SHAAGAR Posted August 13, 2005 Share Posted August 13, 2005 Good evening to everybody i wonder if any of you can help me ? My yzf is playing up,its running really rich,so rich that's its of the scale at a dyno tuners, I've replaced the jets with new ones two size's lower,its better but that still hasn't fixed it. The bike is hard to start up when cold and seems to run on 3 cylinders but after its warmed up it runs fine in fact sweet as a nut. The bike has had no mods to it what so ever it is totally standard,and the exup is set correctly,I've stripped the carbs and there all ok with all the diaphragms in good condition and the needles are in the correct sequence,there's also new plugs and filters on it. Also the choke doesn't work correctly. I'm stumped can anybody help me please???? The bike is a 1996 model, 4HD5 engine. Link to comment Share on other sites More sharing options...
sheeny7 Posted August 14, 2005 Share Posted August 14, 2005 hi ya,couple of things you can try mate for one get the choke sorted that won't help and have you had the carbs balanced lately because that would cause it to run rough on tick over!! mine runs really rick as well but i have a full system on it and have no exup valve!! cheers Link to comment Share on other sites More sharing options...
SHAAGAR Posted August 18, 2005 Author Share Posted August 18, 2005 I have already checked the carb ballancing and that's ok also the choke movement on all the cables is fine so in theory the bike should run fine,got any more ideas. Link to comment Share on other sites More sharing options...
sheeny7 Posted August 20, 2005 Share Posted August 20, 2005 I would check from basics onwards even down to valve clearances!! could even be a coil or lead.. One thing i did find when workin on mine is if you look at a workshop manual and look where the main air jet and pilot air goes its the oppisite way round done ask why cause its made some headaces with me and some yamaha techicians i know.. One thing i'd say as well and i dont mean to tell you how to suck eggs is get the carbs set up on sum good dyno and carb balances one main prob i had with mine was cheap ones dave Link to comment Share on other sites More sharing options...
Moderator Beezkneez Posted August 23, 2005 Moderator Share Posted August 23, 2005 are your floats set to the right height ? Link to comment Share on other sites More sharing options...
SHAAGAR Posted August 27, 2005 Author Share Posted August 27, 2005 I believe they are but i have to buy the correct tool for the job (a bit of plastic tube doesn't really give you the best check in the world)unless anybody knows the measurement from the bottom of the carbs to the top of the float Link to comment Share on other sites More sharing options...
Admin Alex Posted August 28, 2005 Admin Share Posted August 28, 2005 Sounds like its going to be one of them annoying ones, jsut need to start checking from the most basic bits onwards. BUT get that choke sorted first Link to comment Share on other sites More sharing options...
sharpie62k Posted October 7, 2005 Share Posted October 7, 2005 Sounds like its going to be one of them annoying ones, jsut need to start checking from the most basic bits onwards. BUT get that choke sorted first I had a very similar problem with my YZF. Seemed to be a carberation problem but was infact an ignition prob. Hair line crack in a plug cap was creating an intermitent misfire. New plug cap and HT leads completely sorted it Link to comment Share on other sites More sharing options...
Admin Alex Posted October 8, 2005 Admin Share Posted October 8, 2005 And the annoying thing is its always the last place you look Link to comment Share on other sites More sharing options...
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