yamaha 25 2 stroke wont run

[BeerCanBobsta123]

my 25hp yamaha has not been run in 2 months, it was llying down for a few weeks.<br />now it will not run properly, i can get it to start but it runs really rough and i cant increase the revs, it runs for about 30seconds then stalls, on checking the plugs after 30 seconds they are black, so i clean them up and it happens again and again and................<br />any ideas???

 

[Backlash]

Re: yamaha 25 2 stroke wont run

Hi BCB,<br />How did it run before the storage? Are the plugs oily black? I'd suspect bad gas personally but without more information, it's just wild speculation.<br />Backlash

 

[Franki]

Re: yamaha 25 2 stroke wont run

Are you using the same gas that it had before the 2 month break?? if so, mr Backlash is correct .. stop that and get some new stuff...<br /><br />Also, if the carb/s float chambers were left with fuel in them before the 2 months, then they may have gummy fuel residue in them that could be causing the rough running problem as well.<br />(although I suspect just changing the fuel will do the trick..)<br /><br />rgds<br /><br />Frank

 

[BeerCanBobsta123]

Re: yamaha 25 2 stroke wont run

thanks for the info, yes the plugs are oily black.<br />fuel is fresh and mix is 100:1. going to pull the carby apart<br />

 

[ehenry]

Re: yamaha 25 2 stroke wont run

You'd do well to get another tank of gas mixed at 50:1. Thats what that enging calls for. 100:1 is too lean. You'll damage your engine running it on 100:1.