Running poorly - carb stuck on choke. - SV650.org

23-12-04, 03:38 PM

I've had my 650S since new Dec 2000 and I've not really had any problems after 25000 miles. I'm still on the original chain/sprockets as I use a Scottoiler. I'm not too gentle with the 650 either, I use the 650 as the daily hack and have used it on track days at the streets of willow, CA. (Have a ZX-10R for the weekends).
About 2 weeks ago, since it was cold in the morning (35F is cold for San Diego) I started to use the choke in the morning. The bike has been running crap and the choke cable was 'tight' to use.
Lubed the cable/handle bar area - still the same and running even more crappy/lumpy.
Decide to look at the choke plunger in the carb bodies. The rear cylinder carb is easy to get to, front cylinder almost impossible without removing the complete carb. The rear carb plunger was gunged up and the return spring almost inoperable. I cleaned it all out and checked that the choke cable operated smoothly. Just something else to check if you have starting/running problems.
This morning - what a difference - starts easy and runs smoooooth.
Andy in SD
[/b]

embee · 23-12-04, 04:20 PM

Hi Andy
yep, that back choke cable end seemed to be a real problem.

Mine was only a few months old when it started to play up. Found white crusty stuff round the cable end/plunger, which I suspect came from the flux used to solder the cable end at manufacture.

Don't know why it seemed to affect the back one more than the front, but anyway it's been no trouble since it was cleaned and lubed.

northwind · 23-12-04, 07:42 PM

Mine was much the same... The front spring was a bit twisted, meaning it wasn't putting as much force on as it should, while the back spring was badly rusted and there was a rust buildup on teh carb which was causing the spring to jam...

24-12-04, 04:39 AM

hey Northwind - I'm actually from Edinburgh although now living in San Diego. Better weather here in SD than dreich Scotland!!
I will definitely check the front plunger in the carb as well although it is a bitch to get access without removing the complete carb.

northwind · 24-12-04, 04:48 PM

Yup, if I was going in there I'd take the carbs offf, though not out- I'd just lift them a little. And it's bloody freezing here! Rode up to Hillend today to get some snowballs, then rode bcak to my place and threw them at my brother

31-12-11, 04:24 PM

Hi I Have been storing my friends sv650s 2000 over last summer and this winter. I have been keeping the battery charged and occasionally starting the bike. The last 2 times i have not been able to turn the choke off even when running. The bike wont rev cleanly and pops and splutters a bit if you try to rev over 7000rpm. I thought I would take it for a little run, but it wouldnt pull up my drive very well so had to slip the clutch and coach it up some 80mtrs to a flat track. Its as if it is only running on 1 cylinder. There is hardly any smoke from the exhaust. Even when the engine is hot i struggle to turn off the choke as it stalls almost straightaway. The fuel tank was on reserve so I put another 4 ltrs of fuel in but made no difference.

Anyone got any new ideas please...cheers...And Happy New Year to ALL

)

23-12-04, 03:38 PM	#1
emc_andy Guest Posts: n/a	Running poorly - carb stuck on choke. I've had my 650S since new Dec 2000 and I've not really had any problems after 25000 miles. I'm still on the original chain/sprockets as I use a Scottoiler. I'm not too gentle with the 650 either, I use the 650 as the daily hack and have used it on track days at the streets of willow, CA. (Have a ZX-10R for the weekends). About 2 weeks ago, since it was cold in the morning (35F is cold for San Diego) I started to use the choke in the morning. The bike has been running crap and the choke cable was 'tight' to use. Lubed the cable/handle bar area - still the same and running even more crappy/lumpy. Decide to look at the choke plunger in the carb bodies. The rear cylinder carb is easy to get to, front cylinder almost impossible without removing the complete carb. The rear carb plunger was gunged up and the return spring almost inoperable. I cleaned it all out and checked that the choke cable operated smoothly. Just something else to check if you have starting/running problems. This morning - what a difference - starts easy and runs smoooooth. Andy in SD [/b]

23-12-04, 07:42 PM	#3
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,082	Mine was much the same... The front spring was a bit twisted, meaning it wasn't putting as much force on as it should, while the back spring was badly rusted and there was a rust buildup on teh carb which was causing the spring to jam... __________________ "We are the angry mob, we read the papers every day We like what we like, we hate what we hate But we're oh so easily swayed"

24-12-04, 04:39 AM	#4
emc_andy Guest Posts: n/a	front carb hey Northwind - I'm actually from Edinburgh although now living in San Diego. Better weather here in SD than dreich Scotland!! I will definitely check the front plunger in the carb as well although it is a bitch to get access without removing the complete carb.

24-12-04, 04:48 PM	#5
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,082	Yup, if I was going in there I'd take the carbs offf, though not out- I'd just lift them a little. And it's bloody freezing here! Rode up to Hillend today to get some snowballs, then rode bcak to my place and threw them at my brother __________________ "We are the angry mob, we read the papers every day We like what we like, we hate what we hate But we're oh so easily swayed"

31-12-11, 04:24 PM	#6
zorroman62 Guest Posts: n/a	Re: Running crap - carb stuck on choke! Hi I Have been storing my friends sv650s 2000 over last summer and this winter. I have been keeping the battery charged and occasionally starting the bike. The last 2 times i have not been able to turn the choke off even when running. The bike wont rev cleanly and pops and splutters a bit if you try to rev over 7000rpm. I thought I would take it for a little run, but it wouldnt pull up my drive very well so had to slip the clutch and coach it up some 80mtrs to a flat track. Its as if it is only running on 1 cylinder. There is hardly any smoke from the exhaust. Even when the engine is hot i struggle to turn off the choke as it stalls almost straightaway. The fuel tank was on reserve so I put another 4 ltrs of fuel in but made no difference. Anyone got any new ideas please...cheers...And Happy New Year to ALL )

23-12-04, 04:20 PM	#2
embee Member Mega Poster Join Date: Jul 2003 Location: Warwickshire Posts: 2,801	Hi Andy yep, that back choke cable end seemed to be a real problem. Mine was only a few months old when it started to play up. Found white crusty stuff round the cable end/plunger, which I suspect came from the flux used to solder the cable end at manufacture. Don't know why it seemed to affect the back one more than the front, but anyway it's been no trouble since it was cleaned and lubed.

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