Hello all I have a 1988 300 fourtrax I rescued from the scrap yard. Rebuilt the top end last year and went ahead and orderd new carb fixed some wiring issues and ended up having to replace Cdi to get good spark. I bought the carb off of eBay for like 70 dollars and was real concerned about how well it would perform. At first it did great but then gas started leaking from the overflow. I’ve taken it apart more times then I can count and cleaned valve and seat. Same thing always ends up happening after awhile it either leaks gas like a siff from overflow or the float sticks shut and bike runs out of gas. Just wondering if anyone had any advice on what to do cuz I’m at a complete loss. I feel as though there’s a way to better tune the carb but I guess I’m missing it if there is. So far I’ve put new fuel line vent hose, in line filter and new petcock valve(other one was full of trash). I’m pretty mechanically inclined have always had boats and wheelers and have never been to the point of wanting to bang my head on a wall with a carb issue so bad in my life. Any help would be appreciated. Also this may or may not help but ran it at the lease for two days and it ran as it should never leaked gas even pulled me my daughter and a deer back to camp about 2 miles and never flinched. The next day we we’re doing chores around the lease and it didn’t sputter just died. Took bowl off of carb and it was a little dirty but the spark plug on the other looked fouled to me real black not neccesarily oil black but just running really rich. Any help would be greatly appreciated. Thanx in advance.

Hello all I have a 1988 300 fourtrax I rescued from the scrap yard. Rebuilt the top end last year and went ahead and orderd new carb fixed some wiring issues and ended up having to replace Cdi to get good spark. I bought the carb off of eBay for like 70 dollars and was real concerned about how well it would perform. At first it did great but then gas started leaking from the overflow. I’ve taken it apart more times then I can count and cleaned valve and seat. Same thing always ends up happening after awhile it either leaks gas like a siff from overflow or the float sticks shut and bike runs out of gas. Just wondering if anyone had any advice on what to do cuz I’m at a complete loss. I feel as though there’s a way to better tune the carb but I guess I’m missing it if there is. So far I’ve put new fuel line vent hose, in line filter and new petcock valve(other one was full of trash). I’m pretty mechanically inclined have always had boats and wheelers and have never been to the point of wanting to bang my head on a wall with a carb issue so bad in my life. Any help would be appreciated. Also this may or may not help but ran it at the lease for two days and it ran as it should never leaked gas even pulled me my daughter and a deer back to camp about 2 miles and never flinched. The next day we we’re doing chores around the lease and it didn’t sputter just died. Took bowl off of carb and it was a little dirty but the spark plug on the other looked fouled to me real black not neccesarily oil black but just running really rich. Any help would be greatly appreciated. Thanx in advance.