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Post by windhill on May 16, 2012 15:50:46 GMT -5
Please anyone help fitted 80cc cylinder and head (original valves) up jetted to 90.Starts fine runs well till gets warm then misfires a little and will not develop power (was better as 50cc no alteration to air intake ,exhaust drilled with 2 x 5/16 holes think CDI restriction cut (green wire) DESPERATE
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Post by windhill on May 16, 2012 15:52:02 GMT -5
Sorry QMB139 engine original 50cc
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Post by skuttadawg on May 16, 2012 15:56:08 GMT -5
Raise the needle if you can or get a new carb as they are only 35 and up
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Post by wile on May 16, 2012 16:15:25 GMT -5
Its running to RICH, the 90 is to big. You can try LOWERING the needle to take some of the gas away.
Wile
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Post by ltdhpp on May 16, 2012 17:19:12 GMT -5
Don't you need a bigger carb for a BBK to run right?
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Post by windhill on May 16, 2012 18:28:31 GMT -5
thanks you guys ,will drop the needle or jet change what size you suggest
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Post by wile on May 16, 2012 19:51:43 GMT -5
Don't you need a bigger carb for a BBK to run right? Nope, thats the mistake every young pup does is buy a bigger carb and FLOOD THE sh!t out of it. You can 99.9 percent of the time just upjet the carb you have and it will be more than enough. Same mistakes they make with jetting they put in Pilot jets and main jets that a 150cc 24mm carb has on their little 50cc built up to a 72cc or what not and they are really looseing power. Wile |
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