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 Post subject: Planning The S2
PostPosted: Mon Apr 09, 2012 12:50 pm 
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Joined: Thu Jun 09, 2011 3:35 pm
Posts: 562
Location: Cedar Rapids, Iowa
Friends, I have shared that I inadvertantly bought a local S2 350. And with the unforeseen project in the planning stages, I thought I would ask for some input.

Again it is a '72 with steel fork legs and rusty fork tubes, for a cost effective fix, what would be the best front end (off another model) for the old girl?

Pipes are dinged and stained, what pipe options do you like?

Has anyone been able to find stock pipes that are worth installing?

I would kind of like to keep a stock look but with an upgraded front end (disc brake).

Stock pipes would be OK but if it is like bigger triples, chambers are the only thing that won't break the bank.

Motor mods?

Is the 4 bearing crank that much of a problem?

Can you retrofit a 6 bearing crank?

Electronic ignitions?
Thanks guys.

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 Post subject: Re: Planning The S2
PostPosted: Mon Apr 09, 2012 1:02 pm 
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Joined: Tue Jun 07, 2011 6:36 am
Posts: 2696
Location: Dandridge, TN, USA
My $.02...
If you want a disc front end use any S or KH... KH400 is probably the better.
Jim's Denco's would be, by far, cheaper and better performing than stock.
Points aren't a big problem.

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 Post subject: Re: Planning The S2
PostPosted: Tue Apr 10, 2012 2:16 am 
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Joined: Fri Jun 10, 2011 11:04 am
Posts: 3490
Location: Capitol of Ca, USA
battleax wrote:
Again it is a '72 with steel fork legs and rusty fork tubes, for a cost effective fix, what would be the best front end (off another model) for the old girl?

Like Dale suggested, I also have S3 forks, clamps, and rim for the simple upgrade, but plan to mod the upper clamp to retain the 72 gauges.

Pipes are dinged and stained, what pipe options do you like?
Has anyone been able to find stock pipes that are worth installing?

Though decent used S2 stockers don't seem as pricey as their bigger counterparts, +1 on Jim's clones.

Motor mods?

I'm planning on installing Moo's reeds in my S2 motor. If money will allow, I was thinking of also looking into some port matching and porting, and also combustion chamber work from Scott Clough Racing here in CA, like Tim Steele had done to his S-series not too long ago (matching and head work I believe).

Is the 4 bearing crank that much of a problem?

I believe the Service Bulletin stated updating to a 6-bearing was more a precautionary measure.

Can you retrofit a 6 bearing crank?

Again referring to the Bulletin, if I recall correctly, you just need to drill 2 additional oiling holes in the upper case half to provide proper oiling to the 2 addtional bearings.

Electronic ignitions?

I still have a Boyer Brandsen in the box and will likely go with that. M in SC also adapted a late H1 iggy to his 73 S2A if I'm not mistaken.

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 Post subject: Re: Planning The S2
PostPosted: Tue Apr 10, 2012 3:46 am 
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Joined: Thu Jun 09, 2011 3:06 am
Posts: 4364
Location: PARIS FRANCE
4 bearing crank gave troubles and can dammage definitively the crankcases: 6 bearing is the way to go as did mother Kawa :mrgreen:


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 Post subject: Re: Planning The S2
PostPosted: Tue Apr 10, 2012 6:03 am 
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Joined: Thu Jun 09, 2011 6:36 am
Posts: 1369
Location: Inman,S.C.
I know a few people who have had problems with the Boyer electronic set up.I'm sticking with points on mine. S3 carbs and clutch seems to be a popular mod also.


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 Post subject: Re: Planning The S2
PostPosted: Tue Apr 10, 2012 7:29 am 
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Joined: Thu Jun 09, 2011 3:06 am
Posts: 4364
Location: PARIS FRANCE
am points on my S2A, standart ignition, no troubles at all :mrgreen:


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 Post subject: Re: Planning The S2
PostPosted: Tue Apr 10, 2012 12:59 pm 

Joined: Thu Jun 09, 2011 9:13 am
Posts: 19
Location: Nj-10min from 6flags o fun
my s2a starts up easy with stock points

my father has all kinds of problems with the boyer on his bsa


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 Post subject: Re: Planning The S2
PostPosted: Tue Apr 10, 2012 3:13 pm 
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Joined: Wed Jun 08, 2011 5:34 pm
Posts: 2793
Location: Front Royal, VA
It was the H2 top end I sent Scott. He does great work. I have a spare 6 bearing crank if you need one. I am running a Boyer and I love it because I hate points. I killed my 1st one due to negligence from a hot battery cable loosening while it was running. They are unforgiving with any kind of arc. I have some spare disc brake stuff too. I would do the EX caliper conversion like I did if you really want it to stop. I am running an EX mastercylinder, clutch perch and steel braided line as well. Let me know if I can help in any way.

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 Post subject: Re: Planning The S2
PostPosted: Tue Apr 10, 2012 8:59 pm 
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Joined: Wed Jun 22, 2011 8:07 pm
Posts: 1759
Location: houston texas
hey joe i have the tripple trees, forks ,and disc/rotor (no wheel) from the kh400 parts bike ,
you are welcome to them.
just the shipping might be steep.(but i get buisness rate at work though usps)
cheers mark

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 Post subject: Re: Planning The S2
PostPosted: Wed Apr 11, 2012 5:53 am 
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Joined: Wed Jun 08, 2011 10:28 pm
Posts: 1560
Location: Tampa Bay Florida
I thought only early 72 S1s and S2s had the 4 bearing crank? :think: Even though it's a 72 it still may have the better 6 bearing crank, unless you've opened it up already and know for sure... if that's the case, never mind! :roll:

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