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Post by sjfishon on Oct 7, 2015 17:52:43 GMT -5
hi,, i have 2 49cc bash ans,, they are new, one runs perfect, after turning up the idle, the other has a slight surging, during warm up and during running, after it warms it seems to go away,, will this go away as the bike breaks in or could there be a problem,, thanks
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Post by jkeney on Oct 7, 2015 18:44:59 GMT -5
hi,, i have 2 49cc bash ans,, they are new, one runs perfect, after turning up the idle, the other has a slight surging, during warm up and during running, after it warms it seems to go away,, will this go away as the bike breaks in or could there be a problem,, thanks You sir have a vacuum leak or faulty petcock. At least thats my insight. |
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Post by katastroff on Oct 7, 2015 18:51:56 GMT -5
We have an expert here on those matters, spaz12. His fields of expertise are carbs and ponctuation. |
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Post by katastroff on Oct 7, 2015 18:52:41 GMT -5
There is a guy i know who also have a lot of carb problems. He works in a circus.
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Post by Fox on Oct 7, 2015 18:53:25 GMT -5
They are supposed to idle fast when cold and then slow down to a steady idle. Any surging or erratic behavior isn't right and could point to a vacuum leak somewhere. Check the carburetor area. The clamp that holds the carb on and the two nuts that hold that rubber intake boot on. Make sure they are tight and any vacuum hoses are firmly attached to the intake. A slight air leak anywhere right there will cause issues. Have you tried playing with the idle mixture screw on the carburetor? (See video below) If you have a sealed mixture screw you can remove the cap to access it. There's info on that at the link below. 49ccscoot.proboards.com/thread/5148/unsealing-carbs-mixture-tamper-screwsIt couldn't hurt to check the valve gaps on both your new scooters if you haven't yet. Even new they can be off. Lastly, if you haven't swapped out the cheap Chinese plugs for NGK C7HSA plugs I would suggest that as well. Mixture screw video www.youtube.com/watch?t=254&v=5SuIL9EtUZ0Valve adjust video www.youtube.com/watch?v=s0K-ytyjOFg |
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Post by spaz12 on Oct 7, 2015 18:56:33 GMT -5
Gotta run to physical therapy, but I'd say to check for vacuum leak. Good chance you have a pinched hose? Cracked hose? Even when they're new  |
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Post by sjfishon on Oct 8, 2015 11:10:23 GMT -5
good info all, esp. fox thanks for the vedios
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Post by Fox on Oct 8, 2015 11:53:59 GMT -5
good info all, esp. fox thanks for the vedios Thank Brent. He's the one that spent many hours filming himself wrenching and then editing all that footage. |
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Post by sjfishon on Oct 9, 2015 10:29:16 GMT -5
thanks Brent''''''''''' i did check around, and ,,fingers crossed, i might of found it. right where the carb elbo connects to engine there are 2 small hoses ,one on each side, the one on the right was half off, and i noticed a small wet spot below it.. squeegeed the clamp and pushed it on. rode it yesterday and i think that was it,,,,,,,,,, thanks all by the way Fox,, in your avatar video, are you ever gonna get there?? |
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Post by sjfishon on Nov 6, 2015 19:14:05 GMT -5
fox;;;;; i am pretty sure you were right;; hate to say it,, you knw [knock on wood] anyway, you said to check for any leak of air or vacuum.. i thought i did,, but today i noticed the clamp on the front side of carb,, was barley tight,, i looked at my other one and it was tightened all the way to the bottom.. i tightened the clamp, and now i cant kill the engine,, i can rev, full throttle,let off quick and it wont kill,, it used to so i want to say thanks;;;;;;    |
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Post by Fox on Nov 7, 2015 0:21:32 GMT -5
Ahhahh! The old loose carb clamp. Make sure the caburetor is pushd all the way into that rubber boot.
The devil's in the details with these scooters. There are a lot of things that can potentially fail like cheap Chinese rubber that dries out and gets brittle or in your case stops holding onto the nipples. If you have enough length on those lines cut a 1/2 inch off the ends and stick them back on. You may want to get some better quality vac and fuel lines and replace them down the line.
You have to remember that every time you hit a bump in the road the entire engine moves rapidly so everything attached to it takes a jolt. Things will loosen, fall of and even break so frequent inspections are going to save you from getting stranded or having to push it home.
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Post by sjfishon on Nov 7, 2015 12:22:34 GMT -5
oh , buy the way i did put those videos in my favorites;; thanks Brent;; they are great;;;; so the petcock is really not necessary at all. is it a law to have it there;; the next time i am in there i might do the buy pass, and plug the hose at the elbow''
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Post by Fox on Nov 7, 2015 12:52:55 GMT -5
There's no law. It's there so the carb doesn't overflow sending all the gas in the tank onto the ground if the float valve fails. With a manual petcock you have to remember to shut it off and you have to remember to turn it on.
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Deleted
Deleted Member
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Post by Deleted on Nov 7, 2015 12:55:37 GMT -5
If you forget to turn it on...you will know it in a few moments, ha ha. (Been there, done that on one of my motorcycles a long time ago.)
Bill
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Post by sjfishon on Nov 7, 2015 13:46:41 GMT -5
ahh,, if that's the case , if it works ok, i will leave it alone..
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