*THE HULL TRUTH is the world's largest FREE network for the discussion of Boating & Fishing. Whether you're researching a new boat, or are a seasoned Captain, you'll find The Hull Truth Boating & Fishing Message Forum contains a wealth of information from Boaters and Sportfishermen around the world.
Welcome to the updated THT!
If you are having trouble signing in, please email feedback@thehulltruth.com with your username and we will help you. We thank you for your patience as we help you access the new site!
Random Quote: How did those footprints get on the ceiling in the head ?
I have twin 225 optis on a 2895 triton. Coming back in from the stream last week ,running @ 4000 rpms the port motor started surging from 3000 to 4000 rpms under load when I would hit a swell. I tried to accelerate during the surging and the motor would not respond. I checked the fuel filter under the cowl abd this appears to be ok. This boat has another fuel filter/water separator mounted in the transom @ the primer bulbs. Should this setup have two filter/separators per motor like this or could they cause restriction in the fuel system? Any more opinions on this problem would be appreciated. thanks, stuman
If I had water wouldn't I get an alarm on the smartcraft gauges. I checked the engine mounted separator/filter and maybe got a nickle sized spot of water out.
You haven't changed props lately have you?...what is your wot rpm?..An overpitched prop can drive a di 2 stroke nuts....probably 4S too for that matter...., surging is one of the side affects.
If I had water wouldn't I get an alarm on the smartcraft gauges. I checked the engine mounted separator/filter and maybe got a nickle sized spot of water out.
Oh wait a minute, you are not supposed to use another set of water sep's in addition to the factory ones on the motors. The dealer recommended I remove them when I was repowering, so I did. I know this does not help your present problem though unless you have a restriction causing flow problems.
The only other thing I can think of right now is maybe a spark plug boot on the hairy edge of popping off. One of my old Suzies used to do that once in a while.
Merc has revised their stance on in line filters. If they are installed wrong, no warranty. if they are instaled per the vacumn draw spec in the shop manual they are fine. The verado manual also recommends in line filters if ethanol is to be used. this hold for optis also. I received this from Merc corporate a few months ago when I asked this specific question....and yes min fuel line is 3/8...the direct email comment:
"The key is "properly installed". If any engine failure results from the installation of a Racor filter, we will void the warranty. A simple test to confirm if the filter is adding too much restriction is to install a vacuum gauge and measure the fuel system vacuum. The acceptable values for various elevations are listed in the Service Manual."
Merc says not to have twin fuel filter set up,but I have it.What size fuel lines feeds from the tank?Hope no less then 3/8"ID.Did you check for water or trash in the first inline filter?How about water cooling?Any temp problems?My port motor did the same,even with a good water flow from the tell tale.Thats no good.All that tells is that you have water flow thru the air compressor.Come to find out that the popit valve dirpham had busted,dumping water out the side,inside the motor cowl.Just didn't look right,Do pull the cover and look for water stains inside.If so,clean and spray down with salt a way or something on that line.Popit valve dirpham cost $4.50 and 15 mins to change out!
Don't check the filter, change it. Change every other fuel filter on the motor, too. Surging is a fuel problem, water or starvation. Fuel starvation in a 2-stroke is a very bad thing. Check every fitting in the fuel system from the tank to the engine for possible air leaks.
On my 2005 225 Opti, I had the dealer install that same F/W seperator. At first it was running fine then it started surging and bogging down. I found that if I opened the fuel drain on the filter, it would releive some pressure some how, and my engine would run fine. I eventually removed the F/W seperator and listened to the manufactures reccomendations. No additional seperator, no more problems.
Merc has revised their stance on in line filters. If they are installed wrong, no warranty. if they are instaled per the vacumn draw spec in the shop manual they are fine. The verado manual also recommends in line filters if ethanol is to be used. this hold for optis also. I received this from Merc corporate a few months ago when I asked this specific question....and yes min fuel line is 3/8...the direct email comment:
"The key is "properly installed". If any engine failure results from the installation of a Racor filter, we will void the warranty. A simple test to confirm if the filter is adding too much restriction is to install a vacuum gauge and measure the fuel system vacuum. The acceptable values for various elevations are listed in the Service Manual."
Glen this raised my curiosity. What happens if a merc authorized dealer improperly installs an in-line that leads to failure? And don't tell me it can't happen. If 20% of what we read about some dealers on this site is true....you know it can happen.
Merc has revised their stance on in line filters. If they are installed wrong, no warranty. if they are instaled per the vacumn draw spec in the shop manual they are fine. The verado manual also recommends in line filters if ethanol is to be used. this hold for optis also. I received this from Merc corporate a few months ago when I asked this specific question....and yes min fuel line is 3/8...the direct email comment:
"The key is "properly installed". If any engine failure results from the installation of a Racor filter, we will void the warranty. A simple test to confirm if the filter is adding too much restriction is to install a vacuum gauge and measure the fuel system vacuum. The acceptable values for various elevations are listed in the Service Manual."
Glen this raised my curiosity. What happens if a merc authorized dealer improperly installs an in-line that leads to failure? And don't tell me it can't happen. If 20% of what we read about some dealers on this site is true....you know it can happen.
dunno ...if a dealer installed it and it was not correct, I assume the liabiltiy would be with the dealer and merc would counsel him thru the field rep...
SURGING 225 OPTIMAX 
