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Crank Balance Factor
Posted: March 23rd, 2011, 11:33 pm
by keysey
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
Posted: March 24th, 2011, 1:16 pm
by seanmx57
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.
Posted: March 24th, 2011, 6:50 pm
by AMA714
Sean, did you end up with adding material or shaving material at Surf and Turf..
Posted: March 24th, 2011, 7:29 pm
by seanmx57
Posted: March 24th, 2011, 9:50 pm
by keysey
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.
Posted: March 24th, 2011, 11:56 pm
by 2strokeforever
mine had weight added, same at idle, less as it revs up
Posted: March 25th, 2011, 1:06 am
by gregrobo
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
Posted: March 25th, 2011, 3:55 pm
by 100hp honda
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.