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cylinders ground for yz85 reeds

Started by joseimport, April 03, 2020, 10:17:11 AM

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joseimport

ok guys, i removed enough material off the cylinders to fit the yz85 reeds.

i got the sacer from chuck quenzler

here are some pictures, is this fine just to leave them like that?

or should i smooth the corners so as they are rounder?




1975 cb750k2: ongoing restoration project. http://forums.sohc4.net/index.php/topic,183427.msg2122966.html#msg2122966
1979 rd400g daytona special: started putting it back together. http://www.2strokeworld.net/forum/index.php?topic=71.0
1987 tr200 fatcat: running.

m in sc

id definitely radius them at least. Have you bolted them in and make sure the reed petals will clear when they are wide open not hitting the sides?

joseimport

Quote from: m in sc on April 03, 2020, 10:34:49 AM
id definitely radius them at least. Have you bolted them in and make sure the reed petals will clear when they are wide open not hitting the sides?

check the second picture, this are original yz85 reeds, they have reed stoppers.

i think the vforce ones are the ones that do not have them.

they clear inside, i have to use them with spacers
1975 cb750k2: ongoing restoration project. http://forums.sohc4.net/index.php/topic,183427.msg2122966.html#msg2122966
1979 rd400g daytona special: started putting it back together. http://www.2strokeworld.net/forum/index.php?topic=71.0
1987 tr200 fatcat: running.

m in sc

as long as they clear its good.

id still radius the edges.

1976RD400C

In the center pic it looks like the tip of the V shape is bottomed out in area you machined. Do you have enough clearance there or will the spacer or gaskets move the back a little? Also did you push the petals open to make sure they don't hit on the sides?
'76 RD400 green  '76 RD400 red   '84 RZ350

85RZwade

Nice work. I suspect it's all about clearance for the petals to open fully, but I wouldn't be able to stop myself from smoothing those edges.
I post waayyy too much

EE

2 reasons to go all the way, one your all right it's to keep the reeds from getting torn up on the sides and or sticking open. And two love me or hate me but it's not open to discussion.. there is airflow out of the sides of the reeds..
Most tuners go full width to protect the reeds.. and i would if i were you.. and you may not be worried about the extra airflow but the second point is also true...

pdxjim

Here are my EE modified LC cylinders.

Intakes are cut to fit Vforce 3 v382a YZ85 reedblocks.

Goes without saying, Ed Erlenbach does beautiful work.

Wasting time on 2T forums since the dawn of the internet. '89 TDR250, '13 300xcw, '19 690smcr, '56 Porsche 356A

rodneya

Quote from: pdxjim on April 04, 2020, 04:15:44 PM
Here are my EE modified LC cylinders.

Intakes are cut to fit Vforce 3 v382a YZ85 reedblocks.

Goes without saying, Ed Erlenbach does beautiful work.



That's what I did to my air cooled 350 cylinders for the YZ85 VF3 reeds. Just not quite so neat as that.

85RZwade

Those are beautiful. Kudos to EE and congratulations to proud papa Jim!
I post waayyy too much

1976RD400C

'76 RD400 green  '76 RD400 red   '84 RZ350

joseimport

Quote from: 85RZwade on April 04, 2020, 09:20:46 AM
Nice work. I suspect it's all about clearance for the petals to open fully, but I wouldn't be able to stop myself from smoothing those edges.

yes, they clear the sides by half a milimeter, here you can see the pics.

and this are the reed block spacers from chuck quenzler.

i will radius the sides and post more pictures of the finished cylinders
1975 cb750k2: ongoing restoration project. http://forums.sohc4.net/index.php/topic,183427.msg2122966.html#msg2122966
1979 rd400g daytona special: started putting it back together. http://www.2strokeworld.net/forum/index.php?topic=71.0
1987 tr200 fatcat: running.

SUPERTUNE

Grind, Grind, Grind away....you need more room for the reeds to breathe out the sides of the petals as EE replied!

Chuck



RD machine work, boring, porting, cranks and engine building.


Chuck 'SUPERTUNE' Quenzler III
Team Scream Racing LLC
1920 Sherwood St. STE A
Clearwater, FL. 33765
cqsupertune@tampabay.rr.com

joseimport

Quote from: SUPERTUNE on April 08, 2020, 07:58:53 AM
Grind, Grind, Grind away....you need more room for the reeds to breathe out the sides of the petals as EE replied!

Chuck


OK, with this quarantine and not being able to have a nanny for my 1.5 year old, means i dont have the time i would like for this project, but finally got some time to do this....

it was easier to grind, grind , grind everything away smoothly than how i was doing it before.

here you can see how they ended up.

my last question is:

should i sand it with a 80 grit sand paper to smooth them a little, going side to side not front to back?

or just leave them like that.
1975 cb750k2: ongoing restoration project. http://forums.sohc4.net/index.php/topic,183427.msg2122966.html#msg2122966
1979 rd400g daytona special: started putting it back together. http://www.2strokeworld.net/forum/index.php?topic=71.0
1987 tr200 fatcat: running.

rodneya

Leave it like that. You dont want to make the intake super smooth