Big Bore 7 Tuning Kit - Gold

THE LATEST AND MOST POWERFUL MODEL ON THE MARKET
Big Bore EVO 7
BB7 delivers an extra 1.5 HP compared with the Big Bore 5 kit
Completely redesigned for optimum performance in 47-49 cc engines.
Suitable for minibikes, mini dirt bikes, mini quads and mini supermotos!
4-piece cooling assembly, even higher compression
Increases engine capacity from the standard 40 cc to 49 cc!
Redesigned piston
The separate cylinder head offers improved cooling and makes engine tuning easier.
Gudgeon pin diameter increased to 12 mm. Piston diameter 44 mm. Full-circle crankshaft = improved cylinder filling. Five transfer ports.
The kit includes:
full-circle crankshaft with reinforced gudgeon pin,
piston with rings,
cylinder and cylinder head,
complete gasket set,
spark plug

Technical specifications:

• Increases engine speed from 8500 rpm with the original cylinder to approximately 17500 rpm.
• The crankshaft has been reinforced.
• Manufacturer-stated power output of up to 10HP when combined with other components.
• When combined with a performance exhaust and carburettor, engine power increases by more than 100%!