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w.premoThu Mar-25-10 02:06 PM
Member since Mar 14th 2010
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"norton 1972"


          

I am trying to get my old bike going. Do i have to change valves out to run unleaded? Someone told me it already has the right valve seats. Is this right for this year?

  

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dynodaveFri Mar-26-10 11:30 AM
Member since Mar 18th 2009
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#1. "RE: norton 1972"
In response to Reply # 0


  

          

AFAIK all norton heavy twins with aluminum heads have excellent seats.
Original early valves are probably not as good an alloy as you can now get. I would say, drive it until it needs a valve job then upgrade the valves.

  

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w.premoFri Mar-26-10 03:13 PM
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#2. "RE: norton 1972"
In response to Reply # 1


          

Thank you, is there anything I need to do to the pistons?

  

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dynodaveMon Mar-29-10 11:37 AM
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#3. "RE: norton 1972"
In response to Reply # 2
Fri Apr-16-10 10:09 AM by dynodave

  

          

"IF" the pistons are 72 original, then they should be the deeper/later cross section rings, which are the same for 73 and all later 750 replacements. They are the good rings....stock late 750.
"combat" is the head and cam, not special pistons....just upgraded stock...

  

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w.premoThu Apr-01-10 01:18 PM
Member since Mar 14th 2010
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#4. "RE: norton 1972"
In response to Reply # 3


          

Thanks again Hope to see you on the road soon.

  

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