ported cylinders

[Rattlehead]

I just got my cylinders back from Trinity. They say you should port match the case as well. My question is what to match? I have the whole motor apart and am looking at it but really don't understand where to cut. Can anyone give me some pointers? I like to do what I can myself. Thanks for the help. I can provide some pics if it would help.

[Rattlehead]

Never mind, just set the base gasket on the top crank case and you can plainly see what has to be removed. Usually soon as I post a question I end up figuring it out. Oh well. Thanks anyway.

[BdBanshee]

You got it. Usually you have to trim the gasket to match the transfers on the bottom of the cylinders, and then lay it on the case and match the case to the cylinders.

 

Real simple if the cases are split!

[Machwon]

I like to case match with the cylinders bolted on the top crankcase half with the gaskets in between. Just my preference but does make it a little easier to trim the gaskets down.

[fastbanshee4u]

I just got my cylinders back from Trinity. They say you should port match the case as well. My question is what to match? I have the whole motor apart and am looking at it but really don't understand where to cut. Can anyone give me some pointers? I like to do what I can myself. Thanks for the help. I can provide some pics if it would help.

348608[/snapback]

This will help for wide open rpms. heres what to do. Turn your cylinders upside down,and put a light coating of grease where the base gasket goes. Now put the cyliders on the case and tap down tight. Now remove cylinders and you will see how the case needs to be ground back to match the jugs. Grind on a angle towards the rod ,not straight up and down. you should tear the engine apart to keep metal shavings out of the crank. The little holes, 4 of them are where the premixed gas lubricates the crank bearings. So dont let no dirt in them. Have fun.

[fastbanshee4u]

You also will need to match your gaskets,or buy one from twister crankshaft that is aready stamped for this.

[locogato11283]

you can also do the inside of the crank case but u would prolly need pictures to see what im talking about. im assuming it helps with airflow.

[MonkeyBoy]

you can also do the inside of the crank case but u would prolly need pictures to see what im talking about. im assuming it helps with airflow.

349159[/snapback]

 

I wouldn't do that unless you know what you are doing. Crankcase volume directly effects port volume and suspension of fuel in a two stroke. You can kill your motor looking for power that isn't there.