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Unread 02-24-2014, 07:36 PM   #21
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Default Re: intermittent dead cylinder issue- vanguard 23hp

ahh ok, thanks! thought i was going crazy.

well i came in after getting the carb back together and running it for 20-30 mins. i cant tell if i made a difference, i think my hands are playing tricks on me. gonna get back it at tomorrow after the motor cools off and i am 'fresh'
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Unread 02-25-2014, 11:14 AM   #22
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Default Re: intermittent dead cylinder issue- vanguard 23hp

Could be plugs or spark jumping down the outside of the plug. Carbon buildup can do crazy things sometimes. Or a bad insulator on a plug. Couple of fresh plugs and clean inside the plug boots?
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Unread 02-25-2014, 05:10 PM   #23
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Default Re: intermittent dead cylinder issue- vanguard 23hp

boots and plugs are new but i will get some new plugs and see if that helps.

jason
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Unread 02-27-2014, 08:19 AM   #24
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Default Re: intermittent dead cylinder issue- vanguard 23hp

havent had a chance to get new plugs yet but i will as soon as i can.

i dont think cleaning out the carb made much if any difference. it is still pretty hard to start and runs rough until the engine gets going. then once it is going it seems to backfire some and is not incredibly responsive. if i 'floor' the throttle it will just load up and choke out. is there anything downstream of the carb to clean out that maybe causing issue? i wouldnt think so, its typically carb > manifold > valves > cylinder but i am not familiar with these engines yet.

i wish there was still warranty left on the engine but i purchased it over 2 years ago... thats what i get for working too slow!

jason
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Unread 02-27-2014, 03:10 PM   #25
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Default Re: intermittent dead cylinder issue- vanguard 23hp

Have you removed the valve covers and checked the lash yet? That's free and should only take 5 minutes per side. Set them to .005 I'm wondering if you may have bent a pushrod or if maybe the valves are just WAYYY out of adjustment.
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Unread 02-27-2014, 04:07 PM   #26
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Default Re: intermittent dead cylinder issue- vanguard 23hp

Quote:
Originally Posted by Streetbu View Post
Have you removed the valve covers and checked the lash yet? That's free and should only take 5 minutes per side. Set them to .005 I'm wondering if you may have bent a pushrod or if maybe the valves are just WAYYY out of adjustment.
X2. Sure sounds like a valve not seating to me.
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Unread 02-27-2014, 05:40 PM   #27
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Default Re: intermittent dead cylinder issue- vanguard 23hp

yes i checked the valve lash, they are all set to .004.

i havent run this engine enough to even need an oil change and i certainly havent run this enough hard enough to bend a push rod! i watched all 4 valves open and close with the covers off the other day just to make sure and they all seem to be working normally.

its mainly backfiring through the exhaust but occasionally it backfires through the carb

Jason
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Unread 02-27-2014, 06:04 PM   #28
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Default Re: intermittent dead cylinder issue- vanguard 23hp

Are you sure it's just one cylinder? What do the plugs look like?
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Unread 02-27-2014, 07:37 PM   #29
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Default Re: intermittent dead cylinder issue- vanguard 23hp

at this point i am not really sure of anything. the plug is a lil black on the ends but its not that bad. there is certainly no build up or anything just some discoloration.

jason
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Unread 02-27-2014, 07:49 PM   #30
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Default Re: intermittent dead cylinder issue- vanguard 23hp

Backfiring in the exhaust usually means too much fuel. Find out if it is both cylinders or just one. If the vanny is hitting on just one cylinder, it will be very hard to tell. It will sound almost the same, but be low on power. It will be a totally different troubleshooting strategy if it is both cylinders vs just one.
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