carbs

[art]

Has anybody ever had to replace the carb slides an vacumn rubber? I think part of my problem with poping may be related to them.They are expensive at $127 each

[Pete]

Remove them and check with a light, the rubber between you and the light, if there are no pin points of light thru the rubber they are probably ok. Check for wear and nicks or rough spots on the pistons and needles. Resurface, repair, replace as required. Typically the only thing that goes wrong is the holes or tear in the rubber. Or needle wear on high, high mileage engines. Be careful during reassembly that every thing is seated properly and clean, do not force anything. 

[art]

that sounds like a good idea.I will check them with a light an hopefully I will not see any holes.The slides look good.I have 100000 miles on a 02 an that is my only problem.thanks,Art

[Pete]

OBTW, holes in the rubber carb piston skirt, usually causes a hesitation, like a carb sync issue. Everyone I have replaced was due to a hole or crack in the rubber causing a fairly severe hesitation. The rubber does not fail very often. I am not very confident that, that is your problem. Is it popping in the intake or exhaust?

THanks Pete.

[art]

It'spoping on exhaust.I've done the desmog an replaced all the vac. lines an capped of the carbs,tightened the clamps between the carbs an intakes,replaced the intake "o" rings an still got poping from the rigth side.runs great above 2500 rpm,great power but pops on deceleration.the jets have been cleaned .Art

[Pete]

Sounds like something is letting to much gas thru on deceleration (rich condition) or air into the exhaust during deceleration or both. What happens if you hold the carbs open just a little during deceleration? If that changes the condition, you might want to check card sync. Thanks Pete.

[art]

The poping will go away if I hold it open on decel. I will readjust the pilots an sync.the carbs again.I've got to wait for good weather .It is raining an cold here in Or .the fall an winter sucks up here.We moved here from Az.four years ago an It is beautiful in spring an summer.Thanks again .Art

[Farther]

How about re-torque the exhaust header bolts?

[Cruzen]

Sounds like something is letting to much gas thru on deceleration (rich condition) or air into the exhaust during deceleration or both. What happens if you hold the carbs open just a little during deceleration? If that changes the condition, you might want to check card sync. Thanks Pete.

Ah, I thought the popping was caused by a LEAN condition.  I experience this problem on my Magna when I have to lean it out to go through emissions.  When I fatten it up the popping stops but then the gas mileagse does go down a bit.  My Valk makes it through the emission check so I don't mess with it.

[art]

my exhaust header gaskets have been replaced with no change. the problem is in the carberation

[fstsix]

How many turns are your Pilots set? (Is your exhaust stock any mods?) Trigger Wheel?

[art]

4% trigger wheel an piggies cut .I've had this mod. for 5 years but only had the poping for about 1 year

[fstsix]

Try setting your pilots @ 2-1/2 if that doesn't work you may need to check your slow jets again they are small they can clog easy.These bikes are set up lean from the factory to pass EPA in the states.

[Pete]

Generally speaking popping (backfire) occurring in the exhaust tract is extra gas igniting in the exhaust. Popping (backfire) in the intake is generally caused by a lean condition.  On some Goldwings (carbed) Honda introduced a circuit on deceleration to prevent an ultra lean condition that caused a backfire situation. To my knowledge this circuit was never used on a Valkyrie.  So yes an ULTRA lean condition can also cause popping. To test for that, backout the pilot mixture screws. If you have already back then out before the condition started then screw them in and test it. It may take a fairly large adjustment to affect a change. Try it in increments. Had the bike set inactive for a time, before the start of the problem? If so slow jets could be dirty. Thanks Pete.

[art]

My valk never sits inactive.I have adjusted teh pilots today from 1 1/2 out to 2 1/4turnsan synced the carbs an it runs lousey up to 2500 rpm then it runs good.lots of poping on decleration an when I crack the trottle while idling.I am going to pull the carbs soon an check the jets an look for any bad "o" rings an anything else that could be wrong.I changed the plug wires an it seamed to get worse at the time.I went with automotive excel wires.Other valk riders have used them with no problems.I may have to go back to stock wires.Art

[Pete]

OK, based upon the it got worse when going from 1.5 to 2.25 turns! Slow jets probably not clogged, mixture may be to rich? Might want to try 1.00 or 1.25 turns on the pilot jets.
 
As for changing the wires making it worse, you could have introduce a bad wire or bad connection. May be time to return to the original setup until you are convinced it is or is not the carbs.

Thanks Pete.

[art]

thanks Pete I'm going to do both.First I'll chang the pilots an some time this winter I'll change the wires.I'll heve to order new ones an they are pricey,About $26 each wire.I'm in no rush.Art

[art]

does anybody know the diameter of the holes in the 35 an 100 jets?

[BlueValk]

I believe that they are .35mm (.01378") & 1mm (.03937").  I bought a very fine drill bit to clean out some old pilot jets. 80 was the number for it.  Seems to have worked fine.  I used oil on the bit and the jet, and of course just did it by hand with some masking tape wrapped around the drill bit.
BlueValk