The new, super efficient, disk brakes also work much better then the old drum brakes. I am 70 this year, "New" and "Modern" two strokes seem to be few and far between these days. Yeah, I know, "New" and "Modern" don't rightly mean the same thing in 2020 as they did in 1998. This keeps the compression pressure at slow, kickstarting speeds quite low but once the engine gets revving things really pick up and high horse power is achieved through high engine RPM and the unique port design of the two stroke engine. This is because the modern two stroke has absolutely gigantic ports and Power Valves. Some, like this Victor Compression Release, are specially designed to ease starting AND be an engine brake.Īll this talk about two stroke compression releases and engine brakes is not real relevant to the new two strokes we have today. ![]() If you did not have the right design, the engine could draw in dirt and the hot engine gases could weaken the decompresser spring. By putting in the right kind of compression release the engine would act as an engine brake if activated when the engine was running. This was all the rage in the late 1960s and early to mid 1970s. The compression release can be used for something else on two stroke engines. We Modified existing Compression Releases too. Back in the days of Yore, This was quite common. You can put a compression release in the extra hole. Some 1960s and 70s two stroke engine heads have two spark plug holes. You could also make it fit other big two strokes that didn't have compression releases by cutting some fins out of the way and drilling and tapping a hole in the cylinder. Yamaha DT360-400 singles used this type of compression release. The further away it is from the cylinder head the higher the compression. ![]() The closer to the cylinder head the hole is the less compression there will be. This cuts the compression in direct relation to where the port is in the cylinder. When the compression release is in the cylinder it will release the pressure in the cylinder until the piston covers the port hole in the cylinder. You will notice that the two stroke can use a compression release in the cylinder OR the cylinder head. A lever on the handlebar, connected by a cable, to an exhaust valve screwed into the cylinder.A cable connected to an exhaust valve on the cylinder, that is automatically operated by a cam on the kickstarter. ![]()
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