I recently bought a used 1988 Suzuki DT30. On the first trip on the water, the motor ran great, though it idled a little too high. For some reason, I decided to try to adjust the carbs before getting my manual. After that it ran horribly. After getting the manual, I set the carbs to where they should be, but the engine still runs bad. I pulled the plugs and found that the bottom plug was dry and sooty. I took another trip to the lake and tried making some adjustment. As I run, the rpms are nowhere near where they should be. At a medium to low speed, occasionally the engine will sputter some as it slowly picks up rpms. It will get to the point where you think it's going to run well, then falls back down. When I pulled the plugs after that trip, they were all the same and looked fine. I have spent hours reading through the archives here, and have a few ideas, but I was wondering if I was on the right track. First thing I did was pump the primer bulb. It made no difference, though the bulb will not get hard. No matter how much I pump, it stays the same. Right now I am in the process of cleaning the carbs. My thought was that the bottom carb was getting blocked, therefore the spark plug would be dry and the engine is only running on two cylinders. Does any of this make sense or are there some other things I should be looking at?
