Ferris pro cut z problrem

[marine6132]

Hello, I have a Ferris pro cut z with a kolar25hp. CV25. The problem is that it will crank andidle great. But, while running it had a sound coming from the muffler like if you were holding a air hose a depressing the nozzle in short bursts. After inspecting the muffler I did find a small hole. The big problem is that when I give it full throttle and engage the blades the motor bogs down and when i lower the deck and start tomow grass , the motor will almost cut off, as soon as i desengage the blades , the motor goes back to operarting fine. i've put new gas in it, changed the fuel filter , gresed the spindles, checked the electric clutch and spindles for binding and also checked the sparkplugs which look fine. Any help would be greatly appreacated!!!!!!!!

 

[Shooter1865]

Have same problem replaced muffler once solved the problem for a while. Then new muffler went bad. Mufflers are expensive for it. That fixes the problem though. I am thinking of modifiing the muffler before I buy a new muffler.