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…
Carburettor tuning
Understanding Carburetion Motorcycle carburetion is fairly complex, but a basic understanding of the parts and theory involved will go a long way to simplify the processes and make fine-tuning your carburetor much less intimidating. Right off the bat I’m going to say this is only intended to be a very basic explanation.
Tuning engine for the low and mid end bhp.
So you have your engine which is top notch, but you feel that the power curve is very narrow and the feel of the bike is very abrupt. If you are in the ATV motocross (all those Apex PRO MXR and DRR 50cc, 70cc and 90cc engines) then you definitely have room for improvement for…
Carburetor adjustment procedure and jetting
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…
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 tuning books
The bible of any two stroke engine tuner is Gordon Jennings Two Stroke Tuners Handbook.
About me
My son has been competing in ATV motocross since 2009. We started off with an 50cc Apex ATV.