zak Posted January 7, 2013 Report Share Posted January 7, 2013 Bike will only start with the choke on and takes about 10 secs for revs to go down when revved have cleaned carb and is still no better Quote Link to comment Share on other sites More sharing options...
tony27 Posted January 7, 2013 Report Share Posted January 7, 2013 Time for crankseals from what you describe, the gearbox side seals don't leak as often as the ignition side seals but you may as do them at the same time. Get a set of viton seals & clutch cover gasket off splatshop, you'll need to remove the clutch as well as the primary drive gear to do the gearbox side seal & both the flywheel & stator to do the ignition side seal 1 Quote Link to comment Share on other sites More sharing options...
copemech Posted January 8, 2013 Report Share Posted January 8, 2013 Very possible, yet we know nothing about the bike, or your ability to properly clean the carb! Sorry, but the only thing I assume is the worst! 1 Quote Link to comment Share on other sites More sharing options...
zak Posted January 8, 2013 Author Report Share Posted January 8, 2013 thanks Quote Link to comment Share on other sites More sharing options...
zak Posted January 8, 2013 Author Report Share Posted January 8, 2013 what would of caused this Quote Link to comment Share on other sites More sharing options...
tony283 Posted January 8, 2013 Report Share Posted January 8, 2013 deal with the simple things first, most likely a blocked Pilot jet Tony Quote Link to comment Share on other sites More sharing options...
zak Posted January 8, 2013 Author Report Share Posted January 8, 2013 Have cleaned the carb over and over again ant still no better Quote Link to comment Share on other sites More sharing options...
dombush Posted January 8, 2013 Report Share Posted January 8, 2013 Zak apologies if slightly patronising. When you removed the pilot jet for cleaning, did you hold it up to the light to check that the jet orifice was clear and was circular (not partialy blocked)? also when you blasted all the various orifices with air, were all of the jets and the idle screw removed? similar to other posts, the work gets more complex / time consuming from here so its worth checking. Let us know your process to save us pointing you in the wrong direction. Dom Quote Link to comment Share on other sites More sharing options...
zak Posted January 8, 2013 Author Report Share Posted January 8, 2013 What is the idle screw and they were all clear Quote Link to comment Share on other sites More sharing options...
dombush Posted January 8, 2013 Report Share Posted January 8, 2013 (edited) Zak, your a man of few words. The idle screw (meant to say the idle mixture screw also called the fuel screw) is the brass slotted screw in the side of the carb. Have a look at this video in which most aspects of the carb and faults are explained. See minute 5:00 and minute 20:55 for the pilot and fuel screw http://www.youtube.com/watch?v=1EbXacjIV78. Also see this video (basic tools and uses carb cleaner but you get the idea) .Dom Edited January 8, 2013 by dombush Quote Link to comment Share on other sites More sharing options...
zak Posted January 8, 2013 Author Report Share Posted January 8, 2013 thanks dom very helpfull will try againg tomorow with the carb thanks will let u no how i get on Quote Link to comment Share on other sites More sharing options...
copemech Posted January 9, 2013 Report Share Posted January 9, 2013 what would of caused this So you see you get a bit of free training here! Yey being satisfied with the carb and all that, the seals may still be suspect, ad as we still have no idea about the age of the bike or when and how all this started. It does seem the standard rubber crank seals do not tolerate the alcohol induced fuel well over time and may weaken. I might also suspect a 125 to be a bit more sensitive ti this due to its smaller volumes which would throw things off more easily, yet not enough reports to tell for sure. Thus the recco for the Viton(resistant) seals for hopefully longer lifespan. Quote Link to comment Share on other sites More sharing options...
zak Posted January 9, 2013 Author Report Share Posted January 9, 2013 Copemech it is a sherco 125 2008 it was a full rebuild about 2 weeks ago they wouldn't go that quick would they????? Quote Link to comment Share on other sites More sharing options...
dombush Posted January 9, 2013 Report Share Posted January 9, 2013 Zak can you define "full rebuild" for us (some detail of the components replaced) Dom Quote Link to comment Share on other sites More sharing options...
zak Posted January 9, 2013 Author Report Share Posted January 9, 2013 new piston plus barrel new berings seals and gaskets Quote Link to comment Share on other sites More sharing options...
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