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
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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...
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