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       #Post#: 58413--------------------------------------------------
       Re: 70mm pistons 070/090
       By: neil Date: May 31, 2015, 9:50 pm
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       [quote author=ej link=topic=4591.msg58411#msg58411
       date=1433124721]
       neil I have a lot of race saws I have enjoyed every one of them.
       I never made these 70mm for anybody but my self if somebody
       wants its fine the 68mm is the limit that we wanted to put on
       the 3120 Husqvarna the 10 cube was my own thoughts on racing
       vintage races on direct drive and gear drive were the year has a
       limit. I been racing for over 30 years and I enjoy it sometimes
       I have got out of racing but always enjoyed it now i'm getting
       back into it and I have always wanted a 10 cube saw the helsels
       are great people and have and build the fastest saws in the
       world bar none
       [/quote]
       Good to hear ej, sounds like you know what you want and how to
       get it and nice to hear you have raced for so long.
       State side racing is very different to ours, so are the saws of
       coarse.
       I'm  a no body in regard to development, suits me just fine tho
       as I don't get into the AS builders arguments, I do read a bit
       on there tho.
       #Post#: 61835--------------------------------------------------
       Re: 70mm pistons 070/090
       By: trappermike Date: September 21, 2015, 2:42 pm
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       I built an all-out 090 and raced it hard,it was very satisfying
       to beat the McCulloch cart engines! I wellded the crank so it
       wouldn't twist,and used a smaller lighter flywheel with
       electronic ignition from a smaller Stihl,never broke the crank.I
       would set it to rev to 14,500 and it happily did so.I also
       incorporated a separate head I designed,reed valves,max
       porting,and a huge carb,and the pipe worked well too.They are a
       heavy brute to cold start,but in my area the big snowmobile
       D-handle was ok. The only real problem was cooling,I really had
       to work to get as much cooling as possible,cause it could get
       hot fast.But we cut pretty big wood in the North in local
       contests,I won in Smithers B.C. and the logs were tough
       fir-28",2 passes,cold start. My time was 12.18 seconds.I love
       the old beast,it's just a showpiece inside now...
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