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16-02-2020, 12:31 PM | #1 | ||
DIY Tragic
Join Date: Apr 2018
Location: Sydney, more than not. I hate it.
Posts: 22,356
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I’ve had this one for years, I think the usage pattern could be described as “light professional”. Overall it’s in good condition but this morning developed a fault.
Primed up as normal, started (on choke) second or third pull, I went to put it on the grass to idle up for 30 seconds before choke off and using. As I went to sit it down, it slightly revved up and stopped. No amount of attempts then or later could restart it, starting fluid didn’t seem to change this either, nor a cleaning and re-oiling of the filter panel. I tested the basic way (screwdriver stuck in the plug boot, grasp while gently pulling the starter cord) for spark impulse and it seems to be there. I store these types of gear tank-down in an effort to keep the gaskets from getting too dry. What I have now noticed, is the primer bulb never seems to fully purge the lines of air. I don’t know if this is a new or normal occurrence. Looking for experienced input, what sort of coil readings should I expect, and if they’re within spec should I go with a Chinese carb or a gasket kit? Ta in advance for any pointers here. |
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16-02-2020, 12:37 PM | #2 | ||
Cabover nut
Join Date: Aug 2015
Location: Onsite Eastcoast
Posts: 11,270
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Did you turn the fuel tap to off accidently like I did with a genset. Left the fuel T tap in the on position when it was last used it, so naturally did the opposite when I restarted at a later date.
Stupid things you do eh.
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16-02-2020, 12:44 PM | #3 | ||
DIY Tragic
Join Date: Apr 2018
Location: Sydney, more than not. I hate it.
Posts: 22,356
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Classic, have confused myself that way on countless mowers.
This trimmer doesn’t have a separate fuel tap, fortunately. |
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16-02-2020, 12:49 PM | #4 | ||
Cabover nut
Join Date: Aug 2015
Location: Onsite Eastcoast
Posts: 11,270
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Even marked arrows on it. and missed it.
CB Mr.:4:. will know. Edit could be a float problem. Happened after you moved it.
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heritagestonemason.com/Fordlouisvillerestoration In order that the labour of centuries past may not be in vain during the centuries to come...... D. Diderot 1752
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16-02-2020, 01:16 PM | #6 | ||
DIY Tragic
Join Date: Apr 2018
Location: Sydney, more than not. I hate it.
Posts: 22,356
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That was my gut instinct too; fuel starvation due to lack of it pumping. I may have simply over-applied the starting fluid and gone too rich for ignition.
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16-02-2020, 01:28 PM | #7 | ||
FG XR6 Ute & Sedan
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 23,387
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Did you store it with fuel in, or did you empty it and run it until it stopped from fuel starvation as is usually recommended in the owners handbook? If stored full of fuel the outcome is usually a gummed up carburettor.
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regards Blue |
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16-02-2020, 01:40 PM | #8 | ||
DIY Tragic
Join Date: Apr 2018
Location: Sydney, more than not. I hate it.
Posts: 22,356
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I have stored it fully fuelled since 2008. The only other problems I’ve had with it were directly traced to bad fuel; once drained and replaced it ran perfectly it again.
The only gumming up issues I’ve had with gear, have been from vege bar oil in chainsaws, and from E10 causing oxidisation and sticking in float bowl needle valves. |
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16-02-2020, 01:59 PM | #9 | ||
Kicking back
Join Date: Dec 2013
Location: Western sydney
Posts: 8,675
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If it starts and runs on choke but dies off choke i would investigate a vaccum leak behind the carby. Last time i had an issue very similar to what you explained it was a bad carby gasket. Typically around that area it will get dirty as sitting fuel leaks a little and dirt sticks to that. Pull the carb and check the gasket. If its only a minor vaccum leak a light smear of gasket maker will get it going again.
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16-02-2020, 02:18 PM | #10 | |||
FG XR6 Ute & Sedan
Join Date: Oct 2006
Location: Bibra Lake WA
Posts: 23,387
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Quote:
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regards Blue |
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16-02-2020, 05:59 PM | #11 | ||
FF.Com.Au Hardcore
Join Date: Aug 2016
Posts: 895
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Is the fuel tank breather blocked.
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16-02-2020, 06:39 PM | #12 | ||
DIY Tragic
Join Date: Apr 2018
Location: Sydney, more than not. I hate it.
Posts: 22,356
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I don’t think so, I tried to prime it with the tank cap both loose and tight. The feel of the priming bulb is somehow not right.
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16-02-2020, 06:42 PM | #13 | ||
FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Sth Coast NSW
Posts: 1,512
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I've got a 4 stroke mower - but my two stroke Victa refuses to die, usually the only problem it has is the spark plug - they oil up. It'll kick, run and stop. Cleaning is usually not a long term thing, it's easier to replace it, and I'm on my way. So try that.
Remove your primer bulb and make sure it has proper pressure and vacuum - the bulb can split with age, reducing both, and a split can suck air while it's running. |
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16-02-2020, 07:15 PM | #14 | ||
FF.Com.Au Hardcore
Join Date: Apr 2008
Posts: 5,464
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Hi. A bit like my ryobi trimmer, the plastic fuel line breaks down and cracks just inside where it goes into the tank. Local mower shop or bunnings should have a repair kit with both supply (plastic) and return (Rubber) hoses and a weighted filter to go on the end of the supply hose in the tank. ( https://www.bunnings.com.au/ryobi-fu...p-kit_p3410082 ). About $20 and half an hour and you still get time for a beer after. Cheers MD
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16-02-2020, 07:22 PM | #15 | ||
FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Sth Coast NSW
Posts: 1,512
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Yeah, have to pick one up for my Ryobi - should fit a Walbro carby I'd say.
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16-02-2020, 07:59 PM | #16 | ||
FF.Com.Au Hardcore
Join Date: Apr 2008
Posts: 5,464
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Hi. That kit I mentioned up there somewhere ^^^^^^^^^^^^^^^^^^^^^ also has a primer bulb to suit the ryobi carb. Cheers MD
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HI I'M MICHAEL 2003 ACID RUSH BA FUTURA WAGON light up window switches | auto on cruise control | doubleclick window lift from remote |
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16-02-2020, 08:53 PM | #17 | ||
Kicking back
Join Date: Dec 2013
Location: Western sydney
Posts: 8,675
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A primer bulb isnt an expensive maintenance thing, so maybe that for a start, but i still reckon theres un metered air getting in behind the carb somewhere. Basic 2 strokes only need air, fuel and spark to run. Unless theres too much or not enough fuel, no spark or more air then that carb can deal with, it should run. A split primer, fuel line or return line will leak.
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17-02-2020, 09:26 AM | #18 | ||
DIY Tragic
Join Date: Apr 2018
Location: Sydney, more than not. I hate it.
Posts: 22,356
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Just for certainty, I tested the coil. Primary 0.6 ohms, secondary 5.9K. Seems good enough in the absence of hard data. It’s not a cap or breaker point ignition, just magneto like the old Victas.
Shutoff switch also tests correctly. I’m inclined to try a new plug next in case the insulator has a fine crack. If still no go, I can move focus exclusively to the fuelling. |
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17-02-2020, 05:10 PM | #19 | ||
DIY Tragic
Join Date: Apr 2018
Location: Sydney, more than not. I hate it.
Posts: 22,356
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New plug, and off she went on the second pull.
$5.91 from Repco, very happy to have a result. Suspect a cracked insulator from rolling around in the tray. |
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