HOW TO DO AN AIRBOX DELETE
Credit for this goes to Sanjuro62. It is a cut and paste of the original TR post in order to try and retain the old technical content. If anyone knows Sanjuro62, tell this Rucker to come and claim their post!
For everyone that has asked, and everybody that is gonna ask here is a ‘how-to’ on modifying the stock air intake system. This applies to '06 thru '12 Ruckus scooters.
stock setup
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air travels from the stock airbox to the pcv solenoid valve
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the ecu sends a signal to the pcv solenoid valve and allows fresh air into the crankcase
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the crankcase vent located at the top of the engine head sends gaseous fumes back into the air box. the stock snorkel takes these gases along with fresh air from the OEM filter into the carb
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this hose supplies vacuum to the bottom of the carb diaphragm
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this forked hose supplies air to a tiny foam filter at the front of the airbox
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the pair check valve draws air from the foam filter and mixes this air with the exhaust gases
modified setup
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this hose is eliminated and a breather filter (KN RU-3490) is fitted directly onto the pcv solenoid
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this hose remains intact
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this hose remains intact, but is vented to atmosphere*
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this hose is eliminated and a breather filter (KN 62-1320) is fitted directly onto the left side of the carburetor
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this hose is eliminated
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this hose is eliminated and a breather filter (Kijima tiny filter from BSS) is fitted directly onto the pair check valve**
the stock airbox is elminated and a pod filter (KN RC-0790) is placed directly on the snorkel***
*a breather filter can be fitted on the end of this hose if you’re feeling guilty about polluting the environment
**this can be capped off if you are running a '06 or '07 Ruckus
***the flared end portion of the snorkel needs to be cleaned up and trimmed to better accomodate the aftermarket pod filter
(KN RU-3490) fitted directly onto the pcv solenoid valve
this hose takes fresh air from the pcv solenoid valve and sends it to the crankcase
the pcv solenoid hose ends up here
at the front of the engine head and at the top is the crank case vent hose
the crank case vent hose is vented to atmosphere and is pointed down and away from the bike
(KN 62-1320)
Kijima tiny filter from BSS you can substitute another filter on this or cap it off entirely
trim the flare at the end of snorkel a bit so the air filter will fit better.
the finished product with the (KN RC-0790) air filter on the stock snorkel****
****I have a batch of brackets that are being made to support the intake snorkel so your air filter doesn’t get banged up against the swingarm and rear shock. The brackets will be laser cut aluminum with black anodizing.