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Author Topic:   Sluggish 200 merc optimax
mjfpilot posted 08-01-2003 11:20 AM ET (US)   Profile for mjfpilot   Send Email to mjfpilot  
Just got my boat back from its annual checkup about 3 months ago. All new plugs,new air injector, and fuel drained/strained due to water in fuel filter...Costs about 800.00 dollars.(99 boston whaler optimax/99 merc opti) Ran good when I got it back but havent run it much since. Took it out the other day..runs smoothly but with a substantial loss of power. It takes forever to get up on plane. With full throttle only getting 3000rpm until it gets on plane and then 4400rpm. Speed topping out at 30 knots...used to get in the mid-40s. Could it be the carb and if so can a fuel additive be used on a 2-stroke? Any help would be appreciated.
Lars Simonsen posted 08-01-2003 12:01 PM ET (US)     Profile for Lars Simonsen  Send Email to Lars Simonsen     
The optimax doesn't have a carb. I wouldn't use any carb cleaner on it. Bring it back to the shop.
lhg posted 08-01-2003 04:14 PM ET (US)     Profile for lhg    
$800 for an annual checkup sounds stiff to me. I haven't spent that much on my 200 EFI's in 6 years and 1400 hours.

I'd bring it back and tell them to fix what they screwed up,
for free.

Do Optimax's REALLY require this kind of high priced check-up service?

If so, I don't think I want one!

Or is the dealer the problem?

mjfpilot posted 08-01-2003 06:23 PM ET (US)     Profile for mjfpilot  Send Email to mjfpilot     
Yeh, about every 100 hours requires lower unit and spark plugs. The plugs alone cost about $25 each. I've had nothing but problems with this engine. Bought it used with about 100 hrs on it. Also, had to put a new starter in it already...I'll never buy a mercury again.
dauntlass 18 posted 08-01-2003 08:22 PM ET (US)     Profile for dauntlass 18  Send Email to dauntlass 18     
By lower unit do you mean change the lube.oil in lower unit?I have owned two Optimax engines my experience with NGK plugs is they will last much longer than 100 hr.Do a search on plugs you will find mail order houses selling NGK platium plugs for about 11.00 dollars each.I can r&r a set of plugs and sand blast, clean them in less than a hour.At present time I own a 200hp Optimax.
Fishcop posted 08-01-2003 10:04 PM ET (US)     Profile for Fishcop  Send Email to Fishcop     

No carb on an Optimax.

Loss of power is usually an air injector or bad plug.
If you had an air injector replaced, you must have been in the same situation you are in now prior to the tune up, loss of power.
Which air injector did they replace? Check that cylinder to see if it is being used.

If you have new plugs, pull each one and check to see which one is not being used. That will tell you if all are firing.
The Optimax motors are very strong and will run on less than all cylinders.

What did they do to drain/strain your fuel?
You have a fuel/water seperator on your motor that keeps water from getting into your engine. A simple five minute job of checking the filter and dumping any contaminated fuel is all that is required.

The lower unit requires oil changes that you can do yourself. Cost of oil is about $5 and ten minutes time.

If you really are having problems with the motor after a service, take it back and have them fix the problems.


The air injectors are over $200 each. Labor in CA is around $70 to $85 and hour. Plugs are more expensive than the EFI's. You can get them for less online.
Also, all Optimax motors have an ECM that indicates fault codes. Theses fault codes will tell the mechanic what went wrong and when it went wrong. No guessing with with the Optimax.

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