Hollow sound after upgrades, pretty sure its the carb

linkkokiri83 · 08-06-2016, 06:46 PM

Okay i have a 50 cc smm jazzie , pretty standard chinese scooter, recently had a 100cc kit (professianly installed).

Afterwords i have installed:
Performance cdi cable (black and orange), performance cdi box (blue/purple box), the small airfilter that pops onto the back of the carb, 20mm carb (jet sizes unknown as of now). New variator amd weights (gram weight unknown as of now). Pretty much the standard upgrades.

The scooter runs solid, no hesitations or sputters, held a steady 40 mph (keep in mind im 6 foot, 270 pounds) . the ride does have a louder, but more hollow sound. Im pretty sure its the carb now , needs adjustment amd possibly a different jet set. Ill update as i cam find more about it.

blueboy5000 · 08-07-2016, 06:12 AM

The "hollow sound" is "intake roar", it's the result of an open-element air filter.

This noise increase is normal, and in some cases, preferable to stock sound.

linkkokiri83 · 08-07-2016, 12:37 PM

Still lacks power in high. Seems its running beautiful at low rpm, but its like when it gooes to the main jet, its lacking push. Pretty sure id need to change the llarge jet, but dont know what to get. Idle is great as well. Does seem.its getting more air tham gas in high.

blueboy5000 · 08-07-2016, 01:05 PM

Raise the declaration needle ( move clip one slot down) then reset mixture.

linkkokiri83 · 08-07-2016, 01:40 PM

Is there a video tutorial on "reset mixture"? Im new to this xD

08-07-2016, 06:12 AM	#2
blueboy5000 Join Date: Jul 2011 Location: Connecticut Posts: 493	The "hollow sound" is "intake roar", it's the result of an open-element air filter. This noise increase is normal, and in some cases, preferable to stock sound. __________________ 2011 Roketa MC-23-150 4T 150cc 157 qmj 24mm carb w 115 main jet and paper cone air filter Manual petcock w Tygon fuel lines Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust RED spring clutch Adjustable CDI (brand unknown, it's blue and red and works great!) KOSO high performance variator w 12g sliders Gates Powerlink 835-20-30 belt GPS verified 65mph on flats.
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08-07-2016, 01:05 PM	#4
blueboy5000 Join Date: Jul 2011 Location: Connecticut Posts: 493	Raise the declaration needle ( move clip one slot down) then reset mixture. __________________ 2011 Roketa MC-23-150 4T 150cc 157 qmj 24mm carb w 115 main jet and paper cone air filter Manual petcock w Tygon fuel lines Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust RED spring clutch Adjustable CDI (brand unknown, it's blue and red and works great!) KOSO high performance variator w 12g sliders Gates Powerlink 835-20-30 belt GPS verified 65mph on flats.
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