Dying when throttle is twisted?! Help!

[rharding91]

I own a 2007 GS500F that I bought last year around August. I've never had a problem out of it. Around a week ago I was driving it home from my boyfriends house & I noticed it bogging a little bit. Not much, but just enough for me to notice something wasn't right. I figured it was due for a tune up. I got a new air filter, spark plugs, oil filter, changed the oil and cleaned out my carburetor. I didn't do a deep cleaning, just took the bowls off and cleaned the jets. I didn't mess with the floats. My fuel filter is still good. It idles at about 1,000. Maybe a little over. It isn't idling very smoothly, either. When I twist the throttle it cuts off immediately. When I turn the choke up the RPM's go to about 4,500 - 5,000, but it sounds awful. When I twist the throttle the RPM's drop and when I let it go, they shoot back up to where they were.  any ideas what it could be??

Btw, that's the first time I've ever cleaned a carburetor.. lol

Also, it runs rich, because the spark plugs I pulled out of it were black. I just ordered a stock exhaust. The guy that owned it before me, I'm assuming, didn't rejet properly or at all even. I guess I'll know when my new exhaust gets here.

My bike did the same thing as your talking about when I cleaned the carbs. My first time doing it also, come to realize after doing all this other shaZam! these people mentioned I had put the carb jets back in opposite on one side. So when I would give gas it would give too little gas and during idle get too much. Seriously my symptoms were the exact same as yours after I cleaned the carbs. Took them off again and looked a little more closely at them and each jet has a number and followed the wiki for which one goes in which spot, and boom. Put it all together and ran perfectly.

You should try this before anything else.

[billieray127]

I'm sure. My buddy has a blazer that he cut the muffler off of and it's just about as loud as my bike was. But out where I live they don't care. Just about every truck out here is straight piped.  I got my new exhaust on! I didn't get to do any work on the bike, but I had enough time to put that on. It's freakishly quiet... I don't like it. :- but it's for the better. Lol


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[billieray127]

Thanks, rharding91. Knowing me that's probably what I did. Haha do you have a link for the wiki page??

[rharding91]

2004 - 2007: Pilot 17.5, Mid Main 60, Main 130

http://wiki.gstwins.com/index.php?n=Upgrades.Rejetting

[joshr08]

did you pull the slides when you cleaned the carbs?  Did you make sure the slide diapham was seated properly along with the slide facing the correct way?

[billieray127]

What are the slides?

[joshr08]

there's a plastic cap on top of the carb with 2 screws the slide is what moves up and down with the throttle lifting the main jet needle to allow more fuel to flow with more air. 

[oldmech]

#5 in this diagram i believe.
is your fuel tank vent clogged?

http://wiki.gstwins.com/index.php?n=Main.2003-current

[billieray127]

Yeah, I'm pretty sure I put everything all back together properly. I'm gonna go through all my hoses and make sure I put them all in the right places. I don't think any of them are clogged. I'll check that too.

[oldmech]

sorry my bad, i meant the vent in your fuel cap. if it runs ok with the cap open. there is your answer.

check out this thread.

http://gstwins.com/gsboard/index.php?topic=41061.0

[billieray127]

Anyone know where this hose goes? It's a T. The other side of it hooks to about 500 more T's. xD
I tucked it up under some other hoses, so you could see which one I was talking about. Guess that didn't work as well as I planned.

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[joshr08]

looks like the vac line that runs the vac to your carb slides and to the petcock.

[billieray127]

I thought that was a vent and the hose that hooks to it hooked to nothing? Atleast that's what I read.

[billieray127]

Wait were you talkin about the tank petcock or the one beside the seat? lol

[billieray127]

Okay, yeah, that hose goes to my petcock. I've got it all put back together now and it's idling wonderfully. but.... It makes a little clacky noise and the rpms drop a little bit, almost dies, then rises back to where they're supposed to be. When I rev it it takes the rpm's a whole second to drop back down. Kinda laggy. What now? This whole not riding thing is driving me insane. :- and all this work is making me think twice about going to MMI.


Definitely just kidding. I love getting to know my bike better.

[jestercinti]

Most likely a misfire.  Mine does that too.  Is it the left-hand side?  How's your battery?  I had that happen and it was a weak battery causing weak power to the LH coil.  Common problem since the LH coil power wire travels through a lot of wires to get there.

This is all assuming your plugs are good and carbs are squeaky clean.

Go on a long ride (but don't stray too far from home in case something happens).  That will charge your battery.

[billieray127]

If you're standing behind the bike it sounded like the right side. I'll take it for a ride tomorrow.. Maybe. It's snowing. Tennessee doesn't know what's going on when it comes to how the weather is supposed to be. Lol but it probably won't stop me. Unless the roads are bad.

[rharding91]

If you're standing behind the bike it sounded like the right side. I'll take it for a ride tomorrow.. Maybe. It's snowing. Tennessee doesn't know what's going on when it comes to how the weather is supposed to be. Lol but it probably won't stop me. Unless the roads are bad.

What was wrong with it originally to cause the throttle problem?

[billieray127]

I hooked up some of the hoses wrong.