Would adding a reed and windowed piston do much on a ported motor? (zeda 80)

[extremeodd]

I probably should get my hands on a Dremel (or whatever), some carbide bits, a degree wheel, some jugs and start to figure out port tuning. Or at the very least make the closest thing to a replica of my current ZMS jug. Had the head off last night replacing the aluminum gasket with a BBR copper version and noticed a ~1mm dot of chrome that came off about 1/4in from the deck and I'm not willing to pay the price ZMS charges for just the ported jug. However, southern AZ is hot as hell and working in the garage this time of year sucks ass so I'm going to put that off until the end of August and just hope the jug lasts until then.

it should have some bridges on the transfer ports or the rings are going to go inside the transfer ports one day i seen the damage that jug design does many times

With having the transfer ports wide open like that, wouldn't giving the top edge of it a slight ramp vs a sharp edge help mitigate that issue? To do it without badly affecting the timing it would either have to be a very minor ramp or material would need to be added to make the ramp end at the same height the unramped one did. I'll have to play around with that once I get some tools and whatnot.

I'm using the 21mm and a reed setup. Its more than enough.it definately makes the bike more responsive. Runs and drives like a regular motorbike now. I'm with ya I enjoy working on these too. I'm a mechanic and fix cars all day and hate every minute of it. Fixing people's s**tboxes sucks the enjoyment of cars right out of you. I can fix anything on my bike with a handful of tools I can fit into my pocket and not $50+ thousand I have in tools at work in ginormous toolbox. And if it breaks I can carry the engine down into my basement with one hand. A small block Chevy not so much lol. And it's affordable that's the best part. Warp an aluminum big block chevy head and your into thousands of dollars. Warp a China girl head and your out 15 bucks.

That is motivating to hear about the reed setup!

 

[GreasyChris]

That is motivating to hear about the reed setup!
[/QUOTE]

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This is the reed im using. 4 petal reed valve, it's pretty big and is made for the 21mm oko to fit right on

 

[Spare_Parts]

That is motivating to hear about the reed setup!

BGF 80cc 32mm 40mm PERFORMANCE Tuning REED valve INTAKE for 2 stroke motor bike for sale | eBay

Find great deals on eBay for BGF 80cc 32mm 40mm PERFORMANCE Tuning REED valve INTAKE for 2 stroke motor bike. Shop with confidence.

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This is the reed im using. 4 petal reed valve, it's pretty big and is made for the 21mm oko to fit right on
[/QUOTE]
And BGF is a good company to deal with.

 

[extremeodd]

I was looking at that reed or maybe the CDH with 23mm intake. My only concern with having a 32mm intake is fitting on my 1in (25mm) heater hose intake runner, it can stretch but I'm not sure how much. But then again, I see that style reed used more often than any other on the higher power builds. My 21mm PHBG racing clone has a 25.3mm spigot outlet for reference.

 

[extremeodd]

Ah s**t.

 

[GreasyChris]

That's s**tty. I had something similar last weekend. I had a broken circlip do that

 

[Spare_Parts]

That sucks. Going to have to do a full rebuild. Don't understand why the cylinder is notched under the transfers. Looks like too much material was removed from the cylinder wall side of the transfers.

 

[GreasyChris]

Bgf 32mm reed valve with 21mm oko carb.

 

[extremeodd]

Spent another 30 mins pulling it apart before the heat drove me in. The transfer walls look fairly thick, it seems that it was just the force of the ring catching that jacked it up. Apologies for the craptastic focus in the pictures, my damned pixel 3 xls camera decided to fail. Your spot on with the full rebuild, some crap got into the crank and it won't fully rotate freely. It catches near the 180-degree position.

 

[Lukesky36]

Razor edges will do that round them out really good next time so the rings will ramp up into the piston seat instead of ramming flat into the side of your jug. Don't worry about dropping your transfers as much as widening them more grinding toward your intake side and just widen your exhaust and it should be solid if you want some more simple fuel/air flow i done it a few weeks ago works great i copied the work that cr machine does with his exhaust port