When I initially bought my lace the previous owners left behind a JD 60(?) rider or maya be it was a 65, but anyway they left behind a 8hp JD rider mower. I figured great, but odds are it was left because it was 1 either wore out, or broken terminally, or two it was included in the price of the property or three they moved in to an apartment and did not get it sold before they moved......The correct answer was number 1. So already having a JD317 I played around with that rider, and it smoked so bad you could not see in front of you after about 10 minutes of use. I used straight 50# oil, and also played with adding chemicals for skeeters to the fuel and also into a tube fashioned around the muffler etc etc. It did hold the skeeters at bay for a little while.
The neighbor used to always add some chemical to his MF 135 that was supposed to keep inscects back. He swore by it, and bought it in 5 gal containers, which was added to the diesel fuel. He used it 365 days a year..........for many years.
he is long dead but his wifes new boyfriend uses the tractor around the place yet, and as much as it smokes I would only have to say it may be from using all that chemicals in it in its past. I hate to hear him crank it up as it means a foul smell like heavy traffic in the city once he is using it, and a heavy smokey cloud.........and mosquitos are just as bad.
Just how do those mosquito magnets work? Kind of pricey, but supposedly the ticket to keep the critters in check.