Re: LT1045 w/20HP Kohler Hard Starting
It could be a defective filter that isn't allowing enough air flow when the motor gets taxed when the blades engage. I would spring for a new one, just to rule it out. They are not that expensive.
I would also have a look at the blades, spindles, belt and pulleys to make sure they are not worn out and putting undue pressure on the motor when engaging.
2008 Cub Cadet LT 1045
Manufacture date: 2/20/2008
Kohler 20 HP single cyl. Twin cam OVH
Spec No: SV600-0009