How to make a windowed piston

[Jaycee604]

You actually need a windowed piston to take full advantage of the reed valve. They work hand in hand. Really no point in having one or the other. Open up any 2 stroke dirtbike and they will have both.

 

[Jaycee604]

You don't need a windowed piston with a reed. You can always go case induction. No need to cut up the piston then. Just the case.

I dont think much of the guys on here are doing case induction anyway. Everyone seems to lean towards reed valve or no reed valve.

 

[Karl Snarl]

You actually need a windowed piston to take full advantage of the reed valve. They work hand in hand. Really no point in having one or the other. Open up any 2 stroke dirtbike and they will have both.

No you do not. If you have case induction a windowed piston is completely and utterly useless.

I dont think much of the guys on here are doing case induction anyway. Everyone seems to lean towards reed valve or no reed valve.

You would need the reed for case induction, just not a windowed piston.

 

[Jaycee604]

No you do not. If you have case induction a windowed piston is completely and utterly useless.

You would need the reed for case induction, just not a windowed piston.

So then why do all performance dirtbikes (honda, kawasaki etc) have a windowed piston along with a reed valve? Why dont they have just one?
I have yet to see someone talk about case induction on here lol

 

[Jaycee604]

No you do not. If you have case induction a windowed piston is completely and utterly useless.

You would need the reed for case induction, just not a windowed piston.

Reed valve works just fine with my windowed piston. Ran like s**t without the window too. Just to see what it would do. Just took apart my brothers kx250 last month and it to had a windowed piston with a reed valve.

 

[Street Ryderz]

So then why do all performance dirtbikes (honda, kawasaki etc) have a windowed piston along with a reed valve? Why dont they have just one?
I have yet to see someone talk about case induction on here lol

They don't use a window piston as it is not necessary just as Karl said!
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[Jaycee604]

They don't use a window piston as it is not necessary just as Karl said!
here's a top quality replacement, for them all and no window needed!

Wiseco Pro Lite Piston Kit Yamaha YZ125 / YZ125X 2005-2022 | 5% ($11.30) Off! - RevZilla

Wiseco's complete top end Pro Lite Piston Kits are offered for nearly every popular application and contain everything you need to complete your rebui…

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https://fortnine.ca/en/wiseco-top-end-kit-standard-bore-pk1665?pk_cid=14215143271&pk_campaign=pla-1433727180202&pk_source=google&pk_medium=paid&pk_content=124431327254&gclid=CjwKCAiA5t-OBhByEiwAhR-hm-m9CAuPPGbTeCBOpddgtmD6f8ug0yZbS2kdVLYhAipIdwRHeZ1kExoCeFoQAvD_BwE

Vertex Piston Kawasaki KX 125

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Vertex Piston - Honda CR125

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Lmao

 

[DAMIEN1307]

I dont think much of the guys on here are doing case induction anyway. Everyone seems to lean towards reed valve or no reed valve.

Lmao

Please remember to "Play Nice" on this thread and topic so i do not need to delete posts and lock the thread.

 

[Freddy Snottgrass]

From what I am reading, with reeds, you either need a windowed piston OR case induction (I assume is a larger case opening or a larger piston opening?).

Am I on the right track?

 

[Karl Snarl]

Reed valve works just fine with my windowed piston. Ran like s*** without the window too. Just to see what it would do. Just took apart my brothers kx250 last month and it to had a windowed piston with a reed valve.

Then it is piston port and no case induction. Not all bikes have a window in the piston. You don't need it when it is case induction. Only when it is piston port. All the reed does it take over the intake duration timing instead of the piston. Allowing you a longer duration, like you get with case induction.