77 70 hp johnson

[leeman24]

I have a 77 johnson 70 hp that is giving me alot of trouble when you first put it in the water it starts right up let high idle for a minute than put the boat in gear is when the trouble starts.you have to mess with the throtte to get the rpms up but when you get the engine to work it has all kinds of power it will push the boat 35 to 40 mph but after it runs for about 10 mins starts dying than all you can do is start it.it will idle high and low but will not take any load what so ever it will completly dye if you try to put it in gear and go.if you pull the plugs out thay are soked with fuel ,I have already rplaced the fuel pump ,3 carb kits,one new coil another bit of history the boat sat covered with plastic for at least 5 years

 

[jtexas]

Re: 77 70 hp johnson

welcome to the forum!

first, here's some good reading on "Awakening a Sleeping Outboard" :
http://www.iboats.com/bbboard/bbBoa.../bbBoard.cgi?a=viewthread;fid=36;gtid=1035575

The part about getting a manual is really good advice.

Start with compression and spark test - post your results.

When you rebuilt the carbs, did you soak 'em good and blow out the passages?

Did you link & sync?

Did you dump the old fuel & clean out the tank?

What led you to replace the one coil?

What spark plugs are you running?

 

[leeman24]

Re: 77 70 hp johnson

welcome to the forum!

first, here's some good reading on "Awakening a Sleeping Outboard" :
http://www.iboats.com/bbboard/bbBoa.../bbBoard.cgi?a=viewthread;fid=36;gtid=1035575

The part about getting a manual is really good advice.

Start with compression and spark test - post your results.

When you rebuilt the carbs, did you soak 'em good and blow out the passages?

Did you link & sync?

Did you dump the old fuel & clean out the tank?

What led you to replace the one coil?

What spark plugs are you running?

 

[leeman24]

Re: 77 70 hp johnson

welcome to the forum!

first, here's some good reading on "Awakening a Sleeping Outboard" :
http://www.iboats.com/bbboard/bbBoa.../bbBoard.cgi?a=viewthread;fid=36;gtid=1035575

The part about getting a manual is really good advice.

Start with compression and spark test - post your results.

When you rebuilt the carbs, did you soak 'em good and blow out the passages?

Did you link & sync?

Did you dump the old fuel & clean out the tank?

What led you to replace the one coil?

What spark plugs are you running?

 

[leeman24]

Re: 77 70 hp johnson

I have the manual, compression in the engine is goodthe, one coil was replaced because it was deadwhen, I rebuilt the carbs they where soked overnight in a carb bath ,it is a new tank and fuel line and fuel spark plugs are champion Marine. don't quite understand the link and sink

 

[tashasdaddy]

Re: 77 70 hp johnson

sound like it's flooding out, email me ask for joe reeve carb adjustments. the link & sinc has to be follow exactly to set the carbs and the timing so the perform at the same time.
tashasdaddy@comcast.net.

 

[jtexas]

Re: 77 70 hp johnson

Yup, get the Joe Reeves write-up from tashasdad - good stuff.

let us know how it turns out.

 

[leeman24]

Re: 77 70 hp johnson

well my motor is fixed i broke down and toke it to my local johnson dealer they made some carb adjustments and synchronize them with the timing had the boat out sking this evening works great than for eveyone help and advise

 

[leeman24]

Re: 77 70 hp johnson

sound like it's flooding out, email me ask for joe reeve carb adjustments. the link & sinc has to be follow exactly to set the carbs and the timing so the perform at the same time.
tashasdaddy@comcast.net.

 

[tashasdaddy]

Re: 77 70 hp johnson

glad it's running, also i like the feedback that a diagnois worked. even thou the dealer did it.