JustRandy

I put a 26mm roundslide from a 230 quadsport on and gravity feed tank and it runs like a champ. I spent the day seeing what all this machine will pull lol. I guess I need to find a 28mm carb somewhere. That's probably about right for this engine. This is just another reason why I hate CV carbs. Too many things to go wrong with them.

No disrespect but you'll find I'm kinda opinionated I'm really friendly though lol. But I hate the 700 king quad... almost with a passion! My buddy has had one since 2008 and first of all the caster problem almost killed me. I can't steer the hulkin beast once I try stopping! Its like a shopping cart with the wheels pointed the wrong way. The steering locks full left or full right and I can't pull it back without going fully the other way. Its dangerous! I'm surprised suzuki doesn't have a lawsuit over it. I've been beggin him to do the caster mod (well known mod) for 4 yrs but he don't want to cut into it because its "new". Caster adjustment Mod! Thanks DemiJohn And then, its too freaking big! In all directions! We ride together a lot and I ride my little 2 wheel drive 250ex. I'm ALWAYS having to wait on him or run the winch cable for him. He's either pinned between trees or can't climb or descend hills that I can tackle easily on my 250ex. Its laughable. Sometimes I have to get off and ride it for him, but I see his point. The king has such a high center of gravity and its so huge that it is scary. Body english doesn't mean much on that beast. He flipped it over backwards 4 yrs ago and sheared his thumb off. Cost $20,000 to put it back on. Ok if it isn't a hill or live trees he can't get around, its the ones that have fallen over. I can't drive over them, but I can man-handle the little quad enough to get over. The 700? Gotta stretch the winch cable out and take forever. But hey he should get better traction in snow and mud right? I haven't seen it. A couple winters ago we went riding with another buddy on his MudPro. As long as the snow wasnt over 6 inches, I actually did better than either one of them did. Once the snow got a foot deep I was screwed. But I guess 4x4 must have some redeeming features lol. A couple months ago we went camping and he pulled a 500lb trailer thru the mtns. I figured the king should be able to handle that no problem. Which it did going in, but coming out he got stuck on a red clay hill. Now the problem with CVT is evident. Once the tires started to spin, they took off full speed! He couldn't crawl. It was either full blast or nothing. CVT is nice for tooling around, but not good for manuevering technically or the best for traction. And there is a delay waiting for everything to kick in. And I can't go without mentioning he's sent his clutch off for work 2 or 3 times. And the belt slips. Its a pretty looking machine and it goes fast and oddles of power, but I wouldn't want one. In the real world trying to get from A to B its almost useless unless there is a nice road cut thru the woods. I guess it is nice to put your feet up on the racks and not worry about shifting. Its nice not to have to worry about a carb. But for me those things aren't nice enough to overcome all the problems it has. I haven't had the 300 king for long, but I like that its narrow (42 inches), really low center of gravity, has gears with a super low range. Its like a tank or bulldozer. I'm not kiddin! And it won't take off uncontrollably like CVT will. The fastest it will go in super low is 5 mph at 9000 rpm. Actually 5th gear in super low is about the same as 1st gear in high range lol! I love it and it makes any amount of work I have to do to it worth it. Its light enough that I can pick it up somewhat if needed to unpin it from around trees. The 700? Not a chance. I do wish they made a 300 king with fuel injection, but nothing exists that's even remotely close. The trend is for these huge gigantic machines. Everyone wants to see whose is bigger. If I wanted bigger, I would just drive my truck. The idea is to go smaller Sorry don't mean to offend. I'm just blunt and that's how I see it

After looking at the wire diagram I saw the blue w/black stripe wire is coming from the neutral and reverse lights looking for ground thru the neutral and reverse switches. If it finds ground, the lights come on. The same wire also comes from the neutral relay looking for ground at the same neutral and reverse switches. So it was easy to trick the relay into thinking the engine is in neutral all the time without having the light on all the time. Just cut the blue w/black wire at the relay and ground it. Easy Sorry the pics aren't better Now it starts in any gear and indicator lights work as they should.

If only they made quads like these with fuel injection

If the problem is starting a COLD engine only (IE it starts fine when warm, but not cold), its the intake valve. Check the intake valve lash. If the valve is tight, that means you have a crappy air filter and/or a loose connection letting dirt into the engine. Now that the hardness is worn off the valve, you're going to have to adjust the valve pretty frequently until the valve finally wears away. The oil change might have been a coincidence.

I've seen these engines run with almost no compression. I wouldn't sweat the compression test. The stroke is so long that you would have to have a gaping hole the size of your finger for it not to develop enough compression at starting speed. 3yrs is a long time. Did you clean the crud off the inside of the fuel pump? How about the petcock? That could be dumping gas into the vacuum line if the diaphragm is torn. That's a VERY common problem on these quads. How did you clean the pilot jet? I had to use very small drill bits on mine (like #90 and higher). I thought I had the 37.5 pilot clean until I saw the 35 pilot I had was bigger. So I had to drill it out again. Its amazing just how hard and tough that crud is that gas leaves behind. Its almost as hard as the brass! Guitar strings or bread ties make good jet cleaners. Also clean the little holes in the carb itself. Not just the jets. Those holes are hard to get to. A guitar string works good for that. For hard-starting issues I always verify the intake valve has enough lash. Its pretty well known how hard it is to start a cold engine if the intake valve has no clearance. Since you just rebuilt it and it ran for a while, I would check that 1st. If the valve is tight, then you have dirty air passing thru your filter. Now that the hardness is worn off the valve, this will happen more frequently until the valve is finally worn away and pulls thru the head. I've seen this a lot on these heads and its pretty much a given when one rolls in my shop.

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?