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V-twin Honda mower won’t run when warm. |
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steve(ill)
Orange Level Access Joined: 11 Sep 2009 Location: illinois Points: 77241 |
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Fuel line comes out of the top of the tank ang runs in front of the moto
so it does work off some type of vacuum sysyem or fuel pump suction... and not gravity feed... that could be a clue..
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Like them all, but love the "B"s.
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TramwayGuy
Orange Level Access Joined: 19 Jan 2010 Location: Northern NY Points: 11132 |
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If there is a restriction at the tank feed line, there could be a vacuum buildup and gasoline will ‘boil’ at a lower point than at atmospheric pressure.
Also, using winter blend gasoline can also cause problems if used in summer… |
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Thad in AR.
Orange Level Access Joined: 12 Sep 2009 Location: Arkansas Points: 9263 |
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It is supplied by a plastic vacuum operated fuel pump. I’ve removed, inspected and cleaned all the fuel lines and fuel pump. I started it with the fuel line to carb in a jug. It pumped a steady stream. I removed the pump, cleaned it and put vacuum to it. I found no vacuum leakage. |
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Thad in AR.
Orange Level Access Joined: 12 Sep 2009 Location: Arkansas Points: 9263 |
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Tram you really have me thinking. Last winter when gas prices started going up. I went and filled every can on the property. The successful run I had with the mower was with fresh non e gas that I had just bought that morning. It was also cooler that day. When at its worst was with the winter bought gas. Edited by Thad in AR. - 21 May 2022 at 6:41am |
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jaybmiller
Orange Level Access Joined: 12 Sep 2009 Location: Greensville,Ont Points: 21334 |
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Assuming pump gets it's vacuum from a valve cover..... are the bolts securing the valve cover tight ? Any oil drips from that cover ? Going far out on a limb but.... as then engine heats up, valve cover becomes 'loose' from head, loss of vacuum, loss of gas, engine stops. when it all cools down...'runs fine'. hay, I only got so many straws left !
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
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Thad in AR.
Orange Level Access Joined: 12 Sep 2009 Location: Arkansas Points: 9263 |
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Jay it draws vacuum from a barn on the intake. Valve covers were tight when I removed them to check valves. Yhey have very nice well made gaskets. May check intake bolts??? Hondas seem to be well machined with good seal ability. I’ll keep checking. |
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fixer1958
Orange Level Joined: 13 Feb 2010 Location: kansas Points: 2435 |
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Where is the ignition pickup on that?
I had an Onan that did that and was on the crank behind the flywheel. Get hot and start doing what you described. You can learn to hate something very quickly. Edited by fixer1958 - 21 May 2022 at 7:27am |
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BrianC
Orange Level Joined: 16 Jun 2011 Location: New York Points: 1612 |
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A favorite diagnostic tool is a can of ether. When it dies, right away give it a snort of ether and see if you get some action. Fuel was winter blend, how old is it? 4 months, or the previous year, 16 months? Anyone know what old gas symptoms look like? What make, year, model # is this mower? That will help for using internet search about this issue. |
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jaybmiller
Orange Level Access Joined: 12 Sep 2009 Location: Greensville,Ont Points: 21334 |
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re: Jay it draws vacuum from a barn on the intake. **** well I know this is a 'farming website'..... I'll assume 'spellcheck' or 'phatphingers', hehehe ok, maybe 'google' your engine/ dies when hot to see if it's a common problem ??
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
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Thad in AR.
Orange Level Access Joined: 12 Sep 2009 Location: Arkansas Points: 9263 |
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Vacuum port. Was supposed to say barb. |
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Thad in AR.
Orange Level Access Joined: 12 Sep 2009 Location: Arkansas Points: 9263 |
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I have not pulled the flywheel. I figured everything was charging related under there. These coils each have a 4 prong plug plus the coil/spark plug wire. |
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Kansas99
Orange Level Access Joined: 26 Feb 2015 Location: W Kansas Points: 4790 |
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Interesting I never knew that, would explain why a electric fuel pump at the tank will take care of vapor lock problems sometimes. I guess it’s same principle as boiling water at room temperature. Pulling a vacuum. Edited by Kansas99 - 21 May 2022 at 8:31am |
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"LET"S GO BRANDON!!"
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Thad in AR.
Orange Level Access Joined: 12 Sep 2009 Location: Arkansas Points: 9263 |
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Cub Cadet 17AGACACN56 Honda GXV 630 688cc. |
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fixer1958
Orange Level Joined: 13 Feb 2010 Location: kansas Points: 2435 |
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I see what you have now. Not the same as that POS Onan.
Possibly be a fuel line sucking air some place. Maybe opening up a little when hot. I have had one collapse before internally and not see it. It was an automotive style low pressure fuel line on my WD line from the tank to the carb.
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Thad in AR.
Orange Level Access Joined: 12 Sep 2009 Location: Arkansas Points: 9263 |
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Been giving this some thought |
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steve(ill)
Orange Level Access Joined: 11 Sep 2009 Location: illinois Points: 77241 |
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there are some electric fuel pumps that put out 2 psi and go inline from the tank to the carb... they only cost $15. ......... used on a lot of mowers.
Edited by steve(ill) - 21 May 2022 at 12:31pm |
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Like them all, but love the "B"s.
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Dave H
Orange Level Joined: 11 Sep 2009 Location: Central IL Points: 3476 |
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Since we are fishing, I would ohm out those coil packs when it won't run, especially the weak/dead side. Highly unlike;y but I have seen new parts right out of the box bad.
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Thad in AR.
Orange Level Access Joined: 12 Sep 2009 Location: Arkansas Points: 9263 |
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I wish I knew how? These have 4 prong plugs. I’ve tried to figure out just how these work with no success. I tried them like a common old coil but got nothing. |
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fixer1958
Orange Level Joined: 13 Feb 2010 Location: kansas Points: 2435 |
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Well if it still does the same thing changing all those parts it's likely not the problem.
Step back a little and ask the great white buffalo for a clue. Seriously though, I think when you do figure it out it may be something stupid. Has happened to me before.
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Thad in AR.
Orange Level Access Joined: 12 Sep 2009 Location: Arkansas Points: 9263 |
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Oh I assure you stupid has already kicked in. I should have found a way to test those very expensive coils before I bought them. I took it to a supposed reputable shop to get this figured out. He said he had no way to test coils. After a few questions I found. Him to be an oil changer and no more experienced in this than I and at $80.00 an hour I had to bring it back home. Not knocking the guy or his prices just that he can’t figure this out and told me so. I actually appreciate his honesty. And yes I’m sure this is gonna be something simple. |
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Riprock
Bronze Level Access Joined: 13 Feb 2021 Location: Tennessee Points: 21 |
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Do you have the service manual? I did a search and zoomed in on the cover and noticed it shows the carb has a plastic screen inside the fuel inlet. I ran into that many years ago on a kerosene blow type heater. It would run awhile and then run out of fuel, let it sit and it would run again, for awhile.
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HudCo
Orange Level Joined: 29 Jan 2013 Location: Plymouth Utah Points: 3236 |
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i do not know what honda engine that you have but honda rt 5000 compact tractor has a plain gx 390 except for one thing it has a cdi box to control the spark , if it starts going bad it will cause the same problems , i know this for a fact because we over hauled one for a guy about eight years ago becaucse a regular honda engine will not bolt or fit in the tractor , about three years ago he had cdi problems a guy in new york will send a rebiult one if you send him your bad one
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Thad in AR.
Orange Level Access Joined: 12 Sep 2009 Location: Arkansas Points: 9263 |
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The little screen is removed at the moment. It didn’t help. |
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Thad in AR.
Orange Level Access Joined: 12 Sep 2009 Location: Arkansas Points: 9263 |
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This is a Honda GXV630RH QAMT Book says CDI variable timing. I’m not box I can find is the regulator/rectifier. It also has two relays in line with the rectifier. |
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jaybmiller
Orange Level Access Joined: 12 Sep 2009 Location: Greensville,Ont Points: 21334 |
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this !!!!! These have 4 prong plugs. !!!!!!! HUGE RED FLAG !!! I had a Cub here,Kohler powered,same idea though.... the 'electronic' magnetos can (will...) overheat and eventualy die. Kphler's fix ( only used 2-3 years) was to disco the part and go back to ,yup, OLD SKOOL mags. They even sell a 'rework' kit(2 mags and a wire...). You need to check Honda's website for specific 'tech bulletins' on your engine. It'd be interesting to see if they still sell that engine with that style mag. I strongly suspect heat is 'altering' the 'electronic magneto pack' and it's shutting down. My 'fix' for the Cub here was to sell ,at a low price with FULL DISCLOSURE of the problem, and link to new mag kit.
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
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Thad in AR.
Orange Level Access Joined: 12 Sep 2009 Location: Arkansas Points: 9263 |
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Sure wondering if I could put old non electronic coils on this? I have too much time in it to give in. Jenny may not think this way. |
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jaybmiller
Orange Level Access Joined: 12 Sep 2009 Location: Greensville,Ont Points: 21334 |
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has a very quick look on the net,googling .... Honda GXV630RH QAMT found this.... seems there's TWO coils $98 vs $155. My guess is the 'cheap' one is 'normal', the 'expensive ' one is electronic..... Use your engine model info and snoop around.... google the honda coil numbers from that site to see what they are it's nice outside, I wanna go play...... HTH Jay
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
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BrianC
Orange Level Joined: 16 Jun 2011 Location: New York Points: 1612 |
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Ignition coil issues, look around for this pdf:
GX690-Ignition-Coil-Bulletin.pdf |
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Thad in AR.
Orange Level Access Joined: 12 Sep 2009 Location: Arkansas Points: 9263 |
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I got put in contact with a guy yesterday who swears this will be the fuel solenoid.
He told me a couple more tests to try. He thinks heat is getting to it and it gets weak the hotter it gets. I may run it without it one time just to see. |
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jaybmiller
Orange Level Access Joined: 12 Sep 2009 Location: Greensville,Ont Points: 21334 |
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had a look.... #1 in the right dwg... /carburetor .. hopefully you CAN remove and plumb up a 'bypass'...... Kohlers were(are?) bad for 'gumming' up the innerds of the solenoid valve(varnish from E10 gas...). quik test is to remove the rubber tip and reinstall it. no rubber, no stopping the gas.. I may have said all this before ?? |
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
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