my dad was helping me today and he claimed it started on fire. i think it was just smoking real bad but...anyway dry grass everywhere it's the center spindle it's been bad for a while and i ordered the part and had it on hand but i thought i got the wrong part. apparently they updated the spindle and gave it a bigger shaft. it also has a larger top pulley. the old pulley was 5.75 the new one is 6.75. will this make the blades spin faster with the pulley being bigger??????? i can see where it might have more grab with more of the belt in contact with the pulley.