I have just completed and engine change on my 06 fatboy. This bike came with a 20mm drive belt instead of a 25mm like all the other softails. I have put a Jims120 in it and things seem to be okay but haven't taken it over 3500 rpm's for the break-in period. I put a steel laced belt in just to be safe but still wondering if I should have gone with a chain drive with 130 pounds of torque and close to the same in HP. I see that "stratus" another member on this board has done about the same with his Fatboy so does anybody know how he went with his bike(chain or belt) as he is turning up alot more than I am. The clutch is probably going to be a problem also, so is there any advice there for changing out the SE clutch to a heavier one. Thanks for reading and I hope to get some good advice.