I guess the poor guy/gal on the line at Yamaha was allowed about 10 seconds per cylinder to do clean up with their grinder. The third one has a big ridge that comes across.
(https://i.ibb.co/ck8vhSy/porta.jpg) (https://ibb.co/vVdB46c)
(https://i.ibb.co/ZxFp5j8/portb.jpg) (https://ibb.co/RcskfF0)
(https://i.ibb.co/ft6z9gg/portd-2.jpg) (https://ibb.co/NpDdrvv)
(https://i.ibb.co/HKGBdby/portf.jpg) (https://ibb.co/b6NQJCV)
(https://i.ibb.co/sgLp8PS/portc.jpg) (https://ibb.co/7S7xszc)
400's are nice compared to the older 350's!
All RD's need to be ported as far as I'm concerned!! Just old 70's crappy castings...
C
They look like this when I port them...
Chuck
(https://photos.imageevent.com/supertune/rd350enginebuildpics/large/100_8121.JPG)
(https://photos.imageevent.com/supertune/rd400streetporting/large/100_7707.JPG)
More..
(https://photos.imageevent.com/supertune/paulsrd400/large/20180828_220113.jpg)
(https://photos.imageevent.com/supertune/paulsrd400/large/20180828_220047.jpg)
(https://photos.imageevent.com/supertune/paulsrd400/large/20180828_220233.jpg)
dammit chuck. there's a 'no porn rule'
:toot:
:clap: