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Old 02-13-2013, 04:41 PM   #1
Miloman
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Crf50 problem again help!

For some strange reason now when I ride my Honda crf 50 it dies when u lean it over to the left side??? It has the tb88 full kit with race head and a sheng wey pz20 carb. Bike ran fine before with no problems and now this? I'm running a 38 pilot and 92 main jets. Appears to be getting spark.. Oh and it only dies when u lean the bike over to the left- not the right. And I did not touch the bike or work on it- like it randomly developed this problem? Also dumps gas out of the overflow tube of carb when u lean it to the left. Did something in my carb just brake? Float related? Thanks
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Old 02-13-2013, 04:47 PM   #2
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For some strange reason now when I ride my Honda crf 50 it dies when u lean it over to the left side??? It has the tb88 full kit with race head and a sheng wey pz20 carb. Bike ran fine before with no problems and now this? I'm running a 38 pilot and 92 main jets. Appears to be getting spark.. Oh and it only dies when u lean the bike over to the left- not the right. And I did not touch the bike or work on it- like it randomly developed this problem? Also dumps gas out of the overflow tube of carb when u lean it to the left. Did something in my carb just brake? Float related? Thanks
yup you need to clean it all out, i had the same problem as well
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Old 02-13-2013, 05:08 PM   #3
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I'd clean the carb and inspect the float and float needle. Make sure no dirt or grit made it into the carb. Then see if the problem remains.
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fkn kdogg just started staring at me like i'm bout to jump off this bike and murder some dave c. i was thinkin ok lets see what i did to this man to make him hate me and how fast can i run
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Old 02-13-2013, 05:12 PM   #4
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Float is stuck or float valve is deformed...
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Old 02-13-2013, 05:48 PM   #5
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Thanks guys I just took the carb back off and everything looks clean( no obvious dirt or grime or ethanol deposits in float bowl) the float itself seems to function properly and the needle valve moved up and down freely. This carb still looks new inside and out (it was installed with the big bore kit around 5 months ago). Guess I'm going to soak the needles and spray some spray then see what happens. Thanks again for the help
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Old 02-13-2013, 06:01 PM   #6
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It's possible that your float needle valve is not sealing properly, causing fuel to flow out of the overflow vent hose coming from the float bowl. Normally, if this happens, it shouldn't matter if it's tilted one side or the other.

You can test the needle valve sealing area by leaving everything in place on the carb except for the bowl. Hook the carb up to the bike at the intake manifold like normal, hook up the gas line from the gas tank and turn the petcock to the "on" position. Gas should flow through the carb into where the bowl would normally be (making a mess). With your finger, push up on the float. This should cut off the flow of gas into the carb float bowl area. If it doesn't stop the flow of gas and leaks, then it's not sealing right.

Worth a try, anyways.
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fkn kdogg just started staring at me like i'm bout to jump off this bike and murder some dave c. i was thinkin ok lets see what i did to this man to make him hate me and how fast can i run
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Muhammad.........Nostradamus..........Kdog
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Old 02-13-2013, 06:28 PM   #7
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Will do thanks kdog I never would of thought of that
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Old 02-15-2013, 01:14 PM   #8
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Cleaned and reinstalled carb. The float valve seemed to work properly. Put back together and same thing is happening! When u lean the bike over to the left it sputters and dies- when it's leaned to the right nothing happens at all. Upright is fine also. Only when u lean the bike to the left even just a lil bit it dies. And still gas comes out of the overflow tube when leaned far to the left- but not far to the right.. Any more thoughts on this my life sucks without my 50 lol
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Old 02-15-2013, 03:45 PM   #9
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Check the float height?
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Old 02-15-2013, 04:27 PM   #10
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There are several places online to get another carb. The stock carb I believe is a 12cfm(sp) and you can safely upgrade to a 18 but nothing bigger. They are very cheap like $20 if you look around. The stock carb is junk, and you can really wake the stock 50 up with the carb and CDI box for very cheap!

I wouldn't waste any more time on it...sounds like carb issues!
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Old 02-15-2013, 04:49 PM   #11
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The carb is a sheng wey 20mm that came with the tb88 big bore kit w cam n race head n cdi. Re jetted with 38 pilot and 92 main and needle cliped 1 notch.Not stock carb or stock 50. Iv had no problems whatsoever with my carb Untill now and it's only been 5 months or so since install.
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Old 02-15-2013, 04:52 PM   #12
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Any one know what the float height on a sheng wey pz20 carb should be? Could it randomly change float height?
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Old 02-15-2013, 04:53 PM   #13
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just buy a bigger carb for it and call it a day. buying parts for those carbs are useless
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Old 02-15-2013, 05:25 PM   #14
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Stock is 18mm and I have a rejetted 20mm on now that came in the kit. It use to run perfect with no off idle Bogg and had crazy top end would top out over 50mph with my gearing and now this.. So my tb parts sheng wey carb is just junk and i should go even bigger like a mikuni 22mm? or vm26? Seems like a lot of carb for a 88 but I'm not an expert on this.. Which reminds me -where is magicman
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Old 02-17-2013, 11:59 AM   #15
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Old 02-23-2013, 12:15 PM   #16
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Ok here is what was going on w my 50... The slide in the carb(thingy with needle on the bottom in carb attached to throttle cable)has a slanted flat spot cut into it where the air screw seats. This spot was dented due to over tightening the air screw(looks like somebody placed a nail there and whacked it with a hammer) and is causing my 50 to do what it's doing. So if you experience the same problems as me and have checked to make sure it's not the float related then remove and look at your slide. If that smooth area on the slide where the air mix screw seats is dented your bike will run like and die when leaned over
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