bike idles but dosent rev up

[123red82]

hey i am new to motorcycles i have an 83 vision that i just bought it has been sitting a while, the carbs were cleaned a year ago but never driven since from what i am told i cleaned out the tank put a new fuel line on with a filter cranked it over till it fired it starts fine and even idles on its own for around 5 minutes but dies eventualy when you open the throttle it sometimes revs up but only to a certian point and bogs down and other times it just dies any help would be greatly appreciated thanks

[Rick G]

If the carbs had gas in them , more than likely  they will need to be dipped. If you need tutoring in this procedure, contact Lucky , on this forum and get one of his Cd's. between that and  our help , you will get through it!

[Lucky]

it sounds like eiter a crb cleaning or fuel starvation (blockage or synq adjustment is way off)
--Lucky

[Tiger]

 :) Hello and welcome to the ROV, the only place a Vision should bring its new keeper!!!

I had exactly the same problem with "The Mistress" when I first got her...The carb's may still need cleaning, however, it may well work using a can of Berrymans carb cleaner, added into the gas tank, from your friendly Walmart for about $3.00 'ish...Worth a try ;)

or/and...it could be the carb's need sync'd.

              8).......TIGER....... 8)

[YellowJacket!]

Make sure the fuel line is not kinked and the vacuum line is connected to the petcock correctly.

Oh, btw, welcome to ROV!

YellowJacket!
aka David

[123red82]

thanks for the help i think i will pull the carbs apart this weekend also the yics is leaking so i will also fix that and hope fully be able to get it running

[inanecathode]

Before we go diving headlong into carb dip, hows your spark plugs/wires? I know these are vision carbs, but they were cleaned already, that counts for something...

[123red82]

ok i cleaned the carbs all jets out striped right down dipped and back together started up idles nice as soon as you touch the throttle it dies played with the sync a little and can get it to rev a bit better but then it wont idle. there are two brass screws at the bottom of the carb on the petcock side what do those need to be set at and is there any other set screws i should check i also did the yics fix and it is air tight thanks for all your help

[Rick G]

When the bike tries to die, pull the choke on . If it then will rev up , the carbs are still gummed up , if  not then the problem is elsewhere.  Let us know.

[inanecathode]

This reaaaaaally sounds like an ignition problem to me.

[Rick G]

With out experencing it in person, I'm going with the easy stuff first. It only takes afew seconds to  start it and pull on the choke . Finding  an electrical problem  will take longer.

[inanecathode]

Well yeh, it will, im just saying it sounds like ignition to me, could be fuel starvation too i suppose.

[dj]

If it starts and idles then the ignigtion sounds fine to me.  It seems to me that one (or both) part(s) of the carbs isn't spraying (not spraying enough) gas down the throats when the throttle is twisted.

The two screws that you are talking about (as long as they are on the left side of the bike by the drain hose for the carbs) is the drain screws.  They are loosened to drain the float bowls.  they can also be loosed to check and see if there is gas in each bowl (good trouble shooting technique).  Loosen one screw at a time and see if gas drips out the drain hose.  This will tell you if both bowls have gas in them.  If they both do then take the tank off and the air filter and look down the carb throats.  Give the throttle a twist and see if there is a good stream of gas coming out the bronze colored nozzle on both the front and back carb.  If not then that is your problem.  The carbs will need to be taken apart again and the bronze nozzles removed (there is a small ball and a small weight in the tube where it sits that need to come out as well.

Try that and let us know what happens.  Sounds to me like enough fuel is getting through the nozzles to idle, but not enough to keep the bike running on higher RPM's (fuel starvation).

[kwells]

sounds silly but jets can easily be mixed up

[Rick G]

NOT silly, at all , tha's why I use a jewelers loop, when working on carbs. Some jets look the same but are differant sizes.

[123red82]

ok carb cleaning round 2 i got on excelerator pump nossle working and the other dripping the diaphram is not looking that great little cracks, and the nozzle is plugged i had the nozzle off and ball and weight out and let it sit in carb cleaner now when i first take it out of the cleaner i can blow through the nozzle but after one blow the cloggs up again any ideas of getting the clog out and any one know the best place to get a diaphram? thanks

[Lucky]

the wire on a needle threader, you know the little thing you stick thru the eye of a needle to put the thread in? picture of a girl on the flat metal part? clip the wire off one end, it's stiff enought to scrape away all the crusty stuff inside the nozzle without changing the hole size.

--Lucky.

[Rick G]

I keep several sizes of multistrand electrical wire in my tool box , to clean out jets with. They don't last long but there disposable  and cheap.

[123red82]

how can you tell the differance between 82 and 83 carbs i was told the bike is an 82 and the motor is an 83 but i would like to double check before i buy parts thanks

[Brian Moffet]

The photo below is a set of 1983 carbs.  If you click on the URL, you can see more photos of the same set from different views.  (choose "previous", the photos are in reverse chronological order, sort of).

You can see two lines coming out the side of the carb, one is a return to the petcock (comes across the top in a T), and one is the inlet to the pump.  82 carbs don't have that.  I looked for a photo of 82 carbs, but I couldn't find one.

Brian