XR70 won't idle?
Posted 27 May 2002 - 04:10 AM
There are two adjustments on the carb, one is the idle adjust screw and the other (which is on the same side to the lower left) is a blunt nosed needle. Does anyone know what this needle is (fuel or air) and what its stock setting should be? I am trying to take care of this problem this morning so I can take my daughter out riding today.
Posted 27 May 2002 - 08:32 AM
It sounds like the bike is lean in the pilot if can only run with the choke on. Turn the pilot screw open 1/2 to 1 turns.
Once you get the bike to run and idle, slowly turn the fuel screw in and out until the engine idles the fasters. Then turn it out 1/8 turn.
Most bikes need 1 to 2-1/2 turns out from fully seated.
On my Keihin carb, I can get to the pilot jet by removing the float bowl, though on an XR70, it may be a bit different.
If the bike hasn't been run for a long time, drain the carb float bowl and look for varnish. Run some carb cleaner additive in the gas.
Posted 28 May 2002 - 09:46 PM
If that is the case you will need either a regular submersion type carb cleaner and quiet a few hours or to clean the passage manually with a fine wire. I use welding tip cleaners. You can actually damage the passage though so go easy. Wire from a wire brush can work too.
While you have the float bowl off, set the floats as well.
good luck and I hope she appreciates you!!
Posted 28 May 2002 - 05:18 PM
Thanks for you advice,
BTW, she is 10 now. I expect that by the time she is twenty-something that she will really start to appreciate me.
Posted 29 May 2002 - 09:25 PM
Glad the bike is working. If the plug was dark, that is from having to run the choke so long. With the passage cleared out you should not have to do that and your plug will last until she is 20.(its been done, honest)