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Carbs and Fuel System
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post #1 of 16 (permalink) Old 02-15-2007, 09:25 PM Thread Starter
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Something Wrong

When bike,'86 is idling,front cylinder feels warm,while rear cylinder feels cold. When I take off,bike lacks power until I rev it up and around 5k,it kicks in and starts working great. I will change plugs saturday.I was thinking about spraying gumout through rear carb to see if maybe something is blocking jet.I already have seafoam in tank.Battery is probably weak.I will charge saturday also.Air filters are clean,Hose cut off at 45degree angle,still in need of carb sync.Tried homemade manometer,but rear cylinder tried to suck in the fluid from manometer. Any advise?????
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post #2 of 16 (permalink) Old 02-15-2007, 09:33 PM
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If the rear carb tried sucking in the fluid there was alot of vacume or almost none on the other one.
That is a good one. Maby a jet pluged.
Will the rear fire with the choke on?
Have you checked Spark?

Chad Falstad "Hawk"
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post #3 of 16 (permalink) Old 02-15-2007, 09:41 PM Thread Starter
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Yes, I checked spark and it seems ok.Also, when choking,seems everything is fine.Maybe something clogging carb.I rebuilt carbs,but maybe something got in there.
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post #4 of 16 (permalink) Old 02-15-2007, 09:43 PM
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The choke will richen the mix and keep it running if the pilot jet is cloged.
That might be your problem.

Chad Falstad "Hawk"
Vroc #17649
2011 HD Ultra Classic "angel"
2001 Nomad 1500 Sold March 2012
2001 VN 750 "Sold June with 2008 with 21,000""Serinity"
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post #5 of 16 (permalink) Old 02-15-2007, 09:49 PM Thread Starter
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One time, I put gumout in carb through drain hole.The bike ran like it was brand new.I just dont want to damage any rubber.When I did carb pull, I had to replace rear carb vaccume diaphram.It had a tear in it.Gumout is great,but it must not sit for too long.Maybe 5 minutes.I once read no more than 20 minutes. Just please,dont make me pull the carbs again.It was awefull.Not really,just different.I havent given the seafoam time to work yet,as it has been -15 degree's here. Question, isnt the pilot jet for idling only?

Last edited by ssmendez; 02-15-2007 at 09:54 PM. Reason: more info
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post #6 of 16 (permalink) Old 02-15-2007, 10:16 PM
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Idiling and low rpm, I believe.
Over 5k runs fine though. That's interesting.
Vacume is still running through my mind after you said with the manometer.
The right carb runs the rear and was trying to suck up the fluid.

Chad Falstad "Hawk"
Vroc #17649
2011 HD Ultra Classic "angel"
2001 Nomad 1500 Sold March 2012
2001 VN 750 "Sold June with 2008 with 21,000""Serinity"
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post #7 of 16 (permalink) Old 02-15-2007, 10:40 PM Thread Starter
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It could be as simple as a spark plug. Sometimes, a cylinder wont work,but when you rev it up, something kicks in,and it works.When I am going about
40mph,I hit the throttle lever a few times and all of a sudden,she lunge's forward,ready to go and does fine.Also,my carbs may be so out of sync,there,the problem might be.
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post #8 of 16 (permalink) Old 02-16-2007, 07:09 AM
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If your rear carb was sucking all the fluid out of your manometer then your carbs are definitely out of sync. The carb sync screw adjusts the vacuum in the rear carb only - that is, you're adjusting the vacuum to match the vacuum of the front carb. Because you have so much pull in the rear, turn the sync screw to the LEFT - theoretically that will reduce the vacuum, and bring it more into line with your front carb. I'd suggest trying that first (since that's clearly an issue), and at least eliminate that as the source of the troubles.

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post #9 of 16 (permalink) Old 02-16-2007, 06:32 PM
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Bike woes....

I won't discount the stuff about the carbs out of sync and jets being clogged as I don't have a clue about any of that stuff. But, I do know a weak battery in our bikes will make it do funny things running. First off, if you don't have a gel or MF battery- get one. That maks huge differences in the bike's runnability. Plugs are also a good idea. Would be best to put both in at the same time because a weak spark or miss caused by a problematic battery will foul new plugs just the same as the ones that came out of it.

My $0.02.

Ben-
SW Ohio

'02 VN750
Pipes drilled
Spline lubed
R/R relocated
AGM batteried
Iridium equipped
LED tail lighted
8000-ish miled
Soon to be MCCTed

Lovin Life.
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post #10 of 16 (permalink) Old 02-16-2007, 10:30 PM Thread Starter
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so your saying,If my battery is low on charge,It might ruin the sparkplug?
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