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www.vkr-engines.com

Modena Fiera 18-20 Ottobre 2007

VKR K125 A :

design philosophyas function of performance

and reliability

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VKR K125A

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Modena Fiera 18-20 Ottobre 2007

Engine layout Cooling system Lubrication system Auxiliary components layout

Starting system and transmission

PERFORMANCE AND RELIABILITY

MAIN TOPICS

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VKR K125A

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Modena Fiera 18-20 Ottobre 2007

Two stroke engine with 123.89 cc displacement

Bore and stroke 54 x 54.5 mm

5 scavenging ports

Water cooled with built-in water pump

Electric starter

Counterbalancing shaft

Centrifugal dry clutch

Exhaust power-valve

Homologated fixed advance electronic ignition

Maximum working engine speeds: 14000 - 16000 RPM

(imposed by limitator) Indicated specific power 200 - 340 BHP/L

Dry weight 13 Kg

Homologation: CIK-FIA 14/M/15

Homologated categories: KF4 - KF3 - KF2 - KF1

CHARACTERISTICS

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VKR K125A

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Modena Fiera 18-20 Ottobre 2007ENGINE LAYOUT

Rear oriented cylinder

with increased anglebetween scavenging portsand reed-valve housing

6 petals reed-valveoptimized to crankshaftconfiguration

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VKR K125A

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Modena Fiera 18-20 Ottobre 2007ENGINE LAYOUT

Engine to chassis interface aligned with main

bearings and main wall structure

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VKR K125A

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Modena Fiera 18-20 Ottobre 2007ENGINE LAYOUT

Alignment of main bearings to main wallsand engine supports

18mm dia connecting rod pin and

engine main walls location

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VKR K125A

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Modena Fiera 18-20 Ottobre 2007COOLING SYSTEM

Split cooling system betweencrankcase and cylinder

Water pump location

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VKR K125A

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Modena Fiera 18-20 Ottobre 2007COOLING SYSTEM

Water flow control bushings on theinlet of the cylinder and on the outlet

of the crankcase

Water pump driving system with 0.5

pump/crankshaft ratio (plastic impeller)

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LUBRICATION SYSTEM

VKR K125A

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Modena Fiera 18-20 Ottobre 2007

Lubrication pump obtained from water pump driving gears

Circulating oil quantity 30cc

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LUBRICATION SYSTEM

VKR K125A

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Modena Fiera 18-20 Ottobre 2007

Counterbalancing shaft gears

lubrified on gear disengagementside

Lubrication of each bearing

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AUXILIARY COMPONENTS LAYOUT

VKR K125A

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Modena Fiera 18-20 Ottobre 2007

Extractable counterbalancing shaft

Localized high stiffness atcounterbalancing shaft supports

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STARTING SYSTEM AND

TRANSMISSION

VKR K125A

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Modena Fiera 18-20 Ottobre 2007

High power starter motor

Transmission chain on theleft side of the engine

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FIRST RACING SEASON BALANCE:

PERFORMANCES

VKR K125A

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Modena Fiera 18-20 Ottobre 2007

2007 racing activity was mainly focused on the KF3 category due to economicalfactors and of engine development capabilities, obtaining the following mainresults:

Victory at the KF3 Bridgestone Cup Swiss ( Nico Muller )

6th place at the CIK-FIA KF3 European Championship ( Henri Rajala )

6th place at the CIK-FIA KF3 Vicking Trophy ( Kalle Kulmanen )

Pole position at the CIK-FIA KF3 Vicking Trophy pre-final ( Henri Rajala ) 7th place at the KF3 beginning race ( Trofeo Margutti at Parma Nico Muller )

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FIRST RACING SEASON BALANCE:

RELIABILITY

VKR K125A

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Modena Fiera 18-20 Ottobre 2007

From a reliability point of view, we had sustained: No withdrawals due to engine failures (6-8 drivers on a dozen main events towich can be added numerous other participations to minor rilevant racingevents)

Marginal failures of auxiliary systems external to the engine ( i.e. failure ofstarter gear loaded by centrifugal forces, was later found to be out-of-spec)

Constant performance throughout racing events

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SUMMING UP OF THE

ENGINE PECULIARITIES

VKR K125A

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Modena Fiera 18-20 Ottobre 2007

Very high reliability ( we have engines that used more than 200 litersof fuel without any kind of maintenance)

Constant performance level throughout racing events (very good

behaviour of cooling and lubrication systems)

Ease in wich interventions can be performed on main auxiliarycomponents

New CIK-FIA rules interpretation fully compliant (especially applicablefor the inspection of the counterbalancing shaft, wich can be done

quickly and with ease)

Exceptional behaviour of the transmission chain due to the differentkind of applied stresses on the rear axle (LH transmission)

Outstanding high speed performances

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ENGINE PRODUCTION AND

DISTRIBUTION

VKR K125AModena Fiera 18-20 Ottobre 2007

Modena , 18 Ottobre 2007 Produced by Uber Ferraguti

Imagination is more important than knowledge

Knowledge is limited

Imagination encircles the world

The engine is produced and distributed by:

Villa Kart Racing Via 4 novembre 49/bis 10019 Strambino TOItaly

Tel. +39 0125 714042 Fax +39 0125 639946

E-mail: info@vkr-engines.com Website: www.vkr-engines.com