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General Category => Yamaha FJ1100 / FJ1200 Running Problems => Topic started by: ELIMINATOR on September 21, 2013, 12:46:26 PM

Title: 12003cv idle is no longer smooth
Post by: ELIMINATOR on September 21, 2013, 12:46:26 PM
My bike seems to be not running smoothly on the idle, and up to about 2,000rpm on low throttle. Open it up and it's as smooth as ever.

I've looked at various threads, and I'm praying I don't need to remove the carbs, that just frightens me.

A while back I fitted new silencers, although I don't think :rofl2: the problem is connected.

My fuel consumption seems to have got worse, although, I can't say if I'm riding it the same way.

I also noticed that occasionally the rev. counter doesn't move from start up for about a second or two, I know??? I assume that the rev. counter works via one of the coils, could this be related. Although the bike still seems to be not running correctly even when the rev. counter is working properly.

One other thing, when I turned the engine off the other day, when the sun was low. I noticed that a heat shimmer could be seen dropping out of a breather pipe, this is not one of the carb, overflow pipes. it's on the L/H side of the bike ( although at the bikes age, who knows if anything is routed correctly.) I put my finger on the end and sniffed to see if it was petrol, it wasn't.

Bike now shoved to the back of the garage.
Title: Re: 12003cv idle is no longer smooth
Post by: FJ111200 on September 21, 2013, 01:12:18 PM
What'sthe air filter like?   Blocked?  Holed?

Don't be frightened of taking the carbs off if need be.    Everything is part of the learning process, and a shed load cheaper than going to a bike shop.
Title: Re: 12003cv idle is no longer smooth
Post by: ELIMINATOR on September 21, 2013, 02:15:05 PM
Air filter is less than 4,000 miles old.
Title: Re: 12003cv idle is no longer smooth
Post by: ELIMINATOR on September 22, 2013, 03:36:19 AM
Needle seat O rings seem the likely culprit to me, see here.

http://www.fjowners.com/index.php?topic=46.0 (http://www.fjowners.com/index.php?topic=46.0)

Ah, I forgot to say, the bike pops and bangs on the overrun when rolling off the throttle.
Title: Re: 12003cv idle is no longer smooth
Post by: ELIMINATOR on September 22, 2013, 04:58:02 AM
I'm sure it never used to, that would hint at too much fuel on idle?
Title: Re: 12003cv idle is no longer smooth
Post by: Pat Conlon on September 22, 2013, 03:35:15 PM
When was the last time you sync'ed the carbs?
Title: Re: 12003cv idle is no longer smooth
Post by: ELIMINATOR on September 23, 2013, 06:57:49 AM
About 4,000 miles ago. It is just the idle and up to about 2,000 rpm.

The popping and banging on the over run would probably remove the possibility of the carbs being out of balance?
Title: Re: 12003cv idle is no longer smooth
Post by: Bminder on September 23, 2013, 03:22:53 PM
If it were my bike I would first guess would be that one or more of the idle jets (also called pilot jets) were plugged.
It's not that tough of a job to pull the carbs and clean those jets. I've done it so many times this summer I could probably do it blindfolded like a soldier has to clean his rifle. My bike sat for 3 plus years and was gunked up bad.
You can do it.
Title: Re: 12003cv idle is no longer smooth
Post by: ELIMINATOR on September 23, 2013, 03:55:00 PM
Mate owns abike shop, so Ican use his sonic cleaning tank. Just a question of getting a round to it then.
Title: Re: 12003cv idle is no longer smooth
Post by: Bminder on September 23, 2013, 08:40:43 PM
Once you get the tank to him, pull the carbs and clean the idle jets.
Title: Re: 12003cv idle is no longer smooth
Post by: Bminder on September 23, 2013, 09:44:34 PM
If the idle jets are plugged, they wont' unplug themselves with a clean tank and carb cleaner in the gas. The holes in them are too small, you have to you take them out and clean them... ask me how I know  :wacko3:
Title: Re: 12003cv idle is no longer smooth
Post by: ELIMINATOR on September 24, 2013, 12:33:39 PM
Just ordered four carb. gaskets and FJ11-12/XJ12/XJR13 S/S Screw & O-Ring Carburetor Kit    
FJ11-12/XJ12/XJR13 S/S Screw & O-Ring Carburetor Kit from Randy, well, I have to start somewhere :good2:
   

Title: Re: 12003cv idle is no longer smooth
Post by: RichBaker on September 24, 2013, 07:37:05 PM
Onbce you get them apart, you'll be kicking yourself for waiting so long to do it.... These are MUCH simpler than the old Q-jets and such. No check balls or other little parts/pieces to go missing on ya....    :dash1:
Title: Re: 12003cv idle is no longer smooth
Post by: ELIMINATOR on October 05, 2013, 01:27:55 AM
Interesting...................... Parts arrived, I put them in the garage after showing them to the bike. As the tank is full, I used it to commute to work. Bike running normally, obviously the threat of me removing the carbs knocked some sense into it. :good2:
Title: Re: 12003cv idle is no longer smooth
Post by: Bones on October 05, 2013, 03:15:24 AM
Yeah, even though these things are machines, I'm sure they've got a bit of human DNA in there somewhere. As soon as you say how good it's running to someone, it'll play up something shocking, :ireful: and in your case with it running rough threaten to pull it's heart out and operate... it runs properly. :good: It's happened to me several times and I'll just look at it and go" You Bastard"

         
Title: Re: 12003cv idle is no longer smooth
Post by: markmartin on October 05, 2013, 06:42:57 AM
Quote from: Bones on October 05, 2013, 03:15:24 AM
It's happened to me several times and I'll just look at it and go" You Bastard"        

You could try this:)  Wynn's 'Start You Bastard' Engine Additive Advert (http://www.youtube.com/watch?v=cY1YndLmbXQ#)
Title: Re: 12003cv idle is no longer smooth
Post by: ELIMINATOR on October 06, 2013, 03:29:54 AM
 :good2: :good2: :good2: :good2: :lol: :lol: :lol: :lol: :lol:
Title: Re: 12003cv idle is no longer smooth
Post by: ribbert on October 06, 2013, 05:36:45 AM
Quote from: markmartin on October 05, 2013, 06:42:57 AM
Quote from: Bones on October 05, 2013, 03:15:24 AM
It's happened to me several times and I'll just look at it and go" You Bastard"        

You could try this:)  Wynn's 'Start You Bastard' Engine Additive Advert (http://www.youtube.com/watch?v=cY1YndLmbXQ#)


While the stuff above was a send up, the item below is an actual product readily available from all the major auto stores.

(https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRYjaD1pkgHUFQbmloW-ZgN0Zak84JXGebnyhwuFagSDEjx5CGK)

Noel
Title: Re: 12003cv idle is no longer smooth
Post by: CelticTiger on October 06, 2013, 05:19:59 PM
Oh, go on & whip them off and give them a damn good clean. Believe it or not Doc on  the Fudge site recommends you clean them out in the dishwasher!!! I read a report of a guy that tried it and the optimum temp is 40, not above. I'm definitely tackling mine over the winter as I want her running 100% for 2014! I can send you a couple of pdf's if you think the info would help?

Regards,

Conor
Title: Re: 12003cv idle is no longer smooth
Post by: keand3 on October 25, 2013, 02:20:03 AM
Quote from: CelticTiger on October 06, 2013, 05:19:59 PM
Oh, go on & whip them off and give them a damn good clean. Believe it or not Doc on  the Fudge site recommends you clean them out in the dishwasher!!! I read a report of a guy that tried it and the optimum temp is 40, not above. I'm definitely tackling mine over the winter as I want her running 100% for 2014! I can send you a couple of pdf's if you think the info would help?

Regards,

Conor

+1  :good2: