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they may have 47mm big valve heads on hand if you want a 50mm head you have to wait at least a month i called and was gonna get scrappys head first

my hoca head came perfect no flaws and it has bigger valves overall i couldn't be happier and it cost less

different size valves and an egr port that i blocked off www.partsforscooters.com/50cc-GY6-Cylinder-set-169-54_2 i have the hoca head

you can use any 18 -20mm carb and a 92 jet works great for the set up www.ebay.com/itm/221178822377?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 this is a good carb used it for months and get a open air filter 38mm www.ebay.com/itm/261153022404?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 www.power-barn.com/servlet/the-1539/Keihin-99101-dsh-116-dsh-XXX-Main-Jet/Detail 92 jet

depending on how much you are trying to spend you can get a ebay 100cc kit for under 60 bucks or a expensive hoca or naraku kit for 300 the ebay kit does good ive installed several without issue. I used to have the ebay kit also it ran good but not as good as my scrappy 52mm kit with the hoca performance head. If you want hill climbing power get you a 100cc kit, 1500 torque spring and a good belt with dr pulley slider weights i can send you links to the stuff depending on your budget its doable for around 200 bucks

im gonna pull all of it off and run a one nipple manifold and see if it works

that is what i have but i unhooked the hose from the metal box and put a screw in the end of the hose it wouldn't start then i put it back on the egr thing and it fires right up