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VIR question

 
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Derek Cuthbertson



Joined: 28 Oct 2001
Posts: 132

PostPosted: Mon Jul 01, 2013 9:29 am    Post subject: VIR question Reply with quote

I'm putting a jr sprint yamaha together for my son. What's a good starting gear ratio for VIR ?
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Martin Secrest



Joined: 23 Jul 2001
Posts: 1677
Location: United States, Virginia, Arlington

PostPosted: Wed Jul 03, 2013 5:07 am    Post subject: Reply with quote

What kind of HP does that kart put out? I'm thinking 5.0 is ballpark on a 34" tire.
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Derek Cuthbertson



Joined: 28 Oct 2001
Posts: 132

PostPosted: Wed Jul 03, 2013 12:44 pm    Post subject: Reply with quote

Not sure on hp. This is a new class for us . We bought the kart a few weeks ago and have everything except belt gears . The class runs the three hole can and we have a horstman axle clutch. Thanks .
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Mike Arnold



Joined: 08 Nov 2005
Posts: 1095
Location: United States, Kentucky,

PostPosted: Wed Jul 03, 2013 3:15 pm    Post subject: Reply with quote

Try around 16-75 gear with clutch around 8300 rpm. This would be a baseline or starting point.

Mike
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Derek Cuthbertson



Joined: 28 Oct 2001
Posts: 132

PostPosted: Thu Jul 04, 2013 3:38 pm    Post subject: Reply with quote

Thanks mike, I got a hold of my cousin who used to run endure jr and he was guessing in the same ballpark. He also let me borrow all his gears so we'll be able to figure out what we need. Looking forward to seeing everybody at VIR... Thanks.
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