90cc YX 4 speed race engine MINI X RACER

90cc YX 4 speed race engine MINI X RACER

Gears 1-N-2-3-4

Here is a high spec race engine.

Red tag gas flowed head.

E22 race cam 1mm extra lift

Dialled in valve timing

EBC clutch

Full race ignition VMR118 light weight flywheel, coil , wiring, Bolt adjustable CDI.

Taper carb manifold  22mm to 26mm

Molkt 22mm slide 26mm carb now with force air filter

Dynoed in at 30% over stock

Service info

• Engine oil:            10/40 Mineral Oil
• Capacity approx: 725mm
• Valve clearance: 0.10mm inlet 0.12mm exhaust

Specifications:

• Model:                                                        147 FMF
• Type: Single cylinder, horizontal, 4 stoke, air cooling, top cam
• Size (L*W*H) mm* mm* mm:                  477*395*280
• Net weight, kg:                                          22.5               
• max. power (kw/r/min):                             3.4(1±5%)) @ (8000 (1±1.5%)
• max. torque (N.m/r/min):                           4.5(1±5%)) @ (6000 (1±1.5%)
• minimum idling RPM:                               1500(1±10%)
• Minimum fuel consumption g/kW.h:        ≤367  
• Engine Oil consumption, g/kW.h:            ≤8
• Bore, mm:                                                  47mm
• Stroke, mm:                                               49mm

• Compression ratio:                                  8.8:1
• Ignition type:                                             CDI
• Lubricating system:                                  Press splash
• Transmission type:                                   Constant engage, 2 grade, 4 gears
• Clutch type:                                               Semi auto wet multi-plate
• Primary reduction ratio:                           1:3.722

Gear Ratios:

• Gear 1:     1 = 1:3.273
• Gear 2:     2 = 1:1.938
• Gear 3:     3 = 1:1.350
• Gear 4:     4 = 1:1.043