03-25-2011, 08:23 AM | #31 |
Join Date: Mar 2011
Posts: 54
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Spoke to the Guys down in PIT Motors LTD and they will be doing some live load testing cause I was thinking of taking the 15/42 to a 15/38
Will keep you guys posted |
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03-25-2011, 11:07 AM | #32 |
Join Date: Feb 2007
Posts: 1,357
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Gardo,
That 15/38 would be the same as my 13/33 which might be a little high for a young guy like you. Anyway it's easy enough to change the rear sprocket with the right o-ring pliers. Be nice to see the dyno power curve from PIT. I might take mine over to my dyno guy. |
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03-25-2011, 11:57 AM | #33 |
Join Date: Mar 2011
Posts: 54
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Barnone - I dont understand your meaning of "too high" could you explain please
thx |
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03-25-2011, 12:24 PM | #34 |
Join Date: Oct 2010
Location: Victoria, BC
Posts: 114
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I'm running 15-42 on my 167fmm and it will stay pinned at 8k rpm+ on all but the steepest hill. I'm going to a 16-42 and I'm sure it will pull it fine as this motor is all low end. This is on a an upright dualsport so I'm sure you should be fine.
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03-25-2011, 12:38 PM | #35 | |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Quote:
A 15/42 combo is a 2.80:1 ratio, and a 15/38 combo is a 2.53:1 ratio. The 2.53:1 ratio is higher (which is lower numerically), and that translates to more top end speed and less low end acceleration. The reverse is true for the 2.80:1 ratio.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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03-25-2011, 02:24 PM | #36 |
Join Date: Feb 2007
Posts: 1,357
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W&G,
Good explain as Darrell Waltrip 0f NASCAR fame says. |
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03-25-2011, 02:32 PM | #37 | |
Join Date: Feb 2007
Posts: 1,357
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Quote:
Thanks for the numbers and confirmation of my suspected low end power of the 167FMM engine. At least that how it feels to my butt dyno. |
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03-25-2011, 02:45 PM | #38 |
Join Date: Oct 2010
Location: Victoria, BC
Posts: 114
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Yea makes me wish there were hotter cams for this engine as I'm sure
there would be a pony or 2 to be had there.
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Saga 250 Enduro |
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03-25-2011, 05:48 PM | #39 |
Join Date: Mar 2011
Posts: 54
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Thanks WG that makes a bit more sense. i figure that i rode a Heist with the stock 15/42 I will play with it stock for now and play with the numbers some with the guys from PIT
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03-25-2011, 08:32 PM | #40 |
Join Date: May 2007
Location: Altamont, Kansas
Posts: 15,103
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Easy thing to try would be to swap a 16 or 17 sprocket on the front.
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03-25-2011, 10:39 PM | #41 | |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Quote:
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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