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 Post subject: S1 or S2 pipes
PostPosted: Sat Sep 16, 2017 8:06 am 

Joined: Sun Sep 01, 2013 10:52 pm
Posts: 1222
Location: South Dakota
I need a left side and a right side lower exhaust pipes for an S1A. The pipes for both 350's and I think all the 250's will work. As long as they are solid and can be re-chromed they will work. Thanks!

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1969 H1, 1971 G3SSA, 1974 G5, 1973 H2A, 1975 S3A, 1975 H1F, 1973 Z1, 1988 HD FLTC, Captain America chopper, 2000 Excelsior Henderson, 1965 Bridgestone BS90


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 Post subject: Re: S1 or S2 pipes
PostPosted: Sat Sep 16, 2017 8:16 am 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 9826
Location: North Central NC
Have you seen the differences in head pipe length and expansion chamber shape of stock S1 and S2 pipes on the resource site?

http://www.kawatriple.com/partid/baffle ... arison.htm

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If it surges, that's normal, upshift.


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 Post subject: Re: S1 or S2 pipes
PostPosted: Sat Sep 16, 2017 10:26 am 

Joined: Sun Sep 01, 2013 10:52 pm
Posts: 1222
Location: South Dakota
Thanks Jim, I'm pretty sure the outer dimensions are the same on the S1, S2 mufflers but I suppose the performance difference the insides have would make the bike run funny if I mixed them up.

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1969 H1, 1971 G3SSA, 1974 G5, 1973 H2A, 1975 S3A, 1975 H1F, 1973 Z1, 1988 HD FLTC, Captain America chopper, 2000 Excelsior Henderson, 1965 Bridgestone BS90


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 Post subject: Re: S1 or S2 pipes
PostPosted: Sat Sep 16, 2017 11:35 am 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 9826
Location: North Central NC
It's hard to say what the difference would be, but from the looks of the inside of the pipes, the S1 version is designed for a bit higher RPM. The expansion chamber is smaller and the head pipe is shorter.

On the other hand, Denco sold chambers for the S1 and S2, and they were the same part number. :lol:

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 Post subject: Re: S1 or S2 pipes
PostPosted: Sat Sep 16, 2017 8:16 pm 
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Joined: Tue Aug 21, 2012 5:01 am
Posts: 277
Location: Brownsburg IN
Pm sent. I have a 73 s1 full set


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