Odd choke/running problem - SV650.org

northwind · 04-06-05, 07:59 PM

I noticed at the end of the week that while the bike fires first time with a little choke and runs nicely on the stand, as soon as I stand it up to ride the revs drop right down. It's not losing a cylinder- I know that feeling rather well

- but the idle speed drops like a stone. It picks up fine with a little throttle so it's not a problem, I'm just curious what could be causing it...

Richie · 04-06-05, 09:17 PM

Very very long shot here.... Not knowing the curvy modle carb's but ....maybe you have a float chamber float come unstuck and the needle is ok on the slant but the float needle drops, cutting down the flow of fuel when the bike is stright upright...

I know it sounds a long shot but it's the only thing I can think of.

northwind · 04-06-05, 11:20 PM

Doubt it could be that, since once it's warmed up it runs fine... Seems to be exclusively a problem when the engine's cold and the bike's been on the stand. Strange one

Richie · 05-06-05, 06:30 AM

Just ignor it, then the naughty bug's might go away...

northwind · 05-06-05, 06:00 PM

Not a bad plan... Or it'll get worse and a piston'll fly out and hit me in the face, but either way it'll solve the bad running problem

dirtydog · 05-06-05, 06:07 PM

true, but im sure youd rather it didnt do either of those and just behaved its self

northwind · 05-06-05, 06:49 PM

It's not a big deal, compared to the half dozen other intermittant faults it's picked up while laid up

dirtydog · 05-06-05, 06:56 PM

Richie · 05-06-05, 09:21 PM

Why not try some carb cleaner through it... Might just be a sticky bug type thing that ........ I'll get my coat

northwind · 05-06-05, 09:51 PM

Thing is, I'm not sure how it could be a blockage or similiar since the bike idles and pulls right at all other times. It only lasts maybe 20 seconds or so after I take it off the stand too, which would make me suggest float levels or something, as if it were going out of whack while on its side but adjusting, then having to readjust while stood up. But if it were that, it should go wrong on long corners.

Stumped

But never mind, I fixed the clutch (well, put off having to strip it anyway) and the rear brake light today so the list's getting shorter. It's going in for rejetting as soon as I get my act together and all the little things fixed so the mechanics don't take the mick, that might sort it out.

04-06-05, 07:59 PM	#1
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,082	Odd choke/running problem I noticed at the end of the week that while the bike fires first time with a little choke and runs nicely on the stand, as soon as I stand it up to ride the revs drop right down. It's not losing a cylinder- I know that feeling rather well - but the idle speed drops like a stone. It picks up fine with a little throttle so it's not a problem, I'm just curious what could be causing it... __________________ "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"

04-06-05, 09:17 PM	#2
Richie fantabulas Mega Poster Join Date: Apr 2004 Location: Nr Durham Posts: 4,940	Very very long shot here.... Not knowing the curvy modle carb's but ....maybe you have a float chamber float come unstuck and the needle is ok on the slant but the float needle drops, cutting down the flow of fuel when the bike is stright upright... I know it sounds a long shot but it's the only thing I can think of. __________________ My Flickr photos

04-06-05, 11:20 PM	#3
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,082	Doubt it could be that, since once it's warmed up it runs fine... Seems to be exclusively a problem when the engine's cold and the bike's been on the stand. Strange one __________________ "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"

05-06-05, 06:30 AM	#4
Richie fantabulas Mega Poster Join Date: Apr 2004 Location: Nr Durham Posts: 4,940	Just ignor it, then the naughty bug's might go away... __________________ My Flickr photos

05-06-05, 06:00 PM	#5
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,082	Not a bad plan... Or it'll get worse and a piston'll fly out and hit me in the face, but either way it'll solve the bad running problem __________________ "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"

05-06-05, 06:07 PM	#6
dirtydog Knob faced knobster Mega Poster Join Date: Jan 2005 Location: Haslemere Posts: 5,419	true, but im sure youd rather it didnt do either of those and just behaved its self __________________ 2001 SV650 in shimmerin green, Not broken anymore

05-06-05, 06:49 PM	#7
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,082	It's not a big deal, compared to the half dozen other intermittant faults it's picked up while laid up __________________ "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"

05-06-05, 06:56 PM	#8
dirtydog Knob faced knobster Mega Poster Join Date: Jan 2005 Location: Haslemere Posts: 5,419	__________________ 2001 SV650 in shimmerin green, Not broken anymore

05-06-05, 09:21 PM	#9
Richie fantabulas Mega Poster Join Date: Apr 2004 Location: Nr Durham Posts: 4,940	Why not try some carb cleaner through it... Might just be a sticky bug type thing that ........ I'll get my coat __________________ My Flickr photos

05-06-05, 09:51 PM	#10
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,082	Thing is, I'm not sure how it could be a blockage or similiar since the bike idles and pulls right at all other times. It only lasts maybe 20 seconds or so after I take it off the stand too, which would make me suggest float levels or something, as if it were going out of whack while on its side but adjusting, then having to readjust while stood up. But if it were that, it should go wrong on long corners. Stumped But never mind, I fixed the clutch (well, put off having to strip it anyway) and the rear brake light today so the list's getting shorter. It's going in for rejetting as soon as I get my act together and all the little things fixed so the mechanics don't take the mick, that might sort it out. __________________ "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"

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