These instructions are intended to be followed by an experienced mechanic whom has a thorough knowledge of off road motorcycles, carburetor assembly, and tuning techniques. If this does not describe you please stop and seek professional help as engine damage and serious injury can result from improperly assembled and tuned carburetors. Do not attempt to…
Category: Troubleshooting
2-Stroke Detonation – What is it? How to prevent it?
Another great article on detonation and how to prevent it from Millennium Tehchnologies. The most common mode of failure for 2-stroke engines is detonation. We asked 3 time AMA pro mechanic of the year, multiple SX/MX championship winning crew chief, and Millennium Technologies Technical Manager, Tom Morgan to put together brief guide on two stroke…
Two-stroke piston troubleshooting
These three pistons have piston-crown burn patterns linked to carb jetting and fuel choice. The piston in the center is a great example of a perfect carbon pattern; the color looks like hot-chocolate and the flow pattern resembles a leaf pattern. Looking under the piston crown a dark carbon spot should be visible taking up…
Causes of detonation
Detonation — generally caused by fuel with a low octane rating — is the tendency for the fuel to pre-ignite or auto-ignite in an engine’s combustion chamber. This early (before the spark plug fires) ignition of fuel creates a shock wave throughout the cylinder as the burning and expanding fuel-air mixture collides with the piston…
Two-stroke engine troubleshooting guide
If you are having trouble starting your twostroker then here are a few tips and tricks for you to get your engine started again. First and foremost – two stroke engines are very easy to start (yes even when they are cold) so if the engine does not start after a few kicks or pulls…