Yamaha QT 50 Carb Question UPDATED! By gbtr6 (Read 4,096 times)

[gbtr6]

Hi,

I am working on my sons Yamaha QT-50. Put on a new carb, lube the cables, new battery. It's been sitting and I am getting it going again. One question though. On the carb, there is a tube that runs from the bottom of the float chamber and I'm not sure where it goes. It's the pink tube in the picture. I think I have the gas and oil lines right. Please let me know if any one out there knows. I haven't had a chance to work on it til now. Taking it apart and cleaning then it sat.

Thanks,
Perry

Attachments:

[jct842]

It goes to a bracket off one of the side case screws. It is the drain for the carb. When it is going to sit for a while you are supposed to use it to drain the carb. Probably what did not get done before the scooter sat hence the carb replacement. Ethanol kills carbs.

[Alleyoop]

Most on those they just hang down in front of the cvt, the ones that have a wire wrapped around them with the drain screw on the end of them usually have a bracket to hold it.
Alleyoop

[gbtr6]

Thanks for the replies. I didn't know what that tube was. Is anyone able to verify that I have the oil line and gas line correct? I'm almost 99.9% sure I do, but just in case.

[Alleyoop]

HAHAHA, if you did not have them correct it would not run. The thin black hose is your OIL hose.
Alleyoop

[LUKE]

don't worry about that line undrneath the carb chamber thingie, it's just there to direct the gas to a container when you needed to drain the carb, otherwise it's just there hanging like a horse's dck..LOL..., in human body it's kinda like the appendix, it's just there for whatever. not too much use... overall,you'll be fine sir.


ahhh!!!, good thing i no longer have to deal with carbs, floats,petcocks,breather,tuning,hi and low idle whatevers. thanks to my mighty morph!! joyride all the time!!


maintenance free !!

[gbtr6]

Thanks again for the replies. Now, a new question. I put some oil in the tank, gas in it, changed oil in the crank, and it runs. And runs well. I haven't even adjusted the carb yet. But... it pushes a lot of oil out of the exhaust. It can only come from 2 places. Are these sensitive to crank overfill? It is burning oil, as it should. I imagine the auto-lube pump could be the problem, but I didn't do anything to it and it functioned well before. Any suggestions?

Thanks,
Perry

[Alleyoop]

Wait a minute where did you add OIL IN, this is a 2 stroke and it has the oil injection system. So you should be filling the OIL TANK only with oil.

Any way check your throttle cable it may have a Y cable on it one for the OIL Injector and one for the Throttle. If it is to much oil lengthen the OIL cable a little to feed it a little less oil.
Alleyoop

[LUKE]

ok, wait , i need to butt in. if your scooter is a 2 stroke, it's ok to put a little amount of 2stroke oil in it, i mean little amount ok.. do not put too much,you might foul the plug. , back in the days, when me and my wifey do some 30mile trip on my 2stroke 50cc honda dio, i always mix oil with gas, for added lubrication, you never know your injector might quit functioning ,it's good to have oil mix with gas to prevent galling and cease shyet!, it might smoke a little but it's ok, back in asia, we have instilled in our minds that the more smoke that comes out of a 2stroke engine the better and the longer the engine will last because it's well lubricated.,plus pollution over is no big deal, i can burn leaves,wood etc in my backyard and nobody will complain, HERE? OMG, i was just cooking barbecue in my backyard and the sheriff knock on my door and ask where is the smoke coming from because neighbors were complaining,..pak,shyet!! ahhh talking about freedom! shyet!, i want to have a pet rooster but i cant beause neighbors will complain again about the rooster crows in the morning,, OMG! what a life!!!, can i tell the rooster not to crow?? cummon neighbors,be logical,shyet!
ok, back to the topic...
you can prolly add 5ml of 2stroke oil in you one full tank of gas. that's what i do. and it worked for me.
good luck,,,sorry for the vent.




ahhhhh! American Dream!!!!!!!!

and nope, i don't wanna go back to asia anymore...i knew your'e gonna say that..


btw , all my three neighbors are white ooooops , i'm just saying

[kz1000st]

Until it gets hot it will push oil out the exhaust. You'd know if there was too much oil, the plug would foul. Also did you put motorcycle two stroke oil in the injector tank. Those of us who had two stroke bikes back in the 70s' learned very quickly what would happen with the wrong oil. Plug fouling and carbon clogging-everywhere- quickly ensued.

Heck even with the right oil it will push oil out. I used to love spraying smoke and oil on Harley Sporsters as I blew by them, coating their chrome with oil droplets and haze. Good times.

[gbtr6]

Thanks for the replies. I put oil in the tank for the injection. i used a syntetic 2 cycle oil. That may be a problem. The other oil was the crankcase, and I may have over filled it a bit. Didn't overflow, but maybe a bit over. Thats why I wonder if they are sensitive to the crank case oil level. Now that I think about it, is that the gearbox? Anyway, it pushs out probably a teaspoon of oil. It wasn't warmed up yet so it may stop. It runs well, no sputtering, good power. I need to check the plug to see if it's fouling. I don't think thats an issue. It may just be temporary.

Thanks,
Perry

[Alleyoop]

That makes more sense THE GEARBOX. But that does not go through the combustion chamber the only thing if you over filled it would squirt out of the vent tube that is all.
Alleyoop

[gbtr6]

I realized that as I was posting. I'm not used to 2 cycles. But, the oil I put in goes in the plug on the top of the right hand side of the case, and if the case is open to the bottom of the crank, isn't it possible it could scavenge some oil to the piston and out the exhaust side?

Perry

[Kaveman]

Just a few words : running a 2 cycle engine too rich in the carb fuel air settings also will foul out a plug . Running rich does keep the engine from getting as hot tempwise as if it was leaned out too much !
;D willc. ;D

[Alleyoop]

The oil injection drips drops of oil to mix with the gas as you open the throttle. If the adjustment on the OIL INJECTION is to much TO much oil gets sucked out to mix with gas that is is sucking out of the carb and it will be thrown out and not burned.

Like I said check your throttle cable and see if the throttle cable is a "Y" CABLE which ONE LEG of the "Y" controls the OIL INJECTOR.
Alleyoop