Quote:
Originally Posted by drillpvt
I have moded the stock pipe , Sorry i should have posted that . It is a howit gy6 , next is the 39t sprocket , then Cam upgrade then carb. alot of people have told me the 30 to 32 mil pumper carbs wont do to much with out a better Cam . Never done a cam before so it will be intresting ! but im only doning that on one of the Crossfires ! I am looking for a good used 250cc on craiglist and online to throw into the other one.
|
If I was to go up to the 30/32mm carb I'd go with a 63mm big bore kit, or a stroker crank. The extra fuel/air will be needed for the extra displacement on the stock gy6's the stock carb should be fine with just a re-jet... the cost vs performance gain with just changing the carb out probably wont be that significant without adding more space in the engine for combustion.
The big bore kit's can be found for as low as 80-90 bucks, but you will have to have the crank case machined for any big bore kit over 59mm
The 59mm big bore kit will take you up to about 158cc's over the stock 149 (or 148 in the howhits).
63mm will get you about 180cc's. (I'm sure you may know all of this, but someone who may be looking over this thread may want to know).
just found this...
http://www.**********.com/buggy-tech...ore-stroker/16
big bore kit 59mm...
http://www.ebay.com/itm/157QMJ-GY6-p...#ht_912wt_1396