Question about 2000 Honda Valkyrie Interstate

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Valkyrie has a pop in the exhaust at idle..on #1

2000 valkyrie has a pop in the exhaust at idle..on #1 cylinder...carbs were cleaned but still doing it. If you put the choke on, runs highway speeds it seems okay but not sure..dirty jet? Has 30k on it..thanks.

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Well i would start buy checking for vacumm leak at carbs and at exhaust system can do this to most check all rubber seal for cracks and things like that hope this helps

Posted on Feb 08, 2010


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Just a hunch. Clearly there is a fuel issue on one of the cylinders. Although you cleaned the carb, please confirm that the intake valve is clean and/or reed valves are working properly. It is possible that the 2nd cylinder is only firing occasionally even at the higher RPM but it's less noticeable because of the engine's inertia at that speed makes it "seem" to be running smoother. The clue lies in the fact that the engine runs smoothly at idle when the choke is applied and starts to miss when choke is open ... this is indicative of fuel starvation. And yes, on a 2 cycle, a lack of fuel means a lack of lubrication.

Out of curiosity, take both spark plugs out and crank the engine. Do this outside away from an open flame. Compare the amount of misted fuel that comes out of each cylinder head with the choke closed and then again with the choke open. If it isn't even then the cylinder that is blowing less fuel is being starved. This should identify the problem cylinder and help to narrow down the elements left to troubleshoot and replace/repair/clean. Good luck and hope this helps

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Sounds to me, if there is nothing mechanically wrong with the carbs (carbon build up, broken choke spring), that they need to be synchronized. You'll need a vaccuum gauge and some aquarium tubing and a lot of patience. I'd check the spark plug condition to verify what cylinder it is. If it is indeed cylinder 3 (factory set carb), it will be either choke spring is broken or jets are clogged up with bad gas or dirt. For instructions on synchronizing carbs go here:
I've been there, done that.

Oct 18, 2012 | 1998 Honda F6 C Valkyrie

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I have a Briggs & Stratton 2 cylinder motor Model # 42A707-125201. Runs fine at high speed with the choke off, but it will not idle smoothly unless the choke is partially on (about 2/3). I rebuilt...

The fact the choke must be 2/3 applied to obtain a smooth idle indicates not enough fuel is being supplied by the carb at idle speed. Applying the choke richens the air/fuel ratio.

I suggest you revisit the carb idle air/fuel jets, air passages and any adjustments as well as checking for intake air leaks.

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2003 Honda F6 C Valkyrie will not run without choke on

Hi, Anonymous and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
You guys with Valkyries need some help
Honda Valkyrie choke on YouTube
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Jan 09, 2012 | 2003 Honda F6 C Valkyrie

1 Answer

My 2003 Honda Valkrie starts with the choke but won't stay running wiyhout it.

That is a sure sign that the carbs need cleaning. The low speed idle jets are plugged up and the choke cuts back the air and allows more fuel in the mix. There are 6 carbs on the Valkyrie so have someone who knows what they are doing clean and sync them.

Jul 09, 2011 | 2003 Honda F6 C Valkyrie

1 Answer


hi had a similar problem with 1 of these i think you will find it is carbs, bit of a tough job to do but not impossible if you are mechanicaly minded, i would however say to save confusion, do 1 carb at a time completely finish and put together each carb before you do the next 1, tip, i found the floats were sticking and required removal for valve cleaning, just work on the cylinders that arnt working leaving the others alone.

Dec 08, 2010 | 2000 Honda Valkyrie Interstate

1 Answer

Starts and idles will not run above idle unless choked. Have cleaned carb multiple times new fuel filter new air cleaner and cleaned exhaust screen new plug. Maybe a collapsing fuel line?

Have you tried adjusting the carb? There should be two screws on the carb (hi & Low) turn the hi screw completely until it stops and then start the unit. Let it warm up and then begin to back the screw out until it starts to run smoothly but strong. Once you have it running then put it in full run position (choke) and you should be good.
Good luck!

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Idles fast exhaust gets red nhot

better ajust choke or turn down idle screw before u burn engine-must have air passin by cylinders--may also be an internal problem with carbs like dirt etc-buy a manual for troubleshootin

Sep 17, 2009 | Yamaha Alba Motorcycles

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I have a 1999 honda valkyrie interstate. it is idling and throttling rough. with the choke engaged at startup it will only idle at about 1100 rpm. when i throttle up it it just doesnt feel like it should....

I would change the plugs and the air filter. Also I would put a full can of Techron or Seafoam in the gas tank and ride it to see if it clears up. If these bikes sit very long the slow jets in the carbs can partially or fully clog resulting in rough running. If the bike sits for long periods over 2 months I would also use a fuel stabilizer such as Seafoam or Stabil. Make sure when adding a fuel stabilizer that the bike runs long enough to get the additive in the carbs.

Sep 06, 2009 | 1999 Honda F6 C Valkyrie

2 Answers

Honda Valkyrie Interstate 1999: 25000 miles Cobra 6x6 exhaust: Bike runs rough when idling, missfires & looses power after extended idling (in slow traffic). It's ok on open road. Carbs were cleaned...

I just went through this over the last 2 months with my 97' Standard. I tore down the carbs, cleaned, replaced all O-rings, Vac tubes and rejetted with new Factory Pro jets. Did not solve the problem. I finally determined it was the gas. I must have gotten a bad tank of the stuff. As soon as I swithed over to a name brand, Cheveron, Texaco, Exxon, etc. the problem was solved. Give that a shot before you start tearing things apart like I did.

Aug 28, 2009 | 2000 Honda Valkyrie Interstate

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