the bike - its a standard beach cruiser i bought from sports athurity, single speed rear hub brakes. orange and black.
the motor - standard grubee gt5 kit
well when i got my kit in the mail i was unhappy with the quality it seemed verry cheap and the ports were horrible!!!!! the carb looked good but the exhaust was a huge hunk of heaving useless steel and the gas tank had crud in it. all the fins on the motor looked like they were cast by a someone who clearly did not care, in fact i never saw a motor in my life with sutch low standards, i swear i thought i got ripped off and that it would not run or well at least barly run.
and i was right !!!! i did not want to run this thing stock as is.. i realy didnt ... but i got impatiant waiting for my bike to arive and adhd kiked in and i bolted it up as per the provided directions to a crap bike i had out back. first let me say that whoever invented this rear sprocket mount syst needs a good punch in the face lol !!! its way too over complicated. the amount of time it takes to bolt all tenthousand bolts rubber pads and half moon brackets to the spolks off all places could have been spent machining a 2 peice aluminum hub adapter... they should just come with one who wants an engine turqeing there spokes anyway ?
well first of i ran a 44t rear on a 26inch mountain bike as a tester bike and was sorly disapointed. it had no power no throtle responce and smoked at 16:1 ... i mean 16:1 realy ? who on earth recomends that ? do they run used tractor oil in there 2 strokes in china ? i never heard of a mixture so lean ! to put it bluntly i was not impressed and had to pedal a lot to help the motor it could not even tackle a small hill. figuring i wasted my money any way i tore it apart and began moding it my way like i should have from the begining i mean what was i thinking ? i am a great mechanic who has restored many motorcycles dirt bikes atv's and my baby girl.... an frame up resto of a 1982 honda big red 200es !
i did what i could with it before i found this forum and all the sweet upgrade parts available. i do however think i did a great job with the stock motor and no real high end mods as you will see.
1- i decked the head down .1 the compresion was like 6:1 way to low for me so i took a lot off. then polished the chamber
2- i ported the jug like crazy taking a lot off the bottom of the intake and top of the exhaust also made them wider and rounder and cleaned up the transfer ports. i noticed the piston sat a little to far into the jug so i decked that down about .05
3- the piston a lot of work was done to it ... i saw at tdc it covered a lot of the intake and it was heavy so i just strait up cut a full 1/4 inch off the intake side of the piston and then saw that the transfer ports were partialy covered by it and the intake port was also blocked by it AGAIN ! at bdc !!! WOW poor design . so i cut ramps into the piston in the shape of a 4 leaf clover patern in the top of the piston matching all the ramps to the corrosponding ports
the motor - standard grubee gt5 kit
well when i got my kit in the mail i was unhappy with the quality it seemed verry cheap and the ports were horrible!!!!! the carb looked good but the exhaust was a huge hunk of heaving useless steel and the gas tank had crud in it. all the fins on the motor looked like they were cast by a someone who clearly did not care, in fact i never saw a motor in my life with sutch low standards, i swear i thought i got ripped off and that it would not run or well at least barly run.
and i was right !!!! i did not want to run this thing stock as is.. i realy didnt ... but i got impatiant waiting for my bike to arive and adhd kiked in and i bolted it up as per the provided directions to a crap bike i had out back. first let me say that whoever invented this rear sprocket mount syst needs a good punch in the face lol !!! its way too over complicated. the amount of time it takes to bolt all tenthousand bolts rubber pads and half moon brackets to the spolks off all places could have been spent machining a 2 peice aluminum hub adapter... they should just come with one who wants an engine turqeing there spokes anyway ?
well first of i ran a 44t rear on a 26inch mountain bike as a tester bike and was sorly disapointed. it had no power no throtle responce and smoked at 16:1 ... i mean 16:1 realy ? who on earth recomends that ? do they run used tractor oil in there 2 strokes in china ? i never heard of a mixture so lean ! to put it bluntly i was not impressed and had to pedal a lot to help the motor it could not even tackle a small hill. figuring i wasted my money any way i tore it apart and began moding it my way like i should have from the begining i mean what was i thinking ? i am a great mechanic who has restored many motorcycles dirt bikes atv's and my baby girl.... an frame up resto of a 1982 honda big red 200es !
i did what i could with it before i found this forum and all the sweet upgrade parts available. i do however think i did a great job with the stock motor and no real high end mods as you will see.
1- i decked the head down .1 the compresion was like 6:1 way to low for me so i took a lot off. then polished the chamber
2- i ported the jug like crazy taking a lot off the bottom of the intake and top of the exhaust also made them wider and rounder and cleaned up the transfer ports. i noticed the piston sat a little to far into the jug so i decked that down about .05
3- the piston a lot of work was done to it ... i saw at tdc it covered a lot of the intake and it was heavy so i just strait up cut a full 1/4 inch off the intake side of the piston and then saw that the transfer ports were partialy covered by it and the intake port was also blocked by it AGAIN ! at bdc !!! WOW poor design . so i cut ramps into the piston in the shape of a 4 leaf clover patern in the top of the piston matching all the ramps to the corrosponding ports
