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Old 01-15-2009, 01:52 AM   #1
blursxtypes
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Question Need some help fixing my CRF50F!

Hi motohouston! I bought a 2007 CRF50F a couple months ago and I haven't really had much chance to ride it up until now. Anyways, it ran fine when I first bought it but after 5 months of not

riding it, the bike won't run without the choke turned on. As soon as the choke is turned off, the bike dies out immediately. I just changed the oil and gave it a fresh tank of gas today but no luck. I'm

not sure what the bike's problem is, but I've been searching on this site and it looks as if my problem is the carburetor? I wasn't sure if it was the carburetor or not so I took the thing apart for

some cleaning anyways..but I have no idea where to start. Do I just dump this thing in a carburetor cleaner? If this don't fix the problem, I'm not sure what will! BTW here are some

pictures. Any help/suggestion is appreciated!
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Old 01-15-2009, 03:12 AM   #2
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since u already have it off i would get a big can of carb cleaner. take off the bowl, take off the float and needle , and needle, and spray the out of any jets, holes plugs anything.
Had i not taken it off i would have run some seafoam into the carbs let sit over night then run it some more.
later
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Old 01-15-2009, 09:26 AM   #3
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Quote:
Originally Posted by sixmassive View Post
did you check your fuel shut off switch?
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Old 01-15-2009, 09:30 AM   #4
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probably the carb. . .at elast you're mechanically inclined enough to have it off, you're already ahead of a lot of the people who post this sort of issue. Do as train said and clean everything you can, especially the jets, needle, and seat. Reassemble and you should be good to go. Do yourself a favor: If you start adjusting fuel/air screws, make notes of whick way you turn them and how many turns so you can always turn them back to stock if your results aren't satisfactory. keep posting questions, and we'll(most of us anyway) keep helping.
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Old 01-15-2009, 11:32 AM   #5
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be carefull what product you use. Some carb cleaning products will eat plastic and rubber So if you use a strong one be sure to remove anything that isn't metal. Oh and the first thing I normally check on a 2stroke is the sparkplug


1+ count the turns whenever you remove the screws on the carb
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Old 01-15-2009, 11:50 AM   #6
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Quote:
Originally Posted by jetcycles View Post
probably the carb. . .at elast you're mechanically inclined enough to have it off, you're already ahead of a lot of the people who post this sort of issue. Do as train said and clean everything you can, especially the jets, needle, and seat. Reassemble and you should be good to go. Do yourself a favor: If you start adjusting fuel/air screws, make notes of whick way you turn them and how many turns so you can always turn them back to stock if your results aren't satisfactory. keep posting questions, and we'll(most of us anyway) keep helping.
+1

luckily this carb is a VERY easy and simple carb to work on. good luck
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Old 01-15-2009, 02:21 PM   #7
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the main jet is clogged(where the slide needle goes) you may have to get a wire brush and pull one of the wires out of the brush, use the lone wire to clean the jets, then blow them out with compressed air and carb cleaner.
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Old 01-15-2009, 03:25 PM   #8
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Thanks for everyone's help! I'll keep you all posted on how this goes.
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Old 01-15-2009, 03:55 PM   #9
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Quote:
Originally Posted by Mr.Jones View Post
be carefull what product you use. Some carb cleaning products will eat plastic and rubber So if you use a strong one be sure to remove anything that isn't metal. Oh and the first thing I normally check on a 2stroke is the sparkplug

1+ count the turns whenever you remove the screws on the carb
a crf 50 is 4 stroke, just FYI
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Old 01-15-2009, 04:12 PM   #10
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Be careful when you clean the idle mixture screw. Some carbs have a spring, a washer, and a rubber ring inside the screw. Lose these and it will never idle or run at partial throttle.

Be careful to not spray on critical rubber parts with carb cleaner. They expand, and later break down.

Be careful and patient and clean it methodically and it should work out just fine.
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Old 01-15-2009, 07:21 PM   #11
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All right, so I cleaned the carburetor like how everyone said and got the bike running! But...it runs a little funny. I'll try and explain what the problem is the best I can. So the starts up fine now and it'll

run without the choke after it has warmed up. The problem is that when I snap the throttle open and close real quick, it feels like the bike's throttle is still open for about a second or 2 before it returns

to idle.. I'm not sure if this makes any sense, but I'm pretty sure this isn't normal. How should I go about fixing this problem? Thanks in advance!
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Old 01-16-2009, 01:10 AM   #12
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may be an air leak did you put the o-ring on the carb between intake. The air screw(not idle screw, in the center) needs to be adjusted, try 1.5 turns out.
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Old 01-16-2009, 01:17 AM   #13
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josh is a 50 pro

josh want to tune my 114 and fix my 88 for me
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Old 01-16-2009, 02:26 AM   #14
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josh is a 50 pro

josh want to tune my 114 and fix my 88 for me
lol, I have like eleventeen people lined up for me to do work, Got to get all the projects out of the garage first.
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Old 01-16-2009, 02:50 AM   #15
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well hurry up so i can give u 2 more lol
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Old 01-16-2009, 04:07 PM   #16
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Quote:
Originally Posted by josh302 View Post
may be an air leak did you put the o-ring on the carb between intake. The air screw(not idle screw, in the center) needs to be adjusted, try 1.5 turns out.
Would the o-ring be this rubber (torn) piece? BTW which screw is the air screw? Do you think the problem could be caused from the rubber piece being torn?
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Old 01-16-2009, 04:39 PM   #17
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Can you see light through the jets? And you should replace the o-ring.
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Old 01-16-2009, 04:48 PM   #18
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that is the problem. O-ring
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Old 01-17-2009, 08:45 AM   #19
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make sure you have a good seal from carb to intake, and if your bike only runs on choke your pilot jet is clogged just take the bowl of take out the main jet witch is the screw inn the very middle and the long one right next to it and the is the pilot jet you should be able to see threw both of them once they are clean, spray everything with carb clean and the bolt it all back up, should be good to go
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Old 01-20-2009, 11:12 PM   #20
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THANKS EVERYONE! I finally got the chance to replace the o-ring and it runs perfect now.
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