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The nozzle (or squirter) features two calibrated holes that inject fuel into each venturi. To fix this problem, refuel the scooter and check for leaks in the fuel system and air filter. What If MV Agusta Had Not Lost Its Leadership in 1971? ET How-tos: Adjust Idle Speed for 50cc Mini Dirt Bike P9`;jt+sPZm:wk`WM`{(3-QOz[=`u!}v~pA7e`{lZkgYT94rz.N)nZmmn*cq~zVfk{C75"cpn+'7 oTsmUoY DyY,>Uh!b_;lh-{yUt+UPs[`;hNm`#ZncA@Cq(}9GSz@~{gjlZ[}+-"n:=Os/%v)3S[Q^9bXN kQTw{7ZJVXV[kqh~ULY+mXEk,F7HY,NU@a8|7w@Vvg}}~#m[]74mua~\GGsZ_OteCw;R+w\Zjzvw|U6.gYYe5{}AP;K;][ olMYyRSP-{w9+\#L6np[); R4IB$I)I$I%)J^-fUuGAxwiySpSa7mI"%9572V [ T{_"Q.Hjx.wwsZ[z!>7~r*\>Z5M*vkdMv;5!ek@Z;.k7`?{9?eW79^w+nZi_WlUzhcX>IsOHG ]8aXm#p!YU%cq[dcnM_* Z2=hV3q[~(gwJMa6oIi/J#X/s>.9WPK}mN+/CICMUkAhn&ik$oolnTJ:qOi^ew[KqMq;}Fmv#>ss Vac advance should only add advance at light load part throttle. Whether it is a stock or aftermarket carburetor, you will need to consider the temperature, altitude and humidity as these can have an effect on how well it is set up. To achieve an accurate adjustment the engine must be at normal operating temperature. If you give it 1/3 to almost 1/2 throttle it runs down the road good, even manages 25-28 mph. This means that you can adjust the air/fuel mixture to achieve the desired power and performance. There are a few reasons why your 50cc scooter might not be able to take off when you give it gas. The stock replacement diaphragm works extremely well in most cases, but for older carburetors that are only occasionally used and then left unattended for months, weve seen the black diaphragm become brittle. This could be due to an empty fuel tank, worn out piston rings, or a clogged air filter. Otherwise the shot begins before the butterflies are open enough and causes a momentary lag in performance. Clean any areas that are blocked and replace any parts that need attention. The pump adjustment should be at 0 lash with throttle at idle position. This occurs because atmospheric pressure in the float bowl pushes fuel toward the low pressure area in the boosters. Because timing of the fuel is crucial, the fuel needs to be injected as soon as the throttle begins to open. After that, tune the idle jet, needle jets, main jet, throttle slide, and check snap response. When properly adjusted, there will be no hesitation or stumble when the throttle is opened. PM kz1000st; kz1000st's Posts; kz1000st's Threads; Moderator . Steps to clean the carburetor. Coolest Sportbikes of the 90s: Harley-Davidson VR1000, Single-cylinder Triumphs To Be Launched in June, CFMoto Working on Girder Fork for Next Big Tourer, Harley-Davidson Teases All-New 2023 CVO Street Glide, Can-Am Supports This Years International Female Ride Day.