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Post by pgs on Jun 28, 2013 16:14:28 GMT -5
my friend did a bbk last year on his 50cc gy6, and ran great last year and beginning of this year, now it is starting to run slow only around 25mph, tried cleaning the carb, there was some varnish in the bowl disassembled and soaked in carb cleaner and blew out with compressor, no change thought maybe the cvt nothing wrong there, tried compression test, compression is good, any thoughts on this would be great we are both stumped on this
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Rear wheel drive
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Post by justin010304 on Jun 28, 2013 16:22:21 GMT -5
Valves out of adjustment?
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Post by scootnwinn on Jun 28, 2013 16:47:06 GMT -5
You would think the compression would be low if the valves were tight... How old is the belt? The air filter is clean and clear right?? Spark plug is newish, yes?
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Post by pgs on Jun 28, 2013 16:50:22 GMT -5
had checked the valves they were good, belt is pretty new less than 300 miles air filter is clean, tried new spark plug and didn't change anything
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"In HIS Grip"
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Post by peaceful on Jun 28, 2013 18:19:51 GMT -5
Well an engine only needs 3 things to run, spark, gas, air. All you'e got to do is get them there at the right time..
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Post by geh3333 on Jun 28, 2013 18:57:23 GMT -5
What rpms at 25 mph ?
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Post by pgs on Jun 29, 2013 15:09:33 GMT -5
not sure what the rpms are no tach but it isn't revving very high
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Post by alleyoop on Jun 29, 2013 15:15:45 GMT -5
Check the Variator weights. I am sure it was run hard and the variator may be hanging it up and not allowing the weights to move out.
Alleyoop
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Post by pgs on Jun 29, 2013 15:17:21 GMT -5
we switched out between three different sizes5,6 and 7 gram really didn't make much of a difference
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Post by alleyoop on Jun 29, 2013 15:26:37 GMT -5
At wot does it bog or just run up to around 25mph and that is it. Does the motor make any kind of sounds at wot? How are the RPMS if the motor is not cranking out the rpms I would suspect LOW COMPRESSION. Also check to make sure the throttle cable is actually opening the butterfly all the way.
You can test it by hand turn the Throttle control wheel by hand and hold it wide open and then twist the throttle all the way and then let go holding the wheel if the wheel moves back it is not opening all the way.
I have seen it many times they twist the throttle really hard trying to get more out of it and sometimes the control wheel will move on the screw and or stretch the cable.
Alleyoop
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Post by pgs on Jun 29, 2013 15:49:16 GMT -5
it it sounds like it is bogging at wot, it will rev on center stand though, we had checked compression it is around 160 will check throttle
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..BAD TO THE BONE..