Posted February 06, 2010 - 11:22 AM
Posted February 06, 2010 - 05:06 PM
Posted February 06, 2010 - 05:46 PM
Posted February 06, 2010 - 05:48 PM
Posted February 07, 2010 - 06:43 PM
Posted February 07, 2010 - 08:22 PM
Posted February 07, 2010 - 08:41 PM
Posted February 07, 2010 - 09:04 PM
Posted February 08, 2010 - 04:41 AM
Posted February 08, 2010 - 01:58 PM
Posted February 13, 2010 - 07:54 PM
Posted February 14, 2010 - 09:01 AM
Fuel comes intot he carb Float bowl fromt he fuel line into the swivel fitting (not easily removable anyway) and past the Needle and Seat (attached to the float by the pin you mention) and into the float bowl until the bowl fills to the set float level, and as the float rises in the fuel, the Needle contacts the seat to stop the flow of fuel. This reserve of fuel is then metered into the intake by several jets located in different locations within the float bowl. The Main, Needle, and Pilot jets are centrally located in the bowl. They are brass or copper colored, and difficult to miss. I recomend downloading a Yamaha manual for your bike and thoroughly going over the carb section. At a minimum, while you have the whole carb off, I would soak it overnight in some carb cleaner. It wont' hurt to submerge the whole unit. It would be better to take each part off of the carb, and soak them individually, but this should get you going again. I think you probably could re-install it and get the bike to run now that the float is free, but it may not seal up properly, and you may have some debris in the jets now. You should be able to blow (Low Pressure) air through the inlet swivel and feel it coming through the Neelde Seat area into the float bowl. Hope this helps, sorry if I'm rambling.
Posted February 14, 2010 - 05:37 PM
Posted February 14, 2010 - 08:48 PM
Posted February 15, 2010 - 06:12 AM
is this what i need to do
This looks like it should work for you. Good luck, and be gentle with this thin area of your carb.
the pliot jet was the only jet that was dirty that i removed. it had green discoloration and some partilcles fell out when i removed it. When i blew through the inlet swivel i couldnt hear or feel any air comming out so could the needle and seat be the problem? is the float suspossed to make any clicking noises when it is completly up or down? so if i blow air through the gas line and hold my hand by the float i should fell the air flowing if the float isnt pushed up? also is it normal for the jet needle to not stay centered in the hole when you remove the needle jet? i think my wr426 still has the stock throttle stop as well because when i twist the throttle all the way open the throttle valve only looks a liitle more than half way opened up. thanks for taking the time to help me out its much appreciated
OK, sounds like you are getting there. The inlet swivel is where the gas line connects to the carb. Yes, if your needle is not in contact with the seat (Float Down), you should be able to move air through the inlet and into the carb. You can also do this with a spray type carb cleaner. If this is clogged or plugged, then you will never get enough fuel into the bowl to run the engine. This is likely your problem. I said to use low pressure so that you don't accidentally damage anything in the carb. I've seen needle and seat get lost in the garage before, I've also seen diaphrams and such get damaged on other carbs due to high pressure air guns. Anyway, you're on the right track, I would remove the float and inspect the needle and seat, might be a good time to replace them anyway. Not sure about the clicking noise, but this could be just the needle rattling around in the needle jet, not sure without actually looking at it myself.
Yes, the needle will be loose in the carb when the needle jet is removed, this is OK.
Could be that the throttle stop is still stock, if you do some searching on here you can identify the proper length for the YZ stop, and then you can either cut yours off, or replace with the YZ part.
Hope this helps.
Posted February 15, 2010 - 03:18 PM
Posted February 15, 2010 - 04:06 PM
pic of the needle still attached
Posted February 15, 2010 - 06:59 PM