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AF swap, what springs
Posted: March 12th, 2010, 9:42 pm
by Hillbilly500
Ok, did the af swap and love it.. How much have people been increasing the front springs to compensate for the heavier motor? Just one size up? Want to keep the cr250 bike balanced feeling.. Right now it does feel a little nose heavy
Posted: March 13th, 2010, 1:44 pm
by CR500R7
It all depends on the spring rate in the forks at the moment and your weight plus the little extra added from the 500 engine.
It could be possible the springs in there now have to much rate to start with or could be way under rated and then again they could be spot on now.
First weigh yourself then add about 5.5-6 lbs gen3 CR250 ( 21 lbs gen3 CR125 ) for the engine and check with a suspension place to see what rate spring they recommend.
Gen 1 CR125 / 250, Gen 2 CR125 / 250, Gen 3 CRF450 and Gen 4 CRF250 / 450 and the type of conversion will all have a different weight value to consider.
Then check to see what rate spring you have in your forks now and adjust from there.
Posted: March 13th, 2010, 1:49 pm
by Hillbilly500
Yep, again rather versed with setting up suspension on bikes, just wondering what guys have been doing and having good luck in the af... If 9 pounds is all that it is different should be easy to figure.. Thanks
Posted: March 23rd, 2010, 12:26 am
by thestuz
what weight are you? what bike is it? the motors shouldnt really upset the ballance. try riding it for a while, its prob just you getting used to a new bike feel.
Posted: March 23rd, 2010, 6:29 am
by Hillbilly500
Played with the sag till I got the balanced feeling I was looking for.. All good..
Posted: March 23rd, 2010, 7:14 am
by redrocket190
2006 Honda CRF250X Chassis
180-185lb rider without gear (factors in engine)
Motocross
0.46 kg/mm front
5.2 kg/mm rear
Springs by Factory Connection
Valving by Billy Nichol Racing in San Clemente
Race sag at 110mm
Fork tops flush with triple clamps