General Modification Specifications* Class 2 - 250 cc Motorcycle Racing
* Frame 1970 GP 125 Frame 1970 GP 125
* Lengthened by 4 inches Lengthened by 4 inches
* Steering angle altered to 55 degrees Steering angle altered to 55 degrees
* Forks lowered by 4 inches Forks lowered by 4 inches
* Top shell removed replaced with tubular steel section lowered by 2 inches Top shell removed replaced with tubular steel section lowered by 2 inches
* Carbon fibre seat fairing from Aprillia 250 GP motorbike Carbon fiber seat fairing aprilli from 250 GP motorbike
* Cut down carbon fibre leg shields and GP carbon fibre horn casting Cut down carbon fiber leg shields and GP carbon fiber horn casting
* NRG light weight front mudguard NRG light weight front mudguard
Suspension Suspension* Front forks stiffened with 3 inch spacers and shortened springs Front forks stiffened with 3 inch spacers and springs shortened
* Rear shocker replaced with solid bar and lowered to 275 mm Rear shocker replaced with solid bar and lowered to 275 mm
Wheels Wheels
* Front drum brake fully lightened, oil seals removed and using low friction bearings running in Teflon lubricant Front drum brake fully lightened, oil seals and removed using low friction bearings running in Teflon lubricant
* Front rims are standard Lambretta split type Front rims are standard Lambretta split type
* Rear rims are AF wide split type Rear rims are wide split type AF
* Rear hub fully lightened Spanish type running with lightened brake shoes Rear hub fully lightened Spanish type running with lightened brake shoes
Fuel tank Fuel tank* ¼ gallon cylindrical aluminium tank, rubber mounted to prevent fuel frothing and angle mounted for fast drain ¼ gallon cylindrical aluminum tank, rubber mounted to prevent fuel frothing and angle mounted for fast drain
* Fuel tap ¼ inch fast flow methanol type using a one way quick release coupling Fuel tap ¼ inch fast methanol flow type using a one way quick release coupling
* Controls Controls
* Short space ace bars mounted on LD clamp Short space ace bars mounted on clamp LD
* Throttle, Honda motor cross type Throttle, Honda motor cross type
* Gear change, modified MB cast type Gear change, modified MB type cast
* Front brake leaver, Amal light weight type Front brake leaver, Amal light weight type
* Back brake, Shimanno thumb operated paddle Back brake, Shimanno thumb operated paddle
* Rev counter Scitsu 12,000 rpm dial type Rev counter Scitsu 12.000 rpm dial type
Tyres Tires* Front wheel, 350- 10 Continental zippy 1 using up to 45 psi Front wheel, 350 - 10 Continental Zippy 1 using up to 45 psi
* Rear wheel, 110/80 - 10, 100/90-10 or 350 – 10 Continental zippy 1 using up to 35 psi Rear wheel, 110/80 - 10, 100/90-10 or 350 - 10 Continental Zippy 1 using up to 35 psi
Engine* 1963 LI 150 casing 1963 LI 150 casing
* Crank mouth opened up to take aluminium Yamaha barrel, which has been extensively modified by MB Developments Crank mouth opened up to take aluminum barrel Yamaha, which has been extensively modified by MB Developments
* 4 main transfers with two boost ports added by Ralph Saxilby 4 main transfers with two boost ports added by Ralph Saxilby
* Piston ported induction using a 72 mm Wiseco Suzuki TS250 piston lightened by John Floyd Piston ported induction using a 72 mm Wisec Suzuki TS250 piston lightened by John Floyd
* Six stud central plug cylinder head from billet aluminium, running a compression of 13: 1 Six central stud plug cylinder head from billet aluminum, running a compression of 13: 1
* GP crank with full padding using a Rotax conrod with a stroke of 60 mm GP crank with full padding using a Rotax conrod with a stroke of 60 mm
* Carburettor is a Mikuni TMX 35 Carburettor Mikuni TMX is a 35
* Fuel is Sunnoco MO2X rated at 114 octane Sunnoco MO2X fuel is rated at 114 octane
* Ignition stator is a Motorplat internal rotor type set at 42 degrees before TDC with a 2.7 degree advancer box Ignition stator is a Motorplat internal rotor type set at 42 degrees before TDC with a 2.7 degree advancer box
* Gearing is TV200 treated gear box running on 15/46 for the ¼ mile and 17/46 for the flying mile Gearing is TV200 treated gear box running on 15/46 for the ¼ mile and 17/46 for the flying mile
* Clutch is an MB Developments six plate type using Taffspeed extra strong springs Clutch is an MB Developments six plate type using Taffspeed extra strong springs
* Chain is either an 80 or 81 link Regina extra and uses a light weight nylon tensioner Chain is either an 80 or 81 extra link Regina and uses a light weight nylon tensioner
Weight of the bike fully fuelled is 138 lbs Weight of the bike is fully fueled 138 lbs
Power output is estimated between 33 to 36 bhp at the rear wheel Power output is estimated between 33 to 36 bhp at the rear whee
