ZTMoto Phantom 85 - Complete 52mm Bore 2 Stroke Motorized Bicycle Engine Kit - True 85cc Bike Motor - 36T Sprocket

ZTMoto Phantom 85 - Complete 52mm Bore 2 Stroke Motorized Bicycle Engine Kit - True 85cc Bike Motor - 36T Sprocket

(19 reviews) Write a Review
$319.99 $299.99
{You save $20.00)
27.00 LBS
Assembly Instructions

Back in stock! All kits will include the new needle bearing.

Introducing the ZTMOTO Phantom 85. The first true 85cc 2 stroke engine built for motorized bicycling. More than 2 years in the making this exclusive new engine has been redesigned to be the most powerful and reliable bicycle engine available.

The Phantom boasts a 52mm bore, redesigned, single piece cylinder combined with a 40mm stroke that makes this the biggest, fastest, most powerful bike engine you can buy. The bike engine kit comes standard with an upgraded CDI, the latest performance Speed carb, a reed valve, a double window piston, and a brand new class of high-end exhaust.

Testing has shown the ZTMoto 85 to deliver well over 3 HP. More powerful than the so called 100’s, faster than the Dio’s, the Phantom delivers high end performance right out of the box.

We also know that along with performance motorized bike riders demand durability. That’s why we made sure to include a ceramic coating on the inside of all the Phantom cylinders. This process, often seen in the racing industry, extends the life of the cylinder, reduces friction and heat, and helps improve overall engine performance.

New Phantom 85 Features Include:

  • 52mm Bore, 40mm Stroke - Actual U.S. engine displacement: 85cc
  • Single piece cylinder and head (Lower operating temps, increased rider weight capacity, improved power output across varied rpm range)
  • High performance Speed carb
  • Reed Valve (Controls air-fuel mixture flow to increase performance)
  • Ceramic lined cylinder (Significantly improves cylinder durability, reduces friction, lowers operating temps, increases performance)
  • All new ultra-quiet exhaust pipe
  • Oversized exhaust port
  • High performance CDI with Yamaha components
  • Performance magneto
  • High end allen bolts
  • Improved gas cap

ZTMOTO Phantom 85 Complete Engine Kit Includes:

  • 85cc 2 stroke engine with one piece cylinder and head
  • Reed valve air intake
  • Needle bearing for piston wrist pin
  • High performance Speed carb
  • Angled LD Z8C spark plug
  • Performance magneto
  • Stainless steel allen bolts
  • Better balanced crank
  • Upgraded bearings / 60% thicker crank case around bearings
  • Stuffed crank case
  • Large intake port (40mm bolt hole width)
  • Oversized round exhaust port - 28mm diameter, 60mm stud spacing
  • 40mm crank stroke (more powerful, efficient, and reliable)
  • Double 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 36, 44, or 48 tooth rear sprocket
  • Spark plug socket tool and gear removal tool

Fuel/Oil Ratio

  • New Engine (<310 miles): 20:1
  • After Break In: 25:1

All Phantom 85 kits now include needle bearings as a standard option. If you own an older version that uses a bushing and wish to perform an advanced custom modification to replace the bushing with a needle bearing, then please see this blog post by Alexander Nave:

Installation: ZTMoto Phantom 85 Installation Instructions | Cylinder Assembly Instructions | Cylinder Assembly Video
Troubleshooting: 2-Stroke Troubleshooting Guide

Write a Review

19 Reviews Hide Reviews Show Reviews

  • Still 5 stars

    Posted by Matthew Maines on Mar 17th 2022

    I still give them a five star rating even though 3 parts was missing awesome customer service and will be purchasing from bicycle engines. Com for my next kit or parts need thanks team the our working at bicycle engines

  • Successful Maiden &amp; Shakedown Runs

    Posted by Michael on Mar 16th 2022

    Despite the uncertainty of new bronze bushing durability I ordered this kit, Finished frame up build last night; Ran couple heat cycles &amp; shakedown runs so far, so good! Excited to lean out fuel mix &amp; needle setting after first couple tanks of gas; wonder how it will run @ 40:1 !!

  • Phantom 85

    Posted by Kerry Minter on Mar 2nd 2022

    So far I&#039;m well spent ..already thinking about buying 1 be cont...

  • Phantom 85

    Posted by Harry Miller on Feb 24th 2022

    Powerful engine, destroyed rear hub in 3 days. Even though I have heard that could have been not enough grease from factory. Huffy cranbrook. Pretty easy installation, vert little cleaning up of casting. Only one issue. The carb, leaked very bad. Upon inspection. The flange that holds gasket in place us very thin. A peace about 1 inch crackwd off on straight part of it and a small piece in the corner. Very thin casting around the bowl. Other then that very pleased with the rest of the kit

  • Phantom 85

    Posted by Nick martiji on Feb 21st 2022

    Great working engine. Love it! Would really like to see a conversion kit for my yd100. I would buy that asap!

  • performance out the box

    Posted by Horace Kelly on Feb 14th 2022

    The phantom 85 is a very good motorized bicycle engine kit. It&#039;s performance is outstanding right out of the box. Anyone buying this kit will be throughly satisfied. There customer service is great and they back what they sell. In a nut shell you can&#039;t ask for nothing better in its price range

  • Phantom 85

    Posted by Judson H Clanton on Dec 25th 2021

    Absolutely love the kit, and love the customer service. I bought a gen 1 kit, with faulty wrist pin bushing, they got me fixed up up quick with the right stuff, and man this thing is powerful! Order it with the 36 tooth sprocket only. Any other will lay you on your back. Would buy again. Thank you!

  • Phantom 85

    Posted by Gerald hartman on Oct 29th 2021

    Ran great at first Had a Lot of Power but the second week I ran it the wristband shattered and cracked the piston and the motor locked up

  • Phantom 85

    Posted by Robert Black on Sep 29th 2021

    I LOVE THE ENGINE! It definitely is night and day different than my 66cc engine. I am a ex pro Motocross guy so I can only compare it to riding a 125 and then jumping on my 250 it actually has bottom end LOL which is great.
    But if I can only keep it together I love the engine just be gentle on them unless you get the wrist pin fixed

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