Cold front cyl, Oily plug, Crud in coolant. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 13 (permalink) Old 02-21-2017, 07:46 PM Thread Starter
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Question Cold front cyl, Oily plug, Crud in coolant.

2005 with 19k isn't firing on the front. I got the bike cheap because the final drive was chewed up. Carbs and tank were full of sh*t from sitting. Got that sorted. There was also a big grommet jamming the front slide. Rear had a rusty plug, replaced as well. Then there was more carb crud from it sitting since last fall.

Now I can't get the damn thing to run right. It usually barely runs for a second then shuts off. Choke helps sometimes and keeps it running if I keep it over 3000 RPM.
  • Has spark despite igniter failing every single test on the chart of what, 30+ combinations? I think the chart is wrong for my year.
  • Float levels are good enough.
  • There's a little greasy crud in coolant reservoir and the cap near the t-stat. Not much.
  • No fluid consumption that I've seen yet.
  • I thought the oil was milky too, but it looked different than a head gasket leak. Turned out to be microscopic bubbles. Probably an air pocket from sitting then got churned up.
  • Compression is 150-155 rear, 160-165 front, dead cold.
  • No signs of coolant in the oil when I drained a bit.

What am I missing? Maybe just the carbs again? I just clean them a few days ago.

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post #2 of 13 (permalink) Old 02-21-2017, 09:17 PM
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the igniter should be the same for all years.maybe it sparks but not hot enough?the air bubbles in the oil is common on these bikes. mine has done it and I remember a whole thread dedicated to it

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post #3 of 13 (permalink) Old 02-21-2017, 09:27 PM
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https://www.vn750.com/forum/11-vn750-...ge=3&_k=8jd4fb air entrapment

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post #4 of 13 (permalink) Old 02-21-2017, 11:40 PM
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I would tinker with carb , and make sure to pace back and forth a lot around the bike smoking lots of cigarettes. For some reason it helps.
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post #5 of 13 (permalink) Old 02-28-2017, 04:41 PM Thread Starter
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I don't smoke, but I did plenty of swearing, knuckle scraping, and there's a scrapper car sitting out here I kicked a few times. Turns out the things that seemed like a head gasket were coincidences on an old bike. Greasy stuff in the coolant flushed out and didn't come back. The oil did look like bubbles but I was panicking, and it settled out fine. Coolant is still full after a proper burping.

Did the carbs 3 times, plus pulling the jet chamber covers while in the bike to check again (yes, it is possible). Acid washed and phosphate treated the tank. New fuel hoses and inline filters.

It's still doing the same thing, but I figured out a new trick for troubleshooting CV carbs. If I let in extra air, it's no different. If I pull the right (rear) coasting enricher cover ("air cut valve") and block the passages, it goes rich like it should and picks up the 2nd cylinder (mostly). I don't think weak spark would react that well to richer mixture, so it's either not getting fuel or it has an intake leak. And I've sprayed carb cleaner all over it with no noticeable effect. Pilot screw is several turns way the f*** out and it started hitting occasionally.

I swear these carbs are clean and the float is working though. I even shot carb cleaner from the pilot jets out through the pilot fueling holes, so the passages must be clear. When I had the jet covers off, I replaced the pilot jet with a different one. Both are clean, both had the same resistance to blowing through them. No change.

Is there anything I could be missing? I haven't felt well or slept well for a while for several reasons, and I'm about to dump this thing in a river. I really need to get it sold before the spring rush and tax refund season are over.
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Last edited by Hexadecimus; 02-28-2017 at 04:45 PM.
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post #6 of 13 (permalink) Old 02-28-2017, 04:58 PM
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don't dump it in the river yet.try switching gas lines.is one side partially plugged and it's not getting enough fuel?oh,and my niece survived her Facebook encounter.lol

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post #7 of 13 (permalink) Old 02-28-2017, 06:11 PM Thread Starter
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Lol, good to hear, Doc. Petcock seems to flow pretty freely. It shouldn't use much of anything at idle, and the fuel looked okay through the clear tubing. It also pulls hard above 3000 and it kicks in at idle if I use the coasting enricher, so I'm thinking it's not a supply issue but internal to the carbs. I'll check that anyway though.

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post #8 of 13 (permalink) Old 02-28-2017, 06:21 PM
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can't remember,haven't been inside a pvk in a while,do these carbs have an accelerator pump?

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lowered with progessive 412 10" shocks
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sportster seat

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post #9 of 13 (permalink) Old 02-28-2017, 07:49 PM
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spark plugs wires arcing on the engine? I found this on one of my bikes when I was f'in with in the dark
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post #10 of 13 (permalink) Old 02-28-2017, 08:45 PM
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Quote:
Originally Posted by jgs000 View Post
spark plugs wires arcing on the engine? I found this on one of my bikes when I was f'in with in the dark
my 79 goldwing did that

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lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
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