crf50 carb questions
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Registered User
Joined: Jan 2008
Posts: 1
From: Atlanta
crf50 carb questions
My girlfriend got herself a crf50, and I'm fixing it up for her. The carb was all clogged with congealed old gas, the air screw was 2.5 turns out, the spark plug was gapped wrong, and the air filter is missing. 
Searching this forum has been a great help, but I still have some questions.
I cleaned the junk out of the carb, turned the air screw back in to 1/2 turn (factory setting??), and put in a new plug gapped at .032. It runs much better now, but it has a bad hesitation when I open the throttle wide open from idle. Cruising at top speed in 3rd gear, it feels slightly faster if I back off the throttle a bit. Adjusting the air screw doesn't help, so I'm thinking I need to move the jet needle. It's on the 4th slot now. Anyone hazard a guess as to whether it should be leaner or richer? The plug was seriously burnt when the air screw was out 2.5 turns, but it looks OK now. Maaaybe still a little lean, but I probably wouldn't mess with it if it wasn't hesitating.
Also, I'm not sure where to set the idle. I have it set now where the bike pulls forward just a bit at idle in gear. Is that too high?
Finally, wtf is this?
That hose looks like it was probably connected to the stock airbox. Vacuum operated timing advance maybe?? The aftermarket filters for these things don't appear to have a connection for it, though, so maybe it isn't important?
Thanks!
Searching this forum has been a great help, but I still have some questions.I cleaned the junk out of the carb, turned the air screw back in to 1/2 turn (factory setting??), and put in a new plug gapped at .032. It runs much better now, but it has a bad hesitation when I open the throttle wide open from idle. Cruising at top speed in 3rd gear, it feels slightly faster if I back off the throttle a bit. Adjusting the air screw doesn't help, so I'm thinking I need to move the jet needle. It's on the 4th slot now. Anyone hazard a guess as to whether it should be leaner or richer? The plug was seriously burnt when the air screw was out 2.5 turns, but it looks OK now. Maaaybe still a little lean, but I probably wouldn't mess with it if it wasn't hesitating.
Also, I'm not sure where to set the idle. I have it set now where the bike pulls forward just a bit at idle in gear. Is that too high?
Finally, wtf is this?
That hose looks like it was probably connected to the stock airbox. Vacuum operated timing advance maybe?? The aftermarket filters for these things don't appear to have a connection for it, though, so maybe it isn't important?
Thanks!
Registered User
Joined: Jan 2008
Posts: 4
From: vita ca usa
Re: crf50 carb questions
My girlfriend got herself a crf50, and I'm fixing it up for her. The carb was all clogged with congealed old gas, the air screw was 2.5 turns out, the spark plug was gapped wrong, and the air filter is missing. Searching this forum has been a great help, but I still have some questions.
I cleaned the junk out of the carb, turned the air screw back in to 1/2 turn (factory setting??), and put in a new plug gapped at .032. It runs much better now, but it has a bad hesitation when I open the throttle wide open from idle. Cruising at top speed in 3rd gear, it feels slightly faster if I back off the throttle a bit. Adjusting the air screw doesn't help, so I'm thinking I need to move the jet needle. It's on the 4th slot now. Anyone hazard a guess as to whether it should be leaner or richer? The plug was seriously burnt when the air screw was out 2.5 turns, but it looks OK now. Maaaybe still a little lean, but I probably wouldn't mess with it if it wasn't hesitating.
Also, I'm not sure where to set the idle. I have it set now where the bike pulls forward just a bit at idle in gear. Is that too high?
Finally, wtf is this?
That hose looks like it was probably connected to the stock airbox. Vacuum operated timing advance maybe?? The aftermarket filters for these things don't appear to have a connection for it, though, so maybe it isn't important?
Thanks!
Searching this forum has been a great help, but I still have some questions.I cleaned the junk out of the carb, turned the air screw back in to 1/2 turn (factory setting??), and put in a new plug gapped at .032. It runs much better now, but it has a bad hesitation when I open the throttle wide open from idle. Cruising at top speed in 3rd gear, it feels slightly faster if I back off the throttle a bit. Adjusting the air screw doesn't help, so I'm thinking I need to move the jet needle. It's on the 4th slot now. Anyone hazard a guess as to whether it should be leaner or richer? The plug was seriously burnt when the air screw was out 2.5 turns, but it looks OK now. Maaaybe still a little lean, but I probably wouldn't mess with it if it wasn't hesitating.
Also, I'm not sure where to set the idle. I have it set now where the bike pulls forward just a bit at idle in gear. Is that too high?
Finally, wtf is this?
That hose looks like it was probably connected to the stock airbox. Vacuum operated timing advance maybe?? The aftermarket filters for these things don't appear to have a connection for it, though, so maybe it isn't important?
Thanks!
everybody i know and myself just took that black box thing that you circled off i just have the hose that goes into the motor hangin there and its been like thaat for 3 years now never had a problem and when the bike is in N it should not pull forword
540 BOYZ SUMO STUNTER
Joined: Oct 2006
Posts: 1,251
From: Fredericksburg, VA
Re: crf50 carb questions
Thats a Positive Crankcase Ventalation device....it sends blow by gasses that get past the rings back into the intake to be burned again...its mostly emmissions, but if your rings get wore out it may start leaking oil real bad.....you really want to run a tube from the fitting on your crankcase to underneath your bike. either way its not a big deal what you do with it...you cant really hook it back up unless you use your stock airbox....
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