No-Airbox Tune*

145 main jets

Stock needles - 2 x 0.6mm washers per needle

All short intake stacks

Mixture screw set to 1 and ¾ turns out



RAM-Air Tune

122 main jets

Stock needles - 2 x 0.6mm washers per needle

All long intake stacks

Mixture screw set to 1 and ⅞ turns out



K&N® Pod Filter Tune

118 main jets

Stock needles - 3 x .5mm washers per needle

Adjustable needles - 2 x .5mm washers at clip height 5

K&N® Pod Filter per carburetor

Mixture screw set to 2 turns out



Derestricted intake Tune with Full Exhaust

116 main jets

Stock needles - 2 x .5mm washers per needle

Adjustable needles - 2 x .5mm washers at clip height 5

All short intake stacks

Mixture screws set to 2 turns out



Derestricted Intake Tune with bolt on Can

Cyl 1 and 4 116 main jets - Cyl 2 and 3 114 main jets

Stock needles - 2 x .5mm washers per needle

Adjustable needles - 2 x .5mm washers at clip height 5

Stock intake stack lengths

Mixture screws set to 2 turns out

Stock Intake Tune with Bolt on Can

Cyl 1 and 4 114 main jets - Cyl 2 and 3 112 main jets

Stock needles - 2 x .5mm washers per needle

Stock intake stack lengths

Mixture screws set to 2 turns out



Stock Intake Tune

Cyl 1 and 4 110 main jets - Cyl 2 and 3 108 main jets

Stock needles - 2 x .5mm washers per needle

Stock intake stack lengths

Stock mixture screw settings



The following is the manufacturer's settings to fall back onto if all else fails...



Factory Settings

Cyl 1 and 4 105 main jets - Cyl 2 and 3 102 main jets

Stock needles - 1 x .5mm washer per needle

Cyl 1 and 4 short intake stacks - Cyl 2 and 3 long intake stacks

Mixture screw set to 1 and ¾ turns out



The assumptions made here are as follows;



#1 : That a full system comprises of larger diameter headers than stock (MC14, MC17 or even the CB250 Hornet headers) and an efficient collector.

#2 : That a bolt on can, whatever branding is merely a large straight through can with no real baffling as such.



NOTE: These settings are all proven to work with cleaned carbs and new plugs.



* Airboxless tune not Road Legal due to insane induction noise and due to there being no filtration of air, not considered healthy for the engine for road use.



Always more to come...

