Question about Honda Valkyrie Interstate Motorcycles

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Honda Valkyrie Runs Rough

My 2000 Vakyrie will start normally and warm up and idle normally. After going down the road for about 5 miles at like 45mph it will start run rough. If I stop for a bit and keep it idling it clear up. Once I head down the road again for a mile or two it runs rough again.

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Carb needs ajust in the jet area--let a pro du this cause if u git it tu lean engine damage can happen--the mid to high speed jets shud be lookd at--also caarb may b dirty-take air cleaner off and spray some solvent in ther--stil mite need rebuildn

Posted on Feb 13, 2014


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Posted on Jan 02, 2017

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SOURCE: Honda Valkyrie Interstate 1999: 25000 miles Cobra

Stock size for the slow jet is 35. Some guys put in 38's to make them less prone to getting plugged. I would say that you still have gunk in the slow jets. Also turn the pilot screws out 2 1/4turns. If the exhaust pops and you have no exhaust or vacuum leaks turn the pilot screws in 1/4 turn at a time till it goes away.

Did you change the plugs and the air filter? How about checking and or replacing the vacuum lines?

You might try a full bottle of Techron fuel system cleaner in a tank of gas. It may clear the problem up.

I had to clean the jets on my 1999 I/S twice and it's not a fun job.

Hope this helps.


Posted on Oct 14, 2009

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SOURCE: Honda Valkyrie runs rough

Your carburetors have varnished fuel in them and need cleaning. You most likely have clogged slow and fast jets. The fouled plugs pretty much say it all with this regard.

Posted on Feb 23, 2013

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Hi, Anonymous and the usual suspects are:
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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

My 2000 ford explorer runs rough when started after sitting for a while but once i drive down the road for ten to fifteen minutes it runs better.

Have a mechanic check your idle bypass valve, since it may be bad
or need cleaning, also, have a tune-up done, if you haven't had one in
the past 30K miles. Good luck.

Mar 27, 2010 | 2000 Ford Explorer

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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

3 Answers

Honda Valkyrie runs rough

Your carburetors have varnished fuel in them and need cleaning. You most likely have clogged slow and fast jets. The fouled plugs pretty much say it all with this regard.

Mar 23, 2009 | 1997 Honda F6 C Valkyrie

1 Answer


Locate you computer (right front kick panel) and tap on it with a pen while the car idles... Also flex it back and forth with your hands to see if the car runs rough or quits... You may need a new one.

May 15, 2008 | 1988 Oldsmobile Delta 88

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