2005 Yamaha YFZ450
Hey guys I have a 2005 yfz450 special edition I recently bought and it was standing for about 5 years I’m not sure if it was just standing without driving at all or someone drove it occasionally. It started and seemed to work and drive fine but the choke was working as it was reversed so when you pull on it the idle falls down and you push it in it raises but not too drastically but enough to where you can hear the idle change. It worked fine only when it is pushed in and has the higher idle otherwise it would be choppy and bog at low rpm. So I thought why not do a carb rebuild anyways since it’s been standing for a long time and it is not going to hurt anything. I flushed the gas from the fuel tank and put a new fuel petcock in and tore into the carb I even did the mid body gaskets and they were toasted blocking one of the small passages, everything went great and I thought it should be good, but no I put it back in and the choke seems to work the same reversed way although I had a moment were it started working great and the choke started working properly so when you pull the idle raises and you put it in it falls, but that was only for about a minute the idle adjustment screw is screwed all the way in as well and the adjustment really doesn’t do much. The bike has a drd exhaust, a k&n filter, and no lid from what I know. The jets were 45 for the pilot and 178 for the main so I just decided to clean them out really good and put them back I could clearly see through them before I put them back in it wasn’t like that before the cleaning. But it was wasn’t working good so I then removed it and even put the stock jet sizes back in and still wasn’t good. I also put a r&d fuel screw and have it 1 3/4 out. Sorry for the the long story but what I basically have currently is a cleaned out fuel tank, new petcock, cleaned out carburetor, 45 pilot and 178 main I also live in Washington just so you can get a reference of the sea level that I’m at, the fuel screw is 1 3/4 out, the needle is set to the 4th clip position, idle adjustment all the way in and it doesn’t do much, choke is working as it is reversed, very choppy and bogs when driving during low to mid rpms but pulls great up high, sometimes even dies, and it is hard to start occasionally. I also tried unscrewing the choke all the way and then the bike brings up the rpms really high. Any help will be appreciated it thanks and sorry for the super long paragraph that I probably wrote horribly.