johnny 70 hp 1981

[carlos bairo]

hi guys, need help to find how to drain the carburetors on my johnny .normally i switch of the fuel and let the motor run till
run of fuel.but it remain fuel on the carb's bowl till the next trip .i ll like to kept the carb's clean .the are no drain plugs that i could see like on my 5 hp aux tohatsu motor ,what will be the best way to do it?

 

[175se]

Re: johnny 70 hp 1981

The only way is to remove the air box, the screws are on the front of the bowls. That seem like a bit of trouble, but. Do you stabilize your fuel or does it sit for extended periods.

 

[carlos bairo]

Re: johnny 70 hp 1981

The only way is to remove the air box, the screws are on the front of the bowls. That seem like a bit of trouble, but. Do you stabilize your fuel or does it sit for extended periods.

thanks for the advice.,no i have't stabilize the fuel,how do i do it and what type of product to use ,i am new on this ,

 

[175se]

Re: johnny 70 hp 1981

I use a product called Sea-Foam, don't know what you have down there, a good stabilizer sta-bil marine or something like that should work. Just follow the instructions on the container ,should do it.

 

[racerone]

Re: johnny 70 hp 1981

Simply remove the fuel hose and run the carburetors dry.

 

[carlos bairo]

Re: johnny 70 hp 1981

thanks gys,

 

[Daviet]

Re: johnny 70 hp 1981

Runnig a multi-carb engine dry is not a good idea, all the carbs will not run out of fuel at the same, a cylinder or two will run for a short period of time with no lube on the cylinder wall.
Some people do it, but why take the chance.

 

[carlos bairo]

Re: johnny 70 hp 1981

Runnig a multi-carb engine dry is not a good idea, all the carbs will not run out of fuel at the same, a cylinder or two will run for a short period of time with no lube on the cylinder wall.
Some people do it, but why take the chance.

that is a good open topic .no one know much about. i like to hear more on this important meter .

 

[racerone]

Re: johnny 70 hp 1981

When the engine is running oil has to coat all the parts in order for the oil to lubricate them.-----When one carburetor runs out of fuel there is plenty of oil on the parts to lubricate them for 10 seconds or so.-------The oil coating all the parts simply can not instantly disappear !!!!!

 

[carlos bairo]

Re: johnny 70 hp 1981

When the engine is running oil has to coat all the parts in order for the oil to lubricate them.-----When one carburetor runs out of fuel there is plenty of oil on the parts to lubricate them for 10 seconds or so.-------The oil coating all the parts simply can not instantly disappear !!!!!

yes i realize that ,but i do't think that 10 seconds is much time ,it may be the other cylinder's work for other 20 -40 seconds more.
on this case this cylinder will be out of oil for 20 or 30 extra seconds .i wont take that chance, thanks for the good advice.

 

[carlos bairo]

Re: johnny 70 hp 1981

When the engine is running oil has to coat all the parts in order for the oil to lubricate them.-----When one carburetor runs out of fuel there is plenty of oil on the parts to lubricate them for 10 seconds or so.-------The oil coating all the parts simply can not instantly disappear !!!!!

yes i realize that ,but i do't think that 10 seconds is much time ,it may be the other cylinder's work for other 20 -40 seconds more.
on this case this cylinder will be out of oil for 20 or 30 extra seconds .i wont take that chance, thanks for the good advice.

 

[racerone]

Re: johnny 70 hp 1981

Lubrication of 2 stroke engines and what happens to the oil after the going through the carburetor is just not well understood !

 

[carlos bairo]

Re: johnny 70 hp 1981

Lubrication of 2 stroke engines and what happens to the oil after the going through the carburetor is just not well understood !

o thanks? i misunderstood you post,

 

[racerone]

Re: johnny 70 hp 1981

Examine 2 V-4 outboard motors one being a Yamaha and the other a Johnson.-----Take them apart and you will see parts that are nearly identical in form and function.----The johnson mixes the fuel BEFORE the carburetor.----The Yamaha injects the oil after the carbuuretors with 4 wee hoses.----At idle the oil is injected say one drop at a time but not for every revolution of the crankshaft.----How then do you think the motor is lubricated between drops of oil ???