Cutting out | Scooter Doc Forum

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Cutting out by: rogerowen - Sept 29, 2014 12:21:07 GMT -6

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Post by rogerowen on Sept 29, 2014 12:21:07 GMT -6

My MBK Mach G 50 AC (AKA Yamaha Jog) had been sitting for a year or so, and wouldn't run due to flooding. I cleaned the carb and it ran better but would just die as I was riding along - never stopped completely, cut out for a bit then ran again for a while - then cut again..... and so on. I fitted new plug, plug cap, coil and lead and no difference. Oil tank is going down, and I've also poped some oil into the fuel for good measure. Anyone have any ideas what could be causing this cutting out?

jct842 PM jct842 jct842's Posts jct842's Threads Doc's Anything Goes Currently Offline Say no to scooter abuse Posts: 3,873 Likes: 155 Joined: Mar 31, 2010 19:07:16 GMT -6	Cutting out by: jct842 - Sept 29, 2014 14:02:48 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by jct842 on Sept 29, 2014 14:02:48 GMT -6 Gummed up carb, did you take completely apart and see that ALL the passages are clear?
	1983 Yamaha Riva 180cc 2009 kaw KLX250S

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Cutting out by: rogerowen - Sept 30, 2014 10:41:57 GMT -6

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Post by rogerowen on Sept 30, 2014 10:41:57 GMT -6

Gave the carb a pretty good clean, and blow through with compressed air. Float seemed to be working ok. Idle screw seem to need to be a long way out to stop the engine from racing at throttle off. A little bit of petrol coming up from cable entrance on carb top. Runs ok for a bit, then starts to cut. Struggles on hills, and often stalls at tick over - just like as if the ignition turned off. Sometimes it goes to stall but picks up again. All very frustrating!

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Cutting out by: Alleyoop - Sept 30, 2014 11:11:39 GMT -6

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Post by Alleyoop on Sept 30, 2014 11:11:39 GMT -6

It is getting to much fuel if fuel is coming out of the top by the throttle cable.
Turn the AIR SCREW 1/4 turn COUNTER CLOCKWISE, that is the SCREW near the AIR FILTER SIDE the one in the middle is your IDLE SPEED SCREW.
Alleyoop

..BAD TO THE BONE..

PST150H 62mm BBK, 60mm Crank, 16/37 Tranny Gears............................................... MOW-POWER

FROM THE BOOK OF KNOWLEDGE:
THE THINGS YOU DO FOR YOURSELF ARE GONE WHEN YOU DIE, BUT THE THINGS YOU DO FOR OTHERS REMAIN AS YOUR LEGACY.

Guitarman PM Guitarman Guitarman's Posts Guitarman's Threads Ad Free Donut Currently Offline A bike is music to my ears. Posts: 1,655 Likes: 93 Joined: Oct 22, 2013 4:11:04 GMT -6	Cutting out by: Guitarman - Sept 30, 2014 15:20:36 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Guitarman on Sept 30, 2014 15:20:36 GMT -6 Also, since it sat for so long, you should drain and clean the tank. It's likely got a lot of crud sitting in there that could be clogging you up as well.
	If you think everything is going your way, you obviously don't own a Chinese bike.

cyborg PM cyborg cyborg's Posts cyborg's Threads Forum Admin Currently Offline what i've learned is i'm still learning Posts: 6,404 Likes: 407 Joined: Nov 3, 2013 11:24:53 GMT -6	Cutting out by: cyborg - Sept 30, 2014 15:28:06 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by cyborg on Sept 30, 2014 15:28:06 GMT -6 yes i agree with guitar and Alley,,,change the gas and give the tank a good cleaning,,,and back off on the fuel delivery
	RIDE THEM LIKE YOU MEAN IT!

Alleyoop PM Alleyoop Alleyoop's Posts Alleyoop's Threads Forum Admin Currently Offline Posts: 13,815 Likes: 457 Joined: Mar 30, 2010 22:06:05 GMT -6	Cutting out by: Alleyoop - Sept 30, 2014 16:32:35 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Alleyoop on Sept 30, 2014 16:32:35 GMT -6 Be Careful who you take advice from some folks on here will tell you to use this method to adjust your carb. Alleyoop HOW TO ADJUST CARB
	..BAD TO THE BONE.. PST150H 62mm BBK, 60mm Crank, 16/37 Tranny Gears............................................... MOW-POWER FROM THE BOOK OF KNOWLEDGE: THE THINGS YOU DO FOR YOURSELF ARE GONE WHEN YOU DIE, BUT THE THINGS YOU DO FOR OTHERS REMAIN AS YOUR LEGACY.

jct842 PM jct842 jct842's Posts jct842's Threads Doc's Anything Goes Currently Offline Say no to scooter abuse Posts: 3,873 Likes: 155 Joined: Mar 31, 2010 19:07:16 GMT -6	Cutting out by: jct842 - Sept 30, 2014 17:14:50 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by jct842 on Sept 30, 2014 17:14:50 GMT -6 Would that werk with EFI?
	1983 Yamaha Riva 180cc 2009 kaw KLX250S

jct842 PM jct842 jct842's Posts jct842's Threads Doc's Anything Goes Currently Offline Say no to scooter abuse Posts: 3,873 Likes: 155 Joined: Mar 31, 2010 19:07:16 GMT -6	Cutting out by: jct842 - Sept 30, 2014 17:15:06 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by jct842 on Sept 30, 2014 17:15:06 GMT -6 Fix the screwing edit9
	Last Edit: Sept 30, 2014 17:17:29 GMT -6 by jct842 1983 Yamaha Riva 180cc 2009 kaw KLX250S

richardv PM richardv richardv's Posts richardv's Threads Doc's Anything Goes Currently Offline Posts: 1,226 Likes: 81 Joined: Apr 4, 2014 3:52:42 GMT -6	Cutting out by: richardv - Sept 30, 2014 18:21:08 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by richardv on Sept 30, 2014 18:21:08 GMT -6 Alley that is hilarious. Thanks I needed a laugh tonight.
	I believe on a quiet night, I can hear the fish laughing.

cyborg PM cyborg cyborg's Posts cyborg's Threads Forum Admin Currently Offline what i've learned is i'm still learning Posts: 6,404 Likes: 407 Joined: Nov 3, 2013 11:24:53 GMT -6	Cutting out by: cyborg - Sept 30, 2014 20:51:16 GMT -6 via mobile Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by cyborg on Sept 30, 2014 20:51:16 GMT -6 Kinda looks like Luke ,,, that's creepy
	RIDE THEM LIKE YOU MEAN IT!

rogerowen PM rogerowen rogerowen's Posts rogerowen's Threads Clinician Currently Offline Posts: 5 Likes: 0 Joined: Sept 29, 2014 8:55:50 GMT -6	Cutting out by: rogerowen - Oct 1, 2014 9:34:09 GMT -6 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by rogerowen on Oct 1, 2014 9:34:09 GMT -6 Thanks guys, I'll drain and clean the tank and the carb again and report back if it works.