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Thanks everyone again for the input. The first time around I soaked the things in carburetor cleaner, the second time around I "just" used a carburetor cleaner spray. I guess the compressed gas has...

Thank you two for the input, the problem is fixed now.

Spraying fuel into the air intake "fixed" the problem, which points of course to the carburetors.

We swapped them between the engines and...

You are of course right, there are no reed valves. I was just too used of having them after carburetors that I was dumb enough to not check the parts catalog properly.

I will try to spray some...

Hi everyone,

We have some trouble with our F100B (6OC X 1014050), which we have as a dual engine setup.

It will run absolutely perfect between idle and 2500 RPM, as well as 3500 – WOT, but...

They easily go above 2000 hours as Savage suggested.

I have two here with 5900, granted they are "only" 90 Optimax.

I retired four 250 Optimax a year ago, all of which had between 2400 and 3800...

My guess is while taking off the oil tank you have disconnected one of the grounds - a black wire that connect directly to the block. When putting everything back you may have forgotten to attach...

I'm fairly certain that the connectors you are talking about are coming from the Temperature sensor of the compressor and unplugging one will cause an alarm.

If it disappeared when plugged back in...

Did you try to fast idle the engine to just under 2000 RPM and then try the same thing? I remember having one engine where the miss on one cylinder was ever so slight that it was hard to notice in...

If you are certain that #6 is not firing I would suggest the following one by one:

Swapping of the spark plug with a known good cylinder.
Swapping of the coil with a known good cylinder....

Checked everything and I can blow air through the primer bulb right out of the vent hose of the VST.

This morning the problem disappeared on one of them magically. I will tear everything from the...

Hey Joe,

yes about half a meter of the line sits in sunlight. From the tank to the bulb its in the shade. I had these lines routed this way for the last 10 years without any issues - The lines...

Hello everyone,

I'm at a bit of a loss with our two Optimax 90 (1B802995 - 1B803159) and their primer bulbs.

If the engine sits for a while, say 10 minutes or so, I cannot pump fuel through the...

Thanks for the suggestion. Are there any connections which should not be connected with dielectric grease? I know that the relays shouldn't be coated in the grease, but was wondering if there are any...

I have a new harness coming in, but I just wanted to make sure that not a accessory like the fuel pump or coil or whatever could cause this.


The picture is of the first fuse box and I agree...

Hey,

finally managed to get some time on the boat this morning.

I have unplugged every coil and double checked the pins of the coils as well as the female part of the harness. There is no...

Interesting that you mention that, because this did happen a few month prior to the melting fuse. One of the grounds was loose and the coil got fried. I have re-checked all grounds back then and did...

I wont get to the boat today, so cant get pictures of the inside of the box.

If I'm not wrong the fuse that melted is the bottom left one, looking from the top onto the box, having the latch...

Good questions,

I will go and check out exactly which ones it protects once I got some time on my hands.

I know for sure the fuel pumps and please don't hold me to this, but if memory serves...

Hello everyone,


I need some help with our 250 Optimax (2B091968).


It is melting, what I believe to be the main power fuse. I unfortunately can't remember which fuse it was when looking down...

Hello everyone,

I have a problem with our Enduro 25 which I cannot figure out at all. (E25BMH 61RK L 1037162 G)

The engine will randomly destroy its spark plugs. When I say destroy, I do not...

Sorry it wont let me edit that post, but from what I have gathered before, these might not be serviceable and must be fully replaced which is so counterintuitive to me.

I can understand that if...

Hello there,

The trim assist on our Mariner 75 (1B489519) is not working anymore. It doesn't matter if the little lever on the side is switched to the lock or unlock position, the engine will drop...

Zanzibar, on the east coast of Tanzania, Africa.

Parts take a general 6 month to get here, it is absolutely insane. There is one supplier and he doesn't give a crap about customer service. I wish...

So, just a quick follow up.

The problem ended up being the outlet on the block.

I took the lower cowl off and followed the small gray tubing to where it ends up in the block. A number 11...

So i swapped the sensor out and so far the problem has not occured again, which might also be a coincidence.

What surprises me is that no matter which sensor i plug in (And I tried 3 different...