rpm's stay up

[8post96]

Hello, Im new here and just purchased a 1999 valkarie interstate w/22000 miles. I changed the fluids ,plugs and new front tire. My question is when Im riding and shift anywhere 3000-3500 as I pull the clutch in the engine rpm's stay up and dont drop. I have made sure the throttle rolls back. Is this normal? Any ideas? thanks 8post.

[flash2002]

Hi, make sure your choke is all the way off. It could be stuck in the open position.

[Beardo]

Vacuum line leak?

[Gryphon Rider]

Not normal.

[Pete]

Vacuum line leak?

+1 on the vacuum leak.

[Hook#3287]

Welcome to the site.  You might want to post your location, someone helpful might be close to you.

Sounds like a vacuum leak.

Has your Valk been desmogged?  If not, it's something you might want to consider.

A stuck choke could give that problem but I feel she would run a little rough also.  Also, stuck chokes are not really a common issue.

You can check the choke mechanism visually by looking above the chrome bar on the carb bank and moving the lever, you should see the cable moving the choke bar, on both sides, #20 on this page.

http://www.partzilla.com/parts/search/Honda/Motorcycle/1999/GL1500CF+A/CARBURETOR+ASSY./parts.html

Easier to do if you remove the chrome bar, then you can see where the lever hooks to each carb.

As stated, I believe your issue is vacuum.  All those 17 year old hoses are past their prime 

[gordonv]

I recall a higher than normal idle, using carb cleaner to even it out. Could this be the same thing? With only 22K miles, I would add a few tanks with good carb cleaner in it anyways.

1/2 can of Berryman B12 to a tank of gas. Drive normal. Since this is more of a cleaning than a treatment for a rough running engine. Otherwise 1/2 can to 1/2 tank, low RPM in high gear.

[..]

I recall a higher than normal ideal, using carb cleaner to even it out. Could this bee the same thing? With only 22K miles, I would add a few tanks with good carb cleaner in it anyways.

1/2 can of Berryman B12 to a tank of gas. Drive normal. Since this is more of a cleaning than a treatment for a rough running engine. Otherwise 1/2 can to 1/2 tank, low RPM in high gear.

Why low RPM in high gear?

[Harryc]

@Hook#3287 gave me some homework over the winter for the exact same problem. . I am 3/4 of the way through a Shiny Desmog kit install and complete carb rebuild. As soon as my slow jets arrive I'll button her back up. So far I found (3) partially clogged slow jets.

[Hooter]

Don't know if it sat for any period of time? With that many miles would say probably not on the road much. There is a possibility that there is a bad spot in the throttle cable? I'd start simple and lube the cables from the housing to the carbs. Then see if it still has the same problem. Also and first, check your intake clamps and make sure they are all good and snug.

Might drain the carbs. Fresh gas and a half can of Sea Foam. Ride all speeds and RPMs. After all this if no results, then move in deeper.

[BonS]

I had that problem with another CV carb bike recently. It was old gas products that had gelled up on the vacuum slide pistons. Due to the resistance the slides were slow to open so the engine went lean on acceleration and would hang at high rpm while the slides tried to lower. I sprayed them down with a solvent and wiped the carburetor walls where the slide slides and problem was solved.

[Steve K (IA)]

Hello, Im new here and just purchased a 1999 valkarie interstate w/22000 miles. I changed the fluids ,plugs and new front tire. My question is when Im riding and shift anywhere 3000-3500 as I pull the clutch in the engine rpm's stay up and dont drop. I have made sure the throttle rolls back. Is this normal? Any ideas? thanks 8post.

Vacuum leak.
Same thing happened to me.  In my case it was the diaphragm in the petcock.

[gordonv]

I recall a higher than normal idle, using carb cleaner to even it out. Could this be the same thing? With only 22K miles, I would add a few tanks with good carb cleaner in it anyways.

1/2 can of Berryman B12 to a tank of gas. Drive normal. Since this is more of a cleaning than a treatment for a rough running engine. Otherwise 1/2 can to 1/2 tank, low RPM in high gear.

Why low RPM in high gear?

Your condition, drive normal with the cleaner.

Most rough running engines seem to have a gummed up carb, which also are usually the slow jets. By keeping it in a low rpm, those plugged jets should be used, and this will keep the fuel working in that section of the carb.

This is an easy try, and easy to do. With only 22K on the bike, it's hasn't been ridden too much. Just a suggestion. This might clean a little more in the carbs too, wont hurt, and whats more fun, ridding the bike, or working on it?

But as others have suggested, vacuum and air leak, most likely the best choice.

[..]

I recall a higher than normal ideal, using carb cleaner to even it out. Could this bee the same thing? With only 22K miles, I would add a few tanks with good carb cleaner in it anyways.

1/2 can of Berryman B12 to a tank of gas. Drive normal. Since this is more of a cleaning than a treatment for a rough running engine. Otherwise 1/2 can to 1/2 tank, low RPM in high gear.

Why low RPM in high gear?

Your condition, drive normal with the cleaner.

Most rough running engines seem to have a gummed up carb, which also are usually the slow jets. By keeping it in a low rpm, those plugged jets should be used, and this will keep the fuel working in that section of the carb.

This is an easy try, and easy to do. With only 22K on the bike, it's hasn't been ridden too much. Just a suggestion. This might clean a little more in the carbs too, wont hurt, and whats more fun, ridding the bike, or working on it?

But as others have suggested, vacuum and air leak, most likely the best choice.