Crank Balance Factor

keysey · Post by **keysey** » March 23rd, 2011, 11:33 pm

Hi, can someone let me know what a good balance factor would be for my AF crank? Im going to get the crank balanced but have heard all sorts of numbers from 52% to 74%. If someone knows a figure that has worked well for them that would be good. The engine is an 89 model

seanmx57 · Post by **seanmx57** » March 24th, 2011, 1:16 pm

http://www.surfnturfracing.com/CR500%20 ... ancing.htm

These guys did mine, smoother than my 250 now excluding at idle speeds. I doubt he will tell you the BF, I think it was around 56% but steve is tight lipped about the affair.

AMA714 · Post by **AMA714** » March 24th, 2011, 6:50 pm

Sean, did you end up with adding material or shaving material at Surf and Turf..

seanmx57 · Post by **seanmx57** » March 24th, 2011, 7:29 pm

added

details here

http://cr500riders.com/cgi/yabb/YaBB.pl ... 539306/0#0

keysey · Post by **keysey** » March 24th, 2011, 9:50 pm

Thanks for the info and links, There is very little on the net about actual balance factors so I think I will go with 56% and see how it goes. I want it smoothest in the 4000 - 7000 rpm range.

2strokeforever · Post by **2strokeforever** » March 24th, 2011, 11:56 pm

mine had weight added, same at idle, less as it revs up

gregrobo · Post by **gregrobo** » March 25th, 2011, 1:06 am

im running stock crank with 01 250 ignition and fly wheel and the difference is chalk and cheese used to vibrate like a mofo now smooth as

100hp honda · Post by **100hp honda** » March 25th, 2011, 3:55 pm

ktm honda crank worked out to within a few grams according to cranksworks with a modified wiseco. no weight added or removed. im assuming they balanced back to factory specs. never really asked any questions. havent ran it yet but it better not vibrate.

BannedCR500Riders.com

Crank Balance Factor

Crank Balance Factor