main power relay with no luck. When I checked...

1. Engine Serial Number: 0T385093
2. Year/Make/Model: 2001/Mercury/Optimax
3. Prop you are Running: 17P MIRAGE Plus 15.5’
4. Current Maximum RPM: 5,750 RPM (theoretically and only if throttle...

Where is the cannon plug located, does it go to the ECU?

Thank you Don, I really appreciate the advice and will try to test per your suggestion but it may take a while. For some reason it doesn’t seem like a fueling issue with everything to the pulse fuel...

1. Engine Serial Number: 0T385093
2. Year/Make/Model: 2001 Mercury 225 Optimax
3. Prop you are Running: 17P MIRAGE Plus 15.5”
4. Current Maximum RPM: 5,750 (technically)
5. Idle and WOT Water...

ENGINE SERIAL # 0T385093
I can’t for the life of me find the 2nd Inline oil filter On my 2001 225 optimax. I got the one on the port side at the top right under the top cover just fine (seen in...

I had a similar issue last year (salt water 2001 225 optimax) and traced it down to a brass fitting that goes down to the exhaust adapter plate being completely corroded and breaking off. It was at...

I can’t for the life of me find the 2nd Inline oil filter On my 2001 225 optimax. I got the one on the port side at the top right under the top cover just fine (seen in bottom right of this oddly...