ZTMoto 85 for Phantom 85 V4 PRO - Complete 52mm Bore 2 Stroke Motorized Bicycle Engine

ZTMOTO 85.  The first real two-stroke 85cc engine designed for motorized bikes.  After more than two years of development, this unique new engine has been redesigned to be the most dependable and powerful bicycle engine on the market.

Elevate your cycling experience with the ZTMoto 85 V4 PRO, a high-performance 85cc 2-stroke engine kit designed for motorized bicycles. Engineered for enthusiasts seeking enhanced power, reliability, and a thrilling ride, this kit offers a significant upgrade over previous models.

The split head design of this engine generation allows for upgradeability and addresses the main issue of overheating that plagued earlier iterations.

The cylinder head of the older models was one piece and had cooling fins, which would be ideal for chainsaw configurations but not for motorized bikes.

New 85 v4 PRO Features Include:

52mm Bore, 40mm Stroke – 110cc (Actual U.S. engine displacement: 85cc)

Split cylinder, allowing aftermarket head upgrade and better cooling over single piece head.

CNC aluminum cylinder head, excellent heat dissipation

High performance PHBG 21mm carburetor

CNC short air intake

Ceramic lined cylinder (Significantly improves cylinder durability, reduces friction, lowers operating temps, increases performance)

Pure stainless steel muffler with built-in soundproof cotton, upgrade over standard china exhaust.

Oversized exhaust port

High performance CDI with Yamaha components

Performance magneto

High end allen bolts

Improved gas cap

ZTMOTO 85 v4 PRO Complete Engine Kit Includes:

85cc 2 stroke engine with 2 piece cylinder and head

CNC short air intake

Needle bearing for piston wrist pin

High performance PHBG 21mm carburetor

Angled LD Z8C spark plug

Performance magneto

Stainless steel allen bolts

Four-hole balanced crankshaft

Upgraded bearings / 60% thicker crank case around bearings

Stuffed crank case

Large intake port (40mm bolt hole width)

Intake/exhaust gasket hardness increased

Oversized round exhaust port - 28mm diameter, 60mm stud spacing

40mm crank stroke (more powerful, efficient, and reliable)

Closed window piston

Long rod (89mm)

Larger 8mm x 1.25 engine mount studs

Approximate engine dimensions: 9" x 9" x 5"

Mounting Kit & Accessories Included:

High performance CDI with Yamaha components

Black tear drop gas tank (2L) w/ new fuel cap, fuel valve, fuel filter, and fuel line

415 Heavy duty chain with chain guard

Ball bearing chain tensioner

Ultra quiet muffler (Stainless steel with sound insulation cotton inside)

Throttle assembly w/gooseneck style throttle cable

Twist throttle and cable with matching grip and kill switch

New quick release clutch handle

Large front mount for bicycles that have large down tubes

Available with 44 tooth rear sprocket

Spark plug socket tool and gear removal tool

IMPORTANT (Please read):

1.      In order to create a suitable steal on the intake and stop any air leaks, please do not remove the plastic insert or o-ring that comes with your carburator.

2.      An exhaust strapping kit will be included with every engine kit. Please use this to avoid exhaust snapping at welds alternatively, you can use a JB Weld Metal Strapping Kit.

3.      To prolong the life of these components, it is advised to clean and regrease the clutch arm, bucking bar, and bevel gear every few weeks.

4.      Fuel/Oil Ratio recommend by manufacturer: New Engine (500km or approx 3-5 tanks): 20:1 or 50ml of oil per litre. After Break In: 25:1 or 40ml of oil per litre.

Using a different oil ratio than what is advised may speed up engine wear and cause engine seize. Don't assume the ratios instead, use a two-stroke mixing container to measure the oil. Our engine kits come with a 30-day warranty from the date of delivery. If you use a different oil mix ratio, this warranty will be void.