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alteration of intake port on RD350 cylinder

Started by Still biking, December 20, 2020, 04:57:48 PM

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Still biking

Check the alterations on the intake port on these cylinders on Ebay.  Also, cut out above intake of cooling fins.  Any Ideas why this was done and if it improves performance?  see https://www.ebay.com/itm/333830105894?ViewItem=&item=333830105894

Seizer

Maybe they relief cut the fins to fit in a different frame?

bitzz

My guess would be it was modified to accept a balance tube intake like a RD400 or RZ.
The way the port is hogged out probably a RZ or Banshee intake.

SoCal250

Looks like he was running them with the tabs still on the piston skirts.
75 Yamaha RD125B   75 Yamaha RD125B (project)
75 Yamaha RD250B   75 Yamaha RD200B (project)
73 Yamaha RD350     77 Yamaha RD400D   79 Yamaha RD400F  
91 Yamaha TZR250R  89 Yamaha FZR400   05 Yamaha FZ6   
05 Yamaha XT225TC  82 Honda MB5  02 Aprilia RS250 Cup (sold)

m in sc

Quote from: bitzz on December 20, 2020, 08:38:27 PM
My guess would be it was modified to accept a balance tube intake like a RD400 or RZ.
The way the port is hogged out probably a RZ or Banshee intake.
^ this.

ive seen them angled towards the cyl as well using straight intakes.

RdsOnly

nPERIOD CORRECT- POWER MODS

jtOT WORTH COMMENTING ON- SO WRONG FOR

racerclam

Just stupid grinding the reeds cover those trenches , all it did was increace crankcase volume

Rich

teazer

And that would generally be a good thing as long as the pipe can use the extra volume. Let the waves do the work...