• A lighter crankshaft, with DLC coating, Tungsten weight and silicone-filled intake passage
• Modified piston and con rod that reduces overall weight
• Newly designed outer head with V-shaped fins for lower CG and more efficient cooling
• Dual-adjustable 21J carburetor for smoother acceleration and better fuel mileage
• A 6.5 mm restrictor is installed; 6 mm and 7 mm restrictors are included.

• Rear Low Friction Back Plate by Maxima

Tech specifications:

• Displacement: 0.213 cu in (3.49 cc)
• Bore: 0.641 in (16.27 mm)
• Stroke: 0.661 in (16.8 mm)
• Practical RPM Range: 4,000-42,000
• Output: 2.65 ps @ 34,000 rpm
• Weight: 12.52 oz (355 g)

All-new 5-port engine.
It features a newly developed piston and 5-port cylinder, crankshaft, crankcase, Specially made to fit on-road GT track. 
The MAXIMA GT 1R has a 7mm carburetor restrictor.

• Rear Low Friction Back Plate by Maxima

Tech specifications:

• Displacement: 3.49 cc
• Bore: 16.08mm
• Stroke: 17.20mm
• Intake ports: 5-port
• Exhaust port: 3-port
• Practical RPM range: 4,000 – 42,000 rpm
• Max. power output: 2.65 ps / 2.61 hp / 34,000 rpm
• Weight: 369Gr.

Features:

• 1/8 on-road racing engine
• STEEL Main-Bearing for better torque.
• New Crankshaft.
• New sleeve/piston(lighter).
• Rear Low Friction Back Plate by Maxima

Specifications
Content: 3.49 cc 
Bore: 16.08mm  
Stroke: 17.20mm  
HP: 2.8 ps / 2.76 hp at 33000 r.p.m.
Practical range: 4000-45000 r.p.m.
Weight: 340g