Johnson 70hp seahorse help needed

[weggo]

iv just got a Johnson 70hp seahorse mag flash i want to know the age i cant find the numbers on it all i can find is on the top is a round thing it has M then under that is B06407 under that 70HL780.also after a manual for it.can anyone tell me any info at all on this motor anything will help.cheers all

 

[willamettejeff]

Re: Johnson 70hp seahorse help needed

Your outboard is of the 1978 vintage. Oh, and its a long shaft for 20 inch transom. Don't know what the 'H' stands for. If it was an 'E' then it would be electric start. And are you sure that's not a 'C' on the end?

 

[weggo]

Re: Johnson 70hp seahorse help needed

thanks yes it is a C.got another problem now.i changed the petrol pipes under the HUD. there are three pipes. the new pipe is 2mm bigger and when i started it it turned over i pumped petrol the usual way then it stopped turning over. i took the plugs out and the bottom pot was full of fuel to the point that it stopped it turning over .it started at first then allot of black oil came out from all over it was running fine before i was told to change these pipes.could this be the pipe is to big and to much fuel is pumping in.it isn't leaking at any of the pipes.thanks again greai site this by the way

 

[willamettejeff]

Re: Johnson 70hp seahorse help needed

Don't think the size of the fuel lines is the problem. One of those lines goes to the crankcase to provide the pressure pulse that operates the fuel pump. Wonder if you didn't get them mixed up somehow and your actually feeding fuel to the crankcase instead of the carbs? I'm guessing that's it.

-- Jeff

 

[weggo]

Re: Johnson 70hp seahorse help needed

thanks Jeff i will try that that sound like something i would do.also in one of the pipes i took of iv just noticed a long spring that goes in side the pipe i will put that in also.thanks again i feel a bit better now thought it was goosed.cheers Neil tell you what this site is brilliant

 

[weggo]

Re: Johnson 70hp seahorse help needed

can anyone tell me the right fuel pump i need for this outboard iv looked on iboats marine store to buy one but there are several to pick from so if you no the one i need can you give me the order number so i can be sure to get the right one thank for your help

 

[willamettejeff]

Re: Johnson 70hp seahorse help needed

BRP-0438559 which superseded BRP-0385784

 

[weggo]

Re: Johnson 70hp seahorse help needed

I'm glad you are on here I've tried allot of sites emailed and rang places to try and get this fuel pump and I'm getting no were.do you know or anyone know were i can get this part from as I'm at my wits end with it.some say you cant get it,some say i can use one of a 60hp but at full throttle it will cut out from fuel starvation,iboats emailed me saying they don't do this pump i need help i cant get out on my boat and the weather is perfect for it.thanks again for your excellent help so far.Neil

 

[F_R]

Re: Johnson 70hp seahorse help needed

I assume you are somewhere in Great Britain? Have you no Evinrude dealers there? The number given is correct, 385784. It is available. I'll bet the 18-7353 here at iboats will work, but can't say that for certain.

 

[Vic.S]

Re: Johnson 70hp seahorse help needed

Couple of good dealers for parts in the UK are

www.willsmarine.co.uk in Kingsbridge, Devon

and

www.outboards-direct.co.uk (AKA Oakley Marine) in Brighton

Im sure there are others but those two i have made a note of

BTW I would have guessed that model number to be 70EL78C making it a 1978 Johnson !
I would not have said it was necessarily a 20" shaft model. Same number equally applied to the 15" shaft model

If that is right manuals from KEN COOK

 

[weggo]

Re: Johnson 70hp seahorse help needed

thanks guys ,yes i am in the UK i will ring those right now and let you know.if no joy i will try the 18-7353 part.cheers all

 

[weggo]

Re: Johnson 70hp seahorse help needed

thank you very much ,its on the way.got one from outboard direct ?92.it will be here by monday out bye tuesday happy man.funny ive been all round the world triing to get this part i never left my armchair.thanks again. No dowt ill be back with another problem.realy good site this:d:d:d

 

[Vic.S]

Re: Johnson 70hp seahorse help needed

realy good site this

It is. The best i know for outboard help esp the Johnson and Evinrude board

I use the YBW.com forums in the UK but always recommended i Boats for any outboard questions that don't get answers on there. ( Visit and you'll soon recognise my dragon )

Glad you got good service from Outboards direct. I had good service from them too recently. Took a few days for the part to arrive because it had to come from Belgium but I had a telephone response to my initial email enquiry within a couple of hours.