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Post by PCBGY6 on Oct 25, 2013 13:20:42 GMT -5
Once again a friend has brought me her vino after I have told her I'm not very familiar with 2 strokes. The issue is the fuel delivery. I can spray starter fluid or squirt gas in the carb and it starts right up and runs for about 20-30 seconds. I pulled off the petcock and sucked on the air side and nothing. Thinking it might be the petcock I ran a fuel line straight to the carb so it would be gravity fed and still nothing. Now I'm confused as to which one it would be. Any tips and/or tricks to figure this issue out would be great.
PCB.
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Post by alleyoop on Oct 25, 2013 14:00:24 GMT -5
Does it have an Air Filter on it?
As far as the gravity fed setup it must not have any ups and downs going to the carb, straight shot downwards and not lower than the fuel inlet. Does the carb have an ENRICHER? If it does take it off and cover the hole with your thumb and see if it then sucks fuel in to start it. Also when you take the enricher off look at the Plunger it should be RETRACTED if it is extended replace it.
Look for air leaks or cracked intake manifold cracked air box etc..
When you start it can you keep it running giving it throttle?
It may be the carb is all clogged up and needs to be cleaned out.
Alleyoop
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Post by PCBGY6 on Oct 25, 2013 14:07:47 GMT -5
When I do get it to start it will idle and then die when giving it throttle unless I'm spraying fuel into the carb at the same time. No air filter to be found anywhere and she doesn't know what her and her ex did with it.
I haven't checked the other stuff yet. Will look at it again this afternoon.
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Post by alleyoop on Oct 25, 2013 15:09:06 GMT -5
Well your first problem is Put an Air filter on it, right now it is sucking into much air and limits the amount of fuel it sucks in. I Will bet if you cover the Air Intake side of the carb with part of your hand it wil start up.
Alleyoop
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Post by PCBGY6 on Oct 25, 2013 15:51:53 GMT -5
I got it to start and run and when i would give it throttle I would have to pick up one finger a little to give it enough air to keep running. It crazy how much the air flow on a two stroke can mess with it running or not. Totally different the the gy6 carbs.
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Post by alleyoop on Oct 25, 2013 15:56:28 GMT -5
Yep so slap on a Air Filter and then you can adjust the Carbs ratio to match the Amount of air it is getting in through the filter.
Alleyoop
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Post by PCBGY6 on Oct 25, 2013 16:30:38 GMT -5
Thanks for the information. Looks like the the intake manifold needs replaced also because it has some small cracks that may or may not be affecting it also.
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Post by PCBGY6 on Oct 25, 2013 18:43:31 GMT -5
Update on where I'm at with it.
Dumped gas tank because it was full of water and crap. Put one of my after market air filters on it just see if I could get is started. Now it starts easy and will idle. When I have it on the kickstand I can twist the throttle and it will rev up just fine. When I get on it and try to ride it loses all power under load. But i can let off the gas and it idles fine. I'm guessing the air/fuel mixture just needs corrected?
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Post by alleyoop on Oct 25, 2013 19:27:58 GMT -5
Yes it could just be running to rich and that will always lower the motors power.
Let it warm up idling then adjust the Fuel mixture to get the highest idle and if it then is idling to high lower the idle using the IDLE SPEED screw so the rear wheel is not spinning or just wants to spin and give that a shot.
Alleyoop
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Post by PCBGY6 on Oct 25, 2013 21:24:34 GMT -5
I moved the air/fuel mixture all over the place trying to find the sweet spot but I think the free flow air filter is just letting it it get to much air. Best I could do was get it to run about 10 mph. I'll pull the carb tomorrow to see what size jet it has.
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Post by alleyoop on Oct 25, 2013 21:31:53 GMT -5
You can also tape off some of the Free Flow Filter and keep taping little more and more until the fuel mixture can handle it.
Alleyoop
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Post by PCBGY6 on Oct 25, 2013 21:41:20 GMT -5
I'll try that in the morning. Sounds like a great tip.
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Post by alleyoop on Oct 25, 2013 21:59:27 GMT -5
Yea, close the Fuel Ratio Mixture screw then turn it out 2 1/2 turns then wrap a strip of tape around the end of the Filter about 1" give the throttle a quick Hit if it stumbles wrap another 1" off and you should get it pretty good that way. Until a twist of the throttle the rpms will climb quickly without any hesitation or bogging and drop down quick. If you get it to the point where it will almost take the full twist you can then try tweaking the fuel mixture because at that point it will be close.
Test the Mixture, Give the Throttle a quick full twist:
The RPMS should climb quickly without any hesitation or bogging.
A.
If the rpms drop below idle speed, then recovers (or stalls), it is RICH —Turn the Fuel Mixture Screw Clockwise ¼ turns at a time and try again.
B.
If the rpms do not drop quickly to the idle speed but hang and drop slowly it is LEAN —Turn the Fuel Mixture Screw Counter Clockwise ¼ turns at a time and try again.
Alleyoop
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Post by skuttadawg on Oct 25, 2013 23:16:21 GMT -5
I removed the airbox lid on a 4T and my 2T 50 just to see how it would run . They both started and would idle but they bogged so bad I did not get out of the driveway . When my 2T was new it ran perfect . Well one night I went for a ride , all was great but the next morning it would not start . With it being almost brand new and under a warranty I called me dealer after I make sure the sparkplug wire was on and I pulled the plug to see if it was firing which it was . He told me they had a scooter that ran great but would not start just like mine and had them baffled . They drained the gas tank and bowl on the carb , refilled it with gas without ethanol and tada it started . I did this and mine was new again . Bad gas with any water in can make one run bad or not at all .
Does it have a Teflon ( rubber ) intake ? If so these dry rot and will crack causing leaks making it not run good . My Honda CR125 had the intake get bad and if I sprayed starting pray on the intake while at idle it would stall so I knew for sure it was leaking . I would replace the Teflon intake with an aluminum one like Hoca or NCY brand with carbon fiber reeds .
A 2T with a carb you will have to adjust the idle speed as the seasons change . It should idle high on a cold start and idle at a lower RPM after it warms up . With any small engine , more so a 2T and when its cold outside let that puppy warm up prior to riding or making any adjustment to the carb . Mine would always start with just a bare sip of throttle but it did not like to idle for a long time , more so after a BBK and pipe . I replaced the 40 idle jet with a 45 and bang no idle issues or have to give it any throttle to start . Also check the vacuum hoses as if the crack or leak it will run bad
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Post by skuttadawg on Oct 25, 2013 23:18:53 GMT -5
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Main Jet
..BAD TO THE BONE..
