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Re: BSA C15/SS80 cruising speed?
[Re: kommando]
#546395
06/02/14 4:11 am
06/02/14 4:11 am
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Joined: Oct 2008
Posts: 1,666 Canada
LarryLebel
BritBike Forum member
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BritBike Forum member
Joined: Oct 2008
Posts: 1,666
Canada
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At 65 you ass and hands will go numb so you won't be riding at that speed very long even if you could.
Last edited by LarryLebel; 06/02/14 9:52 am.
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Re: BSA C15/SS80 cruising speed?
[Re: downhere]
#546840
06/04/14 11:05 am
06/04/14 11:05 am
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Joined: Sep 2002
Posts: 7,813 Seattle
Alex

BritBike Forum member
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BritBike Forum member
Joined: Sep 2002
Posts: 7,813
Seattle
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Yeah, and then your conrod will come up and hit your chin! Happen to you a lot? Mind you the taller gearing helps here because there is another weakness, particularly in the C15S/SS and that is that with low gearing they will pull right past where they should. The roller big ends don't like revs over 8000 rpm (the rollers don't roll any more, they slide). This I know from experience  . Mind that limit, though and a properly assembled roller big end will tolerate just about anything other than running out of oil.
A smattering: '53 Gold Flash '67 Royal Star '71 Rickman Metisse '40 Silver Star '37 Rudge Special sixtyseventy Lightboltrocket road racer...and many more.
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Re: BSA C15/SS80 cruising speed?
[Re: Alex]
#546854
06/04/14 12:25 pm
06/04/14 12:25 pm
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Joined: Nov 2011
Posts: 4,279 U.S.
Magnetoman

BritBike Forum member
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BritBike Forum member
Joined: Nov 2011
Posts: 4,279
U.S.
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a properly assembled roller big end will tolerate just about anything other than running out of oil. The C15 doesn't get the respect it deserves, largely because of people repeating things they had heard of problems suffered 50+ years ago by the very earliest non-roller bearing engines. My C15S (with roller bearing) suffered ~5000 miles of hard use at my hands before I turned it over to John O'Regan in Cork, Ireland to undo the cumulative damage I had done. I've subsequently put another ~1000 miles on it, with all ~6000 miles spent making it keep up with the 500s and 650s I ride with when I'm using that bike in Ireland. As I wrote in an earlier post I have my C15S geared for a redline of 84 mph and it purrs along effortlessly at the 45 mph many of the roads limit it to. However, when needed to keep up with the bigger bikes on main roads it goes miles at a stretch at 65 mph, with power to pass cars even at that speed. However, I try to limit top speed to 65 because the bike is located thousands of miles from me so I want it to last a reasonable length of time between major work. Two more things about a C15S. Wherever roads limit top speeds to ~45 mph a 250 performs as well as a 500. Or, even better, in that it is more maneuverable. Also, at the end of a long day, when it's time to start the bike one last time for the ride back to the hotel, kickstarting a 250 is a lot nicer than kickstarting a high compression 500.
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Re: BSA C15/SS80 cruising speed?
[Re: sprung hub]
#546916
06/04/14 6:31 pm
06/04/14 6:31 pm
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Joined: Jan 2005
Posts: 85 Sacramento, CA
sprung hub
OP
BritBike Forum member
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OP
BritBike Forum member
Joined: Jan 2005
Posts: 85
Sacramento, CA
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Thanks Alex! I will have to strobe time it, and I've only just sorted out the jetting. I ended up going with a new Concentric. It's close and certainly rideable as is, but still a tick rich. Dean
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Re: BSA C15/SS80 cruising speed?
[Re: sprung hub]
#546934
06/04/14 7:57 pm
06/04/14 7:57 pm
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Joined: Sep 2002
Posts: 7,813 Seattle
Alex

BritBike Forum member
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BritBike Forum member
Joined: Sep 2002
Posts: 7,813
Seattle
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Thanks Alex! I will have to strobe time it, and I've only just sorted out the jetting. I ended up going with a new Concentric. It's close and certainly rideable as is, but still a tick rich. Dean It's a bit of a pain since you have to take the primary cover off and have to make your own marks, but well worth it.
A smattering: '53 Gold Flash '67 Royal Star '71 Rickman Metisse '40 Silver Star '37 Rudge Special sixtyseventy Lightboltrocket road racer...and many more.
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