ZTMoto Phantom 85 WRAIGHT Startor Engine Kit

Introducing the ZTMOTO Phantom 85 cc engine kit in the WRAIGHT version. The first motorised bicycle kit with a genuine displacement of 85 cc. We are the sole official importer of this model in the Czech Republic. It is sold primarily in the USA, where the engine was originally developed. After two years of development, the engine was launched with the aim of being the most powerful and reliable 2T engine for bicycles.

The ZTMoto Phantom 85 Wraith is a premium engine kit for motorised bicycles – a new generation of high-performance 2T kits, completely redesigned from the V3 version. Wraith is designed for riders who want maximum power, smoother running, better cooling and greater durability. It offers up to 5.54 HP and potential speeds of 50+ MPH (depending on the build, gearing and conditions).

The Evolution of the Phantom — Meet the Wraith

This version delivers not only power but also distinctive styling with signature purple performance components. From the CNC aluminium super-cooling cylinder head to the Dellorto PHBG 21 mm carburettor with a high-flow filter, every part has been selected to perform as aggressively as it looks.

Key engine specifications

• Bore × stroke: 52 mm × 40 mm
• Displacement: True 85 cc
• Connecting rod design: Long Rod 89 mm
• Crankshaft: balanced + stuffed crankcase (filled crankcase)
• Reinforced bottom end: approximately 60 % thicker around the bearings
• Max. power: up to 5.54 HP

Performance features

• Oversized 28 mm exhaust port for maximum flow
• Enlarged intake – 40 mm bolt spacing
• Dellorto PHBG 21 mm – high-performance carburettor
• Premium 2-piece exhaust (exhaust pipe)
• OZ Performance magneto for improved ignition
• No reed valve – simpler flow and tuning

Advanced cooling

• Optimised heat management for sustained high speeds
• Better thermal stability than V3

Reliability and service life

• Balanced crankshaft for smoother running across the rev range
• Upgraded bearings for long-term durability
• High-temperature seals + one-piece cylinder gasket
• Improved clutch pads for better engagement
• Stainless steel fasteners throughout the kit

What the kit includes

• 85 cc 2T engine with a two-piece skirted cylinder
• Needle roller bearing and gudgeon pin
• Complete piston kit including needle roller bearings
• Dellorto PHBG 21 mm carburettor + purple K&N-style metal mesh filter
• LD Z8C spark plug
• Performance OZ Super magneto
• Stainless steel hex socket screws
• Large intake (40 mm bolt spacing)
• Thicker engine mounting studs 8 mm × 1.25
• Engine dimensions (approx.): 9" × 9" × 5"

Mounting kit and accessories

• High-performance CDI with Yamaha components (purple cap, black wire)
• Black teardrop-shaped 2 l fuel tank (cap, fuel tap, filter, transparent purple fuel hose)
• Purple 415 heavy-duty chain + chain guard
• Chain tensioner with ball bearing
• 2-piece stainless steel silencer (muffler)
• Throttle with cable (gooseneck-style throttle cable)
• Twist-grip throttle with grip and kill switch
• Quick-release clutch lever
• Rear sprocket

Recommended fuel-to-oil ratio (2T mixture)

• New engine (< 310 miles / approx. 500 km): 20:1
• After running in: 25:1

Why Wraith?
The Phantom 85 Wraith is built for riders who want maximum power and durability. Every part of the kit is designed with a focus on performance, cooling and precision – the result is a top-class 2T kit for motorised bicycles without compromise.

In this kit, only the cylinder head is coloured. The fuel hose is clear, the air filter is silver and the chain is standard black.