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Post  James clive Fri Jul 16, 2021 12:02 pm

Can anyone tell me the depth of bottom exhaust slit on original
Killer bee am making a clone using surestart cylinder which measures
.025 think should be .050 giving spi of .025
Thanks
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Post  crankbndr Sat Jul 17, 2021 12:56 am

I just put feelers in that bottom port and worked my way up to .043 was tight fit maybe .044. At TDC the SPI was about .015.
Most exhaust is moved out top port, at BDC the bottom port was open a few thousands at most.
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Post  dckrsn Sat Jul 17, 2021 2:03 am

That reminds me, Doug, I gotta get a set of
feelers that were common when distributors
had points. They were about 3/8" wide, and
came to a small, tapered, rounded, end. Thanks.
Hey James clive, WELCOME TO THE FORUM
Bob
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Post  crankbndr Sat Jul 17, 2021 2:30 am

Yes, those are good. Mine are old as me and getting hard to read. For some reason I was always messing with points on my old Chevy V8s. One time I put the rotor back 180 degrees off, square peg in round hole thing. Put cap back on and cranked the biggest backfire out my glass packs I ever heard. Sounded like a bomb. LOL OOOPPPPSSS. I had glass packs with pipes the came out the sides in front of the rear tires. In those old engines you could turn the key off for a few seconds and when turned back on would backfire. Got many bridge fisherman and pedestrians that way. Was that wrong? lol!
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Post  James clive Sat Jul 17, 2021 3:56 am

Thanks crankbndr @ others sounds spot on my measurements for a
Surestart fly are total port opening Inc centre bar .100 with bernies mod
Ie removing centre bar & deepening port .131 giving spi of .030 with
Tightly clinched ballpoint however after abt 30 minutes running the ball joint
& big end have settled into pretty mutch there best running clearances
& all will now measure approx .026 .027 ideal for high speed work
Being approx 85 degrees good when you consider the frog 150r & half in
Hurrikan came from the factory sporting 80 degrees Spi
Thanks all
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