To run correctly, 2 cycle engines require a perfect seal in certain areas. Most companies use a gasket to make sure it’s air tight. Sometimes rubber O-rings, aluminum, brass shims or Mylar type paper is used.

You should be able to purchase replacement gaskets from the engines manufacturer. If for some reason they have been discontinued or you are in need of one quickly, you should know how to make one.

Below I will show you the easy way to make the back plate gasket in less than 10 minutes.

First you will need to purchase some gasket paper from your local hobby shop or automotive parts store.

If you want to practice before doing the real one, go to Home Depot and get some paper paint samples. They are think enough to practice on. This is what I am using as an example here. DO NOT I repeat DO NOT USE THIS as gasket material. I am only using it to show you how to make one.


The back plate gasket is one of the most replaced gaskets on your engine. This is the rear cover that seals back of the crankcase. Without a good seal here your engine will have trouble transferring gas from the case to the cylinder. Your idle speed and performance will be impacted. When it’s time to do a cleaning of your engine this gasket most likely will be torn when you disassemble it. Follow the steps below to create a new one.

Start with laying the back plate down on the gasket material and using a pencil or pen trace the part of the circle that goes into the housing. Use a X-acto no.11 blade to cut the circle out very carefully. Make sure you don’t cut the hole to big.

Once this is cut out, insert the back plate into the circle all the way through. Now with a punch, poke a hole into each of the four locations where the mounting screws go. Make sure you support the gasket against the housing to prevent it from ripping when you poke your holes. Now using a drill bit the same size as the mounting screw holes turn it through the holes you just poked out. This will enlarge the hole enough for the screw to go in nicely.

Insert the screw and flip the back plate around and start to trace the out edge of the back plate. The purpose of the screws is the hold the place from spinning as you trace it.

After you trace it remove the back plate a bit to make sure everything was traced. If all is good remove the back plate completely and start with your X-acto blade and cut on the outside of your tracing.

Now that this is done place the gasket back on the back plate and reassemble it on the engine housing. Once that is done you can take your blade and trim any excess off to make it look nice.

Congratulations on making your first gasket.

 materials-for-making-your-own-gaskets tracing-hole
poking-out-screw-holes tracing-outeredge
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