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[The fuel tanks which are the topic of this discussion are made from] aluminum.

I have found information about a new gasket.

I have not found information about a new fuel tank cap.

ASIDE: the engine is a 1989 Johnson 90-HP two-stroke-power-cycle model with automatic fuel-oil mixing.

Figure 2 below shows the fuel tanks I am asking about.

When I purchased the boat the tanks were included , they are similar to mercury metal tank twist-on caps but 12 gallon not 6 , I understand that they were original equipment on some of the Montaulk’s in the 80’s. I don’t have a picture because it’s covered until the spring.

Q1: where can I purchase a replacement, metal, twist-on gas cap for a 12-gallon, metal, on-deck fuel tank that was original equipment used on my 1988 Montauk 17?

I had the [1989 Johnson 90-HP engine] serviced by [Lockeman's Hardware and Boat] in Detroit. They believed the old [fuel hose] connection fittings were leaking fuel, and the [fuel hose] connection at the engine was a cause of the smoke. I was told my problem was most likely an air leak problem, so I...

The outcome: the cause of the problem with the 1989 Johnson 90-HP engine having smoke in the exhaust was found to be the fuel line had an air leak. The remedy included: ⋅ replacing eight-feet of fuel hose; ⋅ changing the fuel can spout; ⋅ changing the fuel intake connec...

Thank you, My plan is to leave it 1/2 full and add MDR Store & Start to the fuel,, for reference MDR Store & Start is the only additive I have used that left the fuel looking clear after winter layup in Michigan on my Carver with twin 140 gallon tanks,

Q1: among these methods of storing a 12-gallon on-deck fuel tank for the winter, which is recommended: ⋅ empty of fuel; ⋅ filled to full with stabilized fuel, or ⋅ left at some intermediate random level as exists at end of season with stabilizer added? I have always add...

I looked up the XD100 oil. [Some unidentified resource] shows XD100 oil is for an E-TEC engine.

My 1989 two-stroke-power-cycle engine is not an E-TEC engine. The manual recommends SAE oil

I just want to make sure [XD100 oil] is compatible.

I have been using the Quicksilver oil for several years and this is the first time the motor has had this smoking [behavior] at idle. The smoke seems to be white. [Unspecified advice obtained from the internet] suggests [the cause of white smoke in the exhaust] could be ⋅ water in the fuel...

My Johnson [1989 90-HP engine with variable ratio oil system or] VRO always smoked when I started it, I was told [the cause of smoke in the exhaust on initial start-up of the 1989 Johnson 90=HP engine with the VRO system was because] the [spark] plugs had excess oil on them [due to some behavior onl...

The [socket with universal joint linked above] looks like it will work. I have one on order from Amazon. The size and angle are correct.

Thanks for replies,

Give advice on how to replace the spark plug in cylinder number four (the lowest cylinder) on a 2019 Mercury 115 FOURSTROKE engine. Q1: is there a special special tool or a special procedure to replace the spark plug on cylinder number for (the lowest cylinder) on a 2109 Mercury 115-HP FOURSTROKE en...

Q1: what product can remove the damage to the finish of the black Mercury outboard engine caused by the use of aluminum cleaner-brightner? I have already tried cleaners, and I have tried rubbing out the finish of the black Mercury outboard engine, but so far nothing has worked. BACKSTORY I over-spra...

Jim, and everyone else that replied thanks for all the info, I will get the prop dia and pitch next time I get in the water, the boat stays in the hoist so the only way to see the prop to get in the water.

An 1985 OMC 90-HP engine with VRO (J90TLCUR) has a fuel filter 0397715 which is a discontinued part.

This fuel filter looks like it can be taken apart and cleaned.

Q1: what is the right method to clean a fuel filter of part number 0397715 without damage?

I changed the spark plugs. I changed the the gear case lubricant. I added oil to the the VRO tank to FULL; the tank was at 1/2-FULL. Then I got the boat underway and ran the engine at a high speed for 20-minutes. The engine trim was set down. The engine ran without making the knocking sound heard be...

To measure boat speed I used a smartphone with a GPS speed app.

To answer a few questions: I believe the prop is 13x15, but will I check the pitch when I can get in the water to look. The knocking noise was similar to a diesel engine when it first starts up. The sound was not a swishing sound. I believe the VRO is working. I believe when I trimmed the engine up ...

I looked at my receipt from the rebuilder: the engine was rebuilt in 2009. The VRO was not changed, but a new filter and alarm system was installed. I did notice was the primer bulb is solid and will not squeeze. Q13: is [the reason the primer bulb will not squeeze] because it is fully primed? Q14: ...

All the replies were helpful. To answer a few questions: --the VRO was rebuilt at the time the engine was rebuil --the noise or knocking sounded like a Diesel engine starting but stopped as soon as the engine came back to a lower speed --I ran the engine again for about five minutes at a high speed ...

Q5: does the engine have a tachometer gauge connected to it? There is no [tachometer]. I assume the engine [speed] was in excess of 7,000-RPM due to the engine being trimmed up. To get the speed to 50-MPH took a while. This engine was rebuilt in [2007]. Since 2007 I estimate the engine has about 20...

On July 31, 2022 I ran my Montauk 17 with a 1986 Johnson 90 HP VRO at full throttle with the engine trimmed up to see what boat speed could be obtained: the boat accelerated to over 50-MPH. Then after a few minutes I could hear a knocking in the engine, I slowed down and within five seconds the nois...

I have tried to find a auto body shop but they either don’t want to bother or it’s just over the top expensive. I thought I may be able to find someone that could do the job a a reasonable cost. I can most likely do it myself but the decals are oem and I will get one shot and don’t want to mess it u...

What is the name of a shop in southeastern Michigan that repairs outboard engine cowlings at a fair price? A 1998 Johnson 90-HP outboard engine cowling has a small nick, needs to be repainted, and needs new decals applied. I already have the decals. I would like to bring back the the engine to its o...

The tanks are 12-gallon metal factory-supplied, the hose has quick connects on each end, and the hose goes below the deck through the tunnel and connects to the motor. The primer bulb is just outside the tunnel in the middle of the tanks under the seat. I was assuming a fuel line kit that fits a Joh...

I am in Michigan. I need a small crack [in the engine cowling from a] 1988 Johnson 90 VRO fixed, the cowling repainted, and the decals (which I already have] applied. So far I have only found one shop willing to do the job. They quoted $350 to $400 to do the work, and that cost seemed a little high....

I need a replacement gasoline hose assembly for my 1988 Montauk with the original 1988 Johnson 90 engine and the original 12-gallon metal tanks. Q1: What size [rubber hose] do I need? Q2: Where is the best place to order [a replacement gasoline hose assembly]? Q3: Are there any complications to repl...