Swingarm differences for 250F?
Posted: January 1st, 2010, 7:53 am
Are there any differences as far as weight, length, etc. between the various years 250f swingarms?
Addressing the survival of the legendary CR500!
https://www.bannedcr500riders.com/
Also about the 2006 CRF250R:When the 2004 CRF250R came out, there was no doubt Honda had a winner. The bike had huge sales and even won our 125 class shootout. Despite its success, Honda decided the little thumper needed revamping. The 2005 CRF250R features changes to the motor and suspension, improvements in the clutch and transmission, a new exhaust pipe, lighter swingarm and more consistent braking.
What's New!
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• Head with intake valve seats of a material that will extend valve life, oval ports for improved high rpm power and exhaust valve stems (and seals) that are 5.0 mm in diameter instead of 5.5.
• The exhaust cam has more lift and more duration for more power.
• Piston has a more crown with a more squared-off shape for better sealing and a higher compression ratio (up from 12.5:1 to 12.9:1)
• Piston ring that is thinner (0.8mm vs. 0.9mm) for less friction.
• Keihin carburetor with throttle position sensor is 40mm instead of `05's 37mm to boost top-end power.
• Twin-muffler exhaust and 5mm lower radiators centralize mass and lower the center of gravity for a lighter feel to the handling.
• Lighter and stronger front hub and swingarm.• Shorter, lighter outer fork tubes.
• Suspension valving is refined for a smoother action.