JustRandy

Update. My regulator was bad. Big crack in the back and bulging out. I swaped it. Now I have 14.3 volts, but no change in how it runs. Ignition coil was at lower end of where it should be on ohms, but close enough I guess. I cleaned the grounding points. I pulled that silly rubber strap off my gas cap and verified I have a good hole there so the tank doesn't develop a vacuum. It seem nothing I do will produce a change in how it runs. Big jets, little jets,,,, it doesn't matter. Choke is always needed and sometimes it will rev and sometimes not. Sometimes it will idle nicely and then I sit down and just wait. A few min will pass and it will get slower and slower until it dies. Makes me think its rich. Well, why does the choke make it run better? I need a priest. This thing is possessed or something. Its funny because I'm usually the carb guy. I can take a bare carb body and figure out what fuel jets, air jets, needles, and slides work and do it with no airbox! I don't like to pat myself on the back, but just throwing that out there. This really has me puzzled though. I'm about to set a tank on the rack and gravity feed a regular carb just to see. I usually respect japanese engineering but those guys must have been hittin the saki hard when they came up with this!

Hello. This is a neat little forum and every thread I see has replies with reasonable answers, so I signed up in hopes of getting to the bottom of my 300 king quad problems I was using another forum, but it seems I'm the only guy answering questions over there lol. Anyway, I'm having trouble similar to the OP. It just seems the carb isn't getting enough gas. Thanks to oxidized_black, I was able to get the service manual and I set the float just over .5 inch (It was way high). I noticed when I pressed on the float, before it used up the spring inside the needle, the float would hit the carb body. That didn't seem right to me so I left it at that setting without going fully to .5 inches as the spec said. I've also installed a 40 pilot jet in place of the 37.5. I've installed a 140 main in place of the 120 something. Needle clip is per spec at 4 clip from top. All these specs seem odd to me. Usually carbs are set at 3rd clip (middle one) and mixture screw is 1.5 turns out instead of 2 5/8 like the spec says. So even with all this richening, I'm still having to use the choke to idle and oddly enough, I'm having to use it more the hotter the engine gets! Which is making me think its something electrical. Only electrical things crap out with heat. But what could it be? And sometimes it will rev out nicely. Then I head for the road to see how fast it will go and it acts like the road scares it LOL! It acts like its out of gas. So I limp back to the yard fearing I'll be stranded on the road and it runs good again as soon as it hits grass. I'm baffled. I had the petcock problem everyone else had and I bypassed that. I took the fuel pump apart and polished the corrosion off. There's no reason the pump shouldn't be working right. Valves are set right, but engine is full of gas due to the petcock problem. Its not insanely full, but it is overfull. I've read this can cause problems, but its hard for me to imagine it would cause an engine to run lean. I don't want to drain it and refill because as soon as I get it running right, I'm tearing the engine apart. IE I don't want to waste 4qts of oil. Unless someone really really thinks it could cause big problems. I don't want to break in a new engine with carb problems. Thoughts?