2hp Johnson for intex mariner 4

[mrdrh99]

So.... I know I won't be getting on a plane in my mariner 4 but how fast could I expect to go with a 2hp? I'm currently using a 30lb trolling motor and I want to double my 3mph tips with that. I'm picking the outboard up today provided that it runs well in the test.

 

[mrdrh99]

Re: 2hp Johnson for intex mariner 4

So I got the motor! It was 16?outside but we filled the tub with water and it fired up in 3 pulls. I do wish it had the throttled handle but I got an awesome deal on it and I think it'll serve me much better than just my 30# kota.

 

[Guest]

Re: 2hp Johnson for intex mariner 4

So I got the motor! It was 16?outside but we filled the tub with water and it fired up in 3 pulls. I do wish it had the throttled handle but I got an awesome deal on it and I think it'll serve me much better than just my 30# kota.

Just because use it starts doesn't mean it will run, you needed to check fwd gear before you bought it. I got burned that way

 

[mrdrh99]

Re: 2hp Johnson for intex mariner 4

It only runs in forward gear.... You have to turn it backwards to go in reverse... We ran it for about 5 min in a 50gal barrel throttling up and down, in and out of neutral. He put lots of new parts in. Impeller, carb, hoses.... it runs as well as any other I've seen. You know I'll be on the water and making a video as soon as weather permits!

 

[Guest]

Re: 2hp Johnson for intex mariner 4

Nice enjoy your new ob. After you first trip I expect to see your troller on ebay lol. Your m4 is light so that 2 will fly you around real well. I expect speeds of 6-7mph

 

[Sinistre1]

Re: 2hp Johnson for intex mariner 4

Thats probly a very close estimate Weimed. My 2.5 moved my Mercury 340 at just under planing speed and everu once in a while, she'd get cheeky and try to climb over the hump and get on plane! Never did tho... Lol. More wheat thins I guess, lol.

 

[fbpooler]

Re: 2hp Johnson for intex mariner 4

People tend to underestimate the little 2 HP. We ran one for several years on a canoe and it did just fine. We replaced it with a 4 HP which was little if any faster, but it was a twin cylinder rather than the single cylinder on the 2.

You will not find many 2-4 HP motors with F-N-R gears.

If it is an Evinrude or Johnson, carry a shear pin and the plastic bushing which works with the shear pin with you. It is not unusual for this part to give way when the shear pin is sheared. Inexpensive insurance.

 

[Sea Rider]

Re: 2hp Johnson for intex mariner 4

Mrdrh99

Sorry to spoil the party, mission impossible to double the speed achieved with the Kota, due to having a flat bottom, no keel, thin tubes inflated to less overall pressure and worst of all having a non rigid transom, just a simple floating engine mount. Mix these 4 tech issues, fully throttle engine and stern will surely flex along engine downwards losing top prop trust. It's the nature of that type of beast.

Had a Sevylor K-86 same type as the Mariner 4, installed a Merc 2.5 HP, although the sib was inflated to near seam burst and engine mount was modified to stand still the combo performed awfull at wot, too much flexing at sib's rear including engine mount and engine along. Better flat displacement with less flexing was achieved at 1/2 to 3/4 throttle, will need to experiment for yourself which throttle range is best for your current set up. Post results for the record.

Happy Boating

 

[mrdrh99]

Re: 2hp Johnson for intex mariner 4

Thanks for the info sea rider.... I actually purchased the motor with intentions to purchase a Saturn kaboat later in the spring.... Probably the 13' extra wide version. I did have hopes of increased speed with the mariner but it will continue to be my electric motor boat, I'm going to have the two boats and use them in different locations.

 

[Sea Rider]

Re: 2hp Johnson for intex mariner 4

A sib with a standard fixed transom glued on tubes is other story compared to an engine mount attached with tube frames. It doesn't matter if you have topped your sib to its max working pressure, still will have unwanted stern flexing issues Anyway having any first entry sib is much cool than being stranded at any beach.

Happy Boating

 

[mrdrh99]

Re: 2hp Johnson for intex mariner 4

Sea rider.... Do you have a post showing your set up? I like looking... Esp at someone with so much experience!

 

[Sea Rider]

Re: 2hp Johnson for intex mariner 4

Mrdrh99

After sibbing for years, now into ribs, the next step natural way to go. I've been through many setups through the years, you can check some configurations here :

Sea Rider Photo Gallery by Luis Montero at pbase.com

Happy Boating

 

[Guest]

Re: 2hp Johnson for intex mariner 4

Rider you got a bad arse rib. Wish I had a place to keep my boat inflated all year round. I would then buy a rib and throw a new 25 on there. I see you are are using a Tohatsu. Bless that motor. LONG LIVE JAP ENGINES!

 

[fbpooler]

Re: 2hp Johnson for intex mariner 4

Don't dismiss the little 2 HP Johnson and Evinrude, as they go back to when outboards were perfected and found to be reliable. They have an impressive lineage and are capable of extremely good service even after many years use.

There is a Mercury branded Tohatsu, a Nisson, a Yamaha, and a 1951 7 1/2 HP Evinrude sitting in the garage. Any one of them give excellent service if cared for. We ran the dickens out of 5 1/2, 15 and 18 HP Evinrude/Johnson motors which were top flight. Now nearly all small motors are made in Asia. You would not go wrong with any of them.

 

[mrdrh99]

Re: 2hp Johnson for intex mariner 4

Having trouble getting the ob running yesterday..... I'm in the other threads and think it's in the fuel lines.... Team like butter the day I picked it up....

 

[Guest]

Re: 2hp Johnson for intex mariner 4

Having trouble getting the ob running yesterday..... I'm in the other threads and think it's in the fuel lines.... Team like butter the day I picked it up....

can you make a quick youtube video in a bucket and tell us the problem

 

[mrdrh99]

Re: 2hp Johnson for intex mariner 4

I will next week.... Headed out if town today for the weekend. Like they say in the other thread I think it's the routing of that fuel line along with air trapped inside. I'll put up a pic of that in here just for reference.

 

[fbpooler]

Re: 2hp Johnson for intex mariner 4

The fuel is gravity fed, so it is piped wrong. The inlet on the carb should be at the lowest point of the gasoline tubing with the tube running down to it.

What is that plastic gismo in the fuel line? Someone must have tried to add a fuel filter and messed up the gas flow.

 

[mrdrh99]

Re: 2hp Johnson for intex mariner 4

Yeah... He added a filter in there.... I'm not sure if he knew about the switch serving a dual purpose

I'll have to look over it but I don't see where else the fuel line could go into the carb. The idle screw and the drain at the bottom are the only other points of entry/exit I see. But I'm not at home nor am I knowledgeable about such things. But I'm gonna figure it out!

 

[fbpooler]

Re: 2hp Johnson for intex mariner 4

Look at your picture. The fuel inlet is on the side of the carb and the line should be routed beneath the carb or immediately above it for best fuel flow while filling the float bowl with fuel..

The vertical loop of tube forms an air pocket which kills gas flow. Liquid must be allowed to flow down from the tank by gravity unless you put a fuel pump in the line.

If you want to get technical, the fuel weight on each side of the loop cancels each other out once the line is full with no air present. Gravity fills the line if the end of it is vented, but the float valve in the carb traps the air in the line. Once you get the fuel to fill the tube, the motor will run. It is a sorry way to run the fuel line as it is now run.

The liquid head available from the tank is from the surface level of gas in the tank down to the inlet on the carb. Bet you can work it out without any more advice, but the air in the line is a dead giveaway of the problem.