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Old 10-14-2011 | 08:34 PM
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1QwkSport2.5r's Avatar
1QwkSport2.5r
 
Joined: Oct 2006
Posts: 10,530
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From: Cottage Grove, MN
Default RE: Looking for timing numbers...

ORIGINAL: airraptor

ok let me know here or shoot me an email.

[email protected] or
[email protected]
I sent an email with info, and I'll post it here so I can find it again later..

Width of exhaust port in crankcase - .927"
Width of exhaust port in sleeve at widest point - .706" *outer corners are rounded and the port is split in two smaller ports with a divider between*
With piston at TDC, measurement from top of sleeve to top of piston - .163"
From top of sleeve to top of piston with Exhaust port just closed - .710"
From top of sleeve to top of piston with Transfers just closed - .790"
Diameter of channel in crankshaft - .427"
Diameter of carburetor barrel - .296"

Compression ratios:
Head volume + Squish volume = .04562012 cubic inch
Effective Swept Volume = .31405769 cubic inch
Effective Swept Volume + Total Head Volume = .35967781 cubic inch
Total Swept Volume = .45185266 cubic inch
Total Swept Volume + Total Head Volume = .49747278 cubic inch
Geometric CR - 10.90:1
Effective CR - 7.88:1
-With Shim Removed-
Geo CR: 12.84:1
Eff CR: 9.23:1

Advertised Bore: .858" (21.8mm)
Advertised Stroke: .787" (20.0mm)
Displacement .456 cubic inch - 7.47cc
(I was really bored tonight...)