New Year's project, King Quad resurrection.
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On the carb, right front, the nylon one, that's vacuum and goes to the fuel tap and, if there isn't another vacuum port on the inlet manifold, gets branched off to the pump as well. If there is a manifold fitting it's for the pump. Right rear of the carby is the bowl breather, and the left rear is fuel in.
On my old bike the battery breather hose dropped out near the front A arm..
I'll see if I can find a picture of the hoses.. I've seen one somewhere.
On my old bike the battery breather hose dropped out near the front A arm..
I'll see if I can find a picture of the hoses.. I've seen one somewhere.
Nope, don't have a picture of that carb on that bike. Lots of other combinations though.
They have a carb overflow that runs down the back of the motor, and a front diff and rear brake breathers that both run up near the front of the tank, and a battery vent that goes down near the front of the bike, and crankcase vents that branch to the airbox and that tube near the tank that has a T fitting in the end, and the engine breathers normally have a restriction in the branch of the breather that goes to the airbox.
I've never seen it, but could it be that the front drum brakes have a breather ? They had a seal between the drum and the backing plate(which never lasted long).
They have a carb overflow that runs down the back of the motor, and a front diff and rear brake breathers that both run up near the front of the tank, and a battery vent that goes down near the front of the bike, and crankcase vents that branch to the airbox and that tube near the tank that has a T fitting in the end, and the engine breathers normally have a restriction in the branch of the breather that goes to the airbox.
I've never seen it, but could it be that the front drum brakes have a breather ? They had a seal between the drum and the backing plate(which never lasted long).
OK so I got it all screwed up. I will move the petcock to the nylon port. I didn't see anything on the intake boot, and the parts diagram doesn't show one. The fuel supply is correct. The fuel inlet is lower on the carb. There are two ports on the top rear. Both vents?
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Could the two brass vents on the top behind the diaphragm cover be vent and overflow? I thought the brakes for those two as well but there aren't any niples or spare backing plate holes I can see. Am I thinking the tube off right above the bowl is fuel in but thays actually the overflow?
Don't know about two fittings at the right rear top.. I've got an old carb that looks like yours, off an old LT250, but it only has one vent at the right rear top. I've got two LT300 carbs too.. none quite like that though.
Despite what the manuals say and show, we get differences here..
Try blowing down the two and see where the air comes out.. One might be vacuum for the pump.. maybe.
Despite what the manuals say and show, we get differences here..
Try blowing down the two and see where the air comes out.. One might be vacuum for the pump.. maybe.
Fuel pump vacuum hoses are normally bigger than the fuel tap vacuum hoses.. I've had the pump hoses on small fittings and the pumps don't work right.. The pump has to have at least about four mills through the fitting or it's not enough. It's normally a six mill/ !/4"" hose.
And I've seen skinny little vent hoses on the back top there, and fat ones too.. On different models.. both vents though.
And I've seen skinny little vent hoses on the back top there, and fat ones too.. On different models.. both vents though.
I couldn't make out the numbers, yeah Mikuni. Getting late so I'll pull it back off tomorrow and blow on it. 😀 Enjoy your brew. I'm out. When I get all this figured out I'm going to draw up a diagram to hopefully help the next person. I understand all the driveline and rear brake vent crap. And the battery drain was long gone. Agm going back in so that's not an issue.
No they're in another barn and have all the plastics on. Thanks for the help.
I've searched every LT250 and 300 manual I have, and for years and years of them.. the nearest carb is on older 250 they all in the hose routing diagrams and close up pictures of the carb all just show one right rear top vent.
Hopefully one of the other bikes will have it's plumbing intact..
Hopefully one of the other bikes will have it's plumbing intact..
Went to the local shop that just opened. Fellas were very helpful. The two little hoses under the tank were indeed front brake vents, just hadn't noticed the nipples. The pump and petcock went to the cylinder side of the carb. Petcock to the nylon barb, fuel pump to the steel barb. On the filter side above the inlet bell, one brass port for overflow, the other for atmospheric vent. Don't know which is which. One of them leads to the tee shown, don't see anything else to hook to the tee so it'll just be left there. Fuel supply goes to the steel barb situated low on the left side of carb over the bowl.
Thanks for the help y'all.
Thanks for the help y'all.
Yeah that's what I thought too. How's it supposed to go uphill? The only thing left to put a hose on is the bowl drain. This is the one off the 250 Quadrunner, the only difference is the addition of a port where my thumbs pointing on the 300.
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Yeah dunno... don't believe I've seen one like you have.. with two rear breathers.
When you put the bowl drain hose on try blowing up it. I suspect it will have a tube going up above the float level but low enough to drain fuel before it runs into the venturi.. It doubles as an overflow and then a drain when you undo the drain screw on some bikes..
When you put the bowl drain hose on try blowing up it. I suspect it will have a tube going up above the float level but low enough to drain fuel before it runs into the venturi.. It doubles as an overflow and then a drain when you undo the drain screw on some bikes..
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