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02-03-2013, 04:17 PM
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#1 |
 
Join Date: Oct 2012
Location: Germany
Posts: 140
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Smallest SAFE main jet size (50cc)
Hi, in winter my MPG decreases with up to 10 miles. In summer I get 96 MPG, in snow and ice I get 86-88. Running a #75 mj now and I want to decrease it even more. So what do you recommend as the smallest yet SAFE size for a stock 50cc with a free flow filter? I don't want to run it too lean.
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50cc 139QMB, 7g sliders, manual petcock w/ transparent lines, Naraku CDI, Naraku belt, high output racing coil, 18.4mm CVK clone w/ #85 mj and #38 idle, needle @ leanest, OEM pipe mod, Kenda tires, NGK Iridium, lots of LED mods, 2.61L/100km (90 MPG) |
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02-03-2013, 10:03 PM
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#2 |
 Join Date: Apr 2012
Posts: 11
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In my opinion I would keep #75 in summer since u get 96 mpg. In the winter I'd say try a #70.. Since engine will b at cooler temps in winter u can run it a lol hotter.. Try puttin in a #70 take a long ride with it, then pull plug to see if too lean or not, then go from there.. Just make sure when summer comes around u put the #75 back in so u dont burn up engine... Personally I would never go lower then #70
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02-03-2013, 10:52 PM
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#4 |
Join Date: May 2012
Location: missouri
Posts: 164
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you need a bigger jet or adust to more rich on the a/f screw in the winter the cold air is more dense.
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B.A.M.F. tapout scoot 24mm carb 150cc intake performance exhaust A9 cam hoca big valve head 16/50 gears 9.25 gram dr pulley sliders koso variator 1.5k torque spring orange coil orange unlimted cdi uni filter gates premium belt 2012 taotao vip cy50a scrappys 110cc big bore kit 52mm "88cc" 100 main jet 38 idle iridium plug custom paint, leds and decals alarm system naraku hd crankshaft |
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02-03-2013, 11:48 PM
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#5 |
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Join Date: Jul 2012
Location: Miami, FL
Posts: 389
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that would negate what he is trying to accomplish, namely the same fuel economy.
What you say is true, however, if he likes to go on the edge with his bike, in getting the best fuel economy possible, then enlarging the jet would do the opposite he's trying to achieve,. |
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02-04-2013, 12:44 AM
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#6 |
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Join Date: Oct 2012
Location: Germany
Posts: 140
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Thanks guys, I will just stick to #75 then. I guess higher fuel consumption in winter is a normal thing.
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50cc 139QMB, 7g sliders, manual petcock w/ transparent lines, Naraku CDI, Naraku belt, high output racing coil, 18.4mm CVK clone w/ #85 mj and #38 idle, needle @ leanest, OEM pipe mod, Kenda tires, NGK Iridium, lots of LED mods, 2.61L/100km (90 MPG) |
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