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Post by mftic on Sept 20, 2014 13:24:28 GMT -5
Just signed up since the wife bought herself a MD50QT-5 that doesn't run. Sucks cause it's only got 35 miles on it. Previous owner must have tinkered with it too much I guess. Been reading-reading-reading, haven't gotten anywhere yet..LOL.
*must be fuel problem since it will start and idle, just give it gas and it will die. Haven't figured out how to remove the carb yet since it's got some sort of hose covered in spring attached on bottom and no way i'm assuming to remove the wires from carb end.
sigh, give me a yz250 anyday to work on
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Post by gatekeeper on Sept 20, 2014 13:56:38 GMT -5
Welcome to the forum. Where at in Washington are you? If you aren't too far from me I wouldn't mind giving you a hand. It sounds like the main jet in the carb is gunked up, not letting fuel pass. The carb needs to come off and be thoroughly cleaned. Or you can get a new one off Ebay for under $25.00 shipped. The advantage to that is that the air/fuel mixture screw won't have a brass plug covering it, making adjustments easy. New carb: www.ebay.com/itm/280875327579?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649How to clean carb: |
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Post by mftic on Sept 20, 2014 14:49:57 GMT -5
Thanks for the video (i'll probably watch it a few times lol). I've cleaned a carb before, it's just setting the float height which i REALLY suck at. Guess I should go out there and see if I can't remove it to work on it. Haven't figured out what that bottom hose thing is yet.
Kirkland, wa
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Post by gatekeeper on Sept 20, 2014 15:08:00 GMT -5
Hmm, Kirkland is a ways from Shelton. Bummer.
The hose you're talking about is a drain hose for the carb bowl. There is a screw in the bottom of the metal fitting at the end of the hose you use to drain the carb. These screws often vibrate loose, letting your carb drain as you drive down the road. Secure it with a gob of silicon sealent so it doesn't vibrate loose. It takes the place of the drain screw that used to be on the bottom of the bowl. The metal fitting at the end of the hose is usually mounted with a bolt to the CVT cover. Just take that bolt out then leave the hose connected to the carb as you pull the carb out of the engine bay.
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Post by mftic on Sept 20, 2014 15:53:17 GMT -5
LOL...perfect. Got the carb off and ran down to the store for some cleaner..HMOG! Never have I seen so much crystallization in a carb...everywhere.
crap wife is home, errand time
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Post by gatekeeper on Sept 20, 2014 16:36:42 GMT -5
Ya that's how I get my best deals. "Gee it won't run!" Talk them down, clean the carb and it runs like new! With only 35 miles on it your wife is going to have a great scooter!  |
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Post by mftic on Sept 20, 2014 19:38:58 GMT -5
SHE LIIIIIIVEEEEEESSSSSSSSSSS 
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Post by mftic on Sept 20, 2014 19:51:34 GMT -5
Last (2) question(s) for the night. Where is a good place to put this thing? I'm gonna just ziptie it out of the way for now. And also, as soon as it starts it want's to take off!!! How do you adjust it sits still at idle...LOL  |
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Post by gatekeeper on Sept 21, 2014 1:41:18 GMT -5
If that thing has a third hose coming out of it then it is the vacuum operated fuel petcock. It just needs to be attached to the frame somewhere so that the fuel lines follow a steady decline from the tank to the carb without any ups and downs. If it just has the two hoses that I can see it is probably a check valve for the tank vent. Regardless just attach it to the frame.
For the idle there is an adjustment screw located just forward of where the throttle cable attaches on the carb. Turning it counterclockwise will lower the idle. If you have a tachometer set the idle at 1800 to 2000 RPM. If no tach just set it so the rear wheel doesn't turn. While on the center stand at proper idle the rear wheel may "bump" a bit but that's OK if you can hold it in place without a drop in idle speed. Do the adjustment after the engine is warmed up. That way the auto enricher "choke" will have cut off the extra fuel flow needed for cold starting.
Congrats on getting it going!
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Post by mftic on Sept 21, 2014 11:29:48 GMT -5
So the idle is the way to keep it from moving? Interesting. Hopefully I can go get her running perfect to show the wife today. Already got points for not going out this morning now for some extra points  |
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Post by mftic on Sept 21, 2014 11:54:03 GMT -5
Hmmm...Gonna need a picture of said idle screw I'm thinking as I don't remember a screw when I had the carb off. You're not talking about the screw that adj. where the throttle cable comes to rest are you.
*2 other things.
Must have had a kink in the throttle cable or something cause as I was looking at it, I noticed it wasn't closed...about half open. Not really sure what it was as I loosened at the hand control and also at the carb, fiddled with it and tightened everything back up. Now it's closed/where it should be.
EDIT *--when I turn the bars it moves the cable. Now I gotta take all this crap back off and find the problem.
Lastly...I REALLY apologize for my intro thread turning into a help thread. Not sure who the mods/owners are but please take whatever action you deem appropriate.
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Post by gatekeeper on Sept 21, 2014 13:44:44 GMT -5
This is the idle set screw:  |
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Post by gatekeeper on Sept 21, 2014 13:52:33 GMT -5
Check the cable routing. Make sure it is taking the most direct route to the carb. Of the two adjustment points, the one where the cable attaches to the carb is used to make big adjustments. The point at the throttle is used to make minute adjustments. At the carb attach end, loosen the top nut and slide the cable barrel down thru the bracket until there is no tension on the inner cable, then tighten the lower nut. Watch as you turn the handle bars from side to side. There should be no tension occurring on the inner cable at the carb attach point.
Once adjusted properly you should have about 1/8 to 1/4 of an inch of free play when starting to turn the throttle before the cable starts to move.
Take time out to watch the Seahawks game!
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Post by mftic on Sept 21, 2014 17:11:34 GMT -5
Wife returning from around the neighborhood.  Heck yes I'm watching the game  |
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Post by gatekeeper on Sept 21, 2014 22:15:35 GMT -5
I like her shirt! It was a great game!! I stopped breathing at the end of the 4th quarter. |
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