Yamaha RD 500 V4
Aprilia RS 250
Honda RS 250R Honda CBR 250RR
Polaris Scrambler 440
Honda CRR KTM 520 EXC 2001
 
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ARRABIDA MOUNTAIN PASS ONBOARD
REAR & FRONT ONBOARD PERSPECTIVE
ARROW EXHAUSTS ONBOARD @ STREET
LUFO EXHAUSTS REVING
LUFO EXHAUSTS ONBOARD @ STREET
LUFO EXHAUSTS OUTBOARD @ STREET
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Pistons: 2 x WISECO YZ 125 1987 with 1 piston ring
Stroke: Stock (50.6 mm)
Cylinders: Stock
Cylinder heads: Stock
Radiator: Stock
Sparks: NGK B9EGV
Exhaust valves: Stock with different adjustment, now opening fully
Reeds :Stock
Carburetors: Stock Mikunis 34mm, main jet from 140/145 to 160/165
Air Filters: stock airbox modified with holes
Electric part: modified by LUFO with new ignition diagram
Clutch: Stock
Exhaust systems: LUFO side-by-side GP style
Silencers: Honda RS 250R HRC stock
Oil: stock oil pump
Transmission: 13 - 42
Engine maximum rotation in charge: Around 12 800rpm
Losses between Gears (%): - | 51% | 31.58% | 18.18% | 14% | 9.05%
Crankshaft - ConnRod Attack Angle: 76.06º
Linear Piston Movement : 21 meters/second
Number of Explosions per second : 208
Wheels: PVM, 3.5p front and stock rear wheel
Rear Sets: VALTER Moto in gold color
Tires: AVON 120/60/17' front & Michelin 150/60/17' rear
Brakes: BREMBO double 300mm front & rear BREMBO 220mm
Braking system: stainless steal with red terminals.
Suspension: Stock.
Steering Damper: OHLINS.
Frame: Stock.
Swingarm: Stock.
Chain: RK red o'ring 520 chain.
Bodywork: Stock.
Stop light: Stock
 

After the new LUFO custom exhausts side-by-side using ARROW silencers, the engine now revs till 12 500 - 12 800 real rpm in charge and till 13 500 rpm in over rev.
The carburetors were rejeted, now using 160 and 165 gigleurs instead of the stock 140 & 145 respectively because now we don't use any kind of air filters on the stock RS 250 airbox.

We're using a front PVM Alloy forged wheel, which is considerably lighter than the stock BREMBO wheel, the rear wheel changed from the 5.5' PVM wheel to the stock one in order to use a Michelin Soft 150/60x17' tire.

As shown in the table, the Aprilia RS 250 has a good gearbox, not the closest one but still good for road use, which is it's real purpose.

Our objective isn't utopic top speeds in our bikes, we prefer great acceleration and quickness till ~210 km/h.

LUFO modified the electronics in order to get the optimized ignition for his custom exhausts, which were made for a different resonance and engine maximum regime (12500 - 12800) with different measures than the aftermarket exhausts (Jim Lomas, Sugaya, Arrow, TYGA, Jollymoto)

These exhausts were made with LUFO philosophy/doctrine within, but of course, they would require a decent ignition for them.

So, in the table bellow there's the differences between the stock RS 250 ignition and the new values with LUFO modifications. To note that, LUFO used his personal pistol light to check the ignition:

RPM STOCK LUFO
1000
1
1.5
3000
1
1.5
5000
4
5
8000
2
2.5
10000
1
1.5
12000
0.5
1
13000
0
0.7
14000
0
0.7
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