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mopedhi
09-24-2013, 01:17 AM
I installed a 70cc big bore kit on my vento zip gt5
when I went to test how fast it is it only went less than 20 mph
the stock engine went 30 mph

teddy554
09-24-2013, 09:25 PM
did you up jet the carb

techie610
09-25-2013, 01:35 AM
If you add a BBK, you probably need to upjet the carb, get a free flow exhaust, and a more open air filter.

mopedhi
09-25-2013, 01:58 AM
where can I buy a jet online for the stock carb?

teddy554
09-25-2013, 10:47 AM
about half way down the page it has a drop down box to pick what size. i suggest to buy a couple different sizes 80 85 http://www.scrappydogscooters.com/50CC_2-STROKE_PARTS.html

mopedhi
09-26-2013, 06:39 AM
Thanks guys

mopedhi
09-26-2013, 06:53 AM
anyone know anything about this mikuni carburetor? it has manual choke
I bought it from someone for 10 bucks
it fits perfectly on the intake manifold of my vento zip gt5
the main jet is different size than the stock carb
http://i611.photobucket.com/albums/tt194/rowenj/photo13_zps9bfacf16.jpg (http://s611.photobucket.com/user/rowenj/media/photo13_zps9bfacf16.jpg.html)

teddy554
09-26-2013, 11:15 AM
the jets look different but i think the threads might fit for a swap or you can buy new one to fit the mikuni carb
http://www.jetsrus.com/a_jets_by_carburetor_type/jets_mikuni_4-042_main_Hex.htm
264

skuttadawg
09-27-2013, 11:55 PM
Here is a jet kit http://www.partsforscooters.com/114-50-Minarelli-Main-Jet-Kit?sc=34&category=133078