4 HP yamaha carb

[whatever4]

Have 4 HP Yamaha that runs fine as long as you leave it on choke. When you take the choke off, it runs wide open....can anybody help? Bill

 

[JUSTINTIME]

Re: 4 HP yamaha carb

sounds like your idle srew is turned in too much

 

[whatever4]

Re: 4 HP yamaha carb

sounds like your idle srew is turned in too much

No change....handle speed indication is reversed....sure need some help with this problem

 

[JUSTINTIME]

Re: 4 HP yamaha carb

try clening the carbs and checking all fuel lines and vent lines, check filter also

 

[deejaycee_2000]

Re: 4 HP yamaha carb

you will need to take that carb off and soak in carb cleaner overnight the blow out with compressed air make sure you reach all the hard to reach places, make sure you put it together correctly ..... to adjust your air mix screw, turn it in to soft stop then out 1 & half turns out .....

 

[herbergboat]

Re: 4 HP yamaha carb

My 2005 4hp will not idle. Is there an accessable idle adjustment screw? I put in a new plug and that does not help. Someone said that the idle is factory preset to meet emission standards and that I may have to drill out a plug that covers the idle screw. He suggested that I look at a schematic diagram to see if this is the case. Can I access a schematic on line?
Thanks,
Tom

 

[JUSTINTIME]

Re: 4 HP yamaha carb

brownspoint.com