throttle/idle issues!

Alright. My step dad and I finally got my bike running, BUT we have a huge problem.

When I start up the bike, it revs all the way up to 8000 RPMS and stays. It will go down if we push the cable down but other than that it won't go down.

I don't have the money to fix the carbs and I'm praying that we are missing something real simple here. Anyone have idea that they can throw out to me so we can fix it up thursday?

 

First, what kind of bike do you have? Second is the choke on or off? When you start it are you giving it gas? Are you sure the throttle isn't sticking open? The choke could be sticking open.

Valve clearances have you checked them?

Sounds from what you are saying the throttle is sticking. or the butterflies on the carbs are sticking open, but we don't know really cuz we don't know what cable you are refering to....

 

Turn the idle adjustment screw down? That can also be a vac leak or a sync issue.
What did you do to "get it running"?
If you look through the forum, there are tons of threads about "easy fixes".
It's a 30 year old bike, you've gotta go through it from top to bottom.

 

Sorry. I've got a 81 XJ650 Maxim.

When I start it, I just press the start button and it starts up and then automatically shoots to 8/9000 RPMS without touching the throttle. The choke is fine but I was wondering about the idle adjustment.

Are the 3 screw in between the carbs the idle adjustment? How would I go about adjusting them so they all are the same?

 

Check your throttle cable first, it sounds like it is binding up and keeping the carbs open. With the engine off roll the throttle and let go, you should hear the carbs "klink" shut.

 

The throttle clicks shut but I'm having problems with the idle. Why does it shoot up to 8/9000 RPMs when I first start it?

 

In order to rev that high, ... the Throttles have to be open.

Something is keeping the Throttles Open ... and ... the possibility that you Diaphragm Pistons are not closing after a long sit cannot be overlooked.

The BEST advice for you and your dad is this:

1. Get a Factory Workshop Manual. You NEED one.
2. The Carbs need to be Cleaned because they sat way too long.
3. Post your location to see if there is anyone nearby you who can render you some assistance with the Carb Cleaning.

4. Get familiar with the processes called-for in the Scheduled Maintenance Section of the Workshop Manual.

5. This Forum has an enormous Talent Pool which provides assistance to people like you and your Dad.
Use your SIGNATURE and LOCATION Feature to let us know about you.

Location: Fill-in.

Signature:

<Year> -- <Model> -- <Total Miles> -- <Stock or Modified>

We'll do what we can.

 

Man oh man. These engines are incredibly complex, yet easy to work on. There is, however a lot that you need to attend to.

Valve clearances need to be checked.

The carbs WILL need to be serviced; how much it costs depends on what you find when you open them up. You will need to replace certain bits.

It sounds like you recently acquired this steed; you need to check really important things like the BRAKES before you even THINK about riding it.

This isn't a used car. You've got to attend to a lot of very important items if you want it to run and more importantly STOP. Forget about Thursday; you've still got quite a bit of work to do. Shortcuts won't work, unless you want to be at this forever. I'm not making stuff up, that's just how it is, honest. Sorry.

 

Everything is done on the bike cept for this problem that I'm having with the throttle. so i'm going to haev to find someone near me who can work on carbs for me.

 

The problem that you're having is related to the fact that your carbs need to be serviced.

They need to be torn down, cleaned, all "dead" rubber parts replaced, float levels set using fuel and then bench sync'ed.

Once back on the bike, you need to do a running vacuum sync. Until you DO all of these things, it's not going to run right.

And if the valve clearances aren't in spec you won't get it to sync.

You need to get and study a service manual, even if you think that you're going to find someone to do it for you.

 

I'm on ebay right now, trying to find one that I can buy. Just gotta save up so I can put it into a shop to get the carbs done.

 

You can get one from Chacal most likely. You can try, and it might not work because it sounds to me like the throttle cable and or carbs are sticking is adjust the idle with the idle adjustment screw it is behind the carb rack in the middle of the carbs.... Getting to it is tough if you have big hands the time I did it I burned my hand a little...

 

If you are going to have the Carbs Cleaned for you; don't have a SHOP do it.
They charge by hour.
You'll run-up a great expense just having the Tech get the Carbs off the Bike and on the Bench.

Remove the Carbs from the Bike and find a reputable place that Cleans and Restores Carbs.
Round-trip shipping will be less than the Labor having a shop remove and replace them.

 

You could check with hogfiddles. I know he has some 650's that he is parting out. he might have a set you could use.

Here is his post
http://xjbikes.com/Forums/viewtopic/t=33487.html

Also,
There was a member on here that did carb rebuilding if you sent him the carbs. You would still have to get the running sync, and color tune done.
At leaset the rebuild/bench sync would be done correctly.

Ghost