New Zonger 155's now come with factory 6 disc clutch and Daytona style clutch covers with on board oil filter. Often referred to as 155HO, this powerhouse utilizes Honda CRF engine mounts and KLX style cylinder and head allowing for larger valves than standard CRF based engines. Much like the YX engines but with gearing more suited to mini riding. This engine will bolt in 95% of all current CRF KLX and TTR based pitbikes with Honda engine mounts. Specs:

• 60mm bore, 55mm stroke (155.7cc)
• 2V SOHC Big Valve Head
  
• 28/23mm valves
• 26/21mm ports
• Lightweight 12V Outer Rotor Ignition
• 4spd manual transmission (starts in any gear)
  
• onboard oil cooler ports

Crate engine includes:

• Outer rotor with harness and CDI
• 28mm Intake manifold
• Molkt 28mm Carb