Unhappy engine? - SV650.org

31-01-07, 03:30 PM

The bikes been layed up since the week before xmas so as I suspected no battery. Called the AA, put the phone down as that was my alcohol dependance one.. :-0 Called the right one and bike was duly started. Now though it's revving at about 3000 revs. So I twiddle the screw and get the revs down to normal - just over 1000 as I remembered and went out for a good run.

Found though that the bike is very weird, keeps jumping at constant throttle and especially noticable at under 30mph. I thought a good blast might clear it but seem not to be. Very weird, almost pulsing. At tick over you can hear the engine going up and down as well. It also cut out a couple of times during the ride and i had to adjust the tick over once. Any ideas?

Cheers
Sean

jambo · 31-01-07, 04:11 PM

Check to see if the choke is stuck

northwind · 31-01-07, 05:14 PM

Is ti a carbed model? sounds like a vacuum leak to me, could have split or loosened a hose when the tank was lifted.

31-01-07, 07:18 PM

i thought the engine had to idle at 1300 prm +/- 100. when i adjusted mine it was too low intially (about 1,100rpm) and the engine did act a bit wierd. moved it up a bit and now it is fine. make sure the engine is nice and hot when you make adjustments though.

31-01-07, 10:34 PM

The choke is normal. Not to sure about carbed - 2001 k1 curvey if that's any help. My girlfriend thinks it's the sparkplugs... could this be it?

northwind · 31-01-07, 10:39 PM

Sparks would make it run badly, wouldn't usually make it race. I bet you 10p it's a vacuum leak

21QUEST · 31-01-07, 10:51 PM

Quote:

Originally Posted by northwind

Sparks would make it run badly, wouldn't usually make it race. I bet you 10p it's a vacuum leak

...and I bet you another 10p it's the choke

Ben

northwind · 31-01-07, 10:59 PM

I'm accusing the vaccum, because nobody's done anything to mess with the choke

But lifting and dropping the tank could start a vacuum leak. But it wouldn't be the first time I've been wrong

21QUEST · 01-02-07, 12:16 AM

....but has anyone lifted the tank

Infact I'm so confident I'll raise my bet. One English £ to a Scottish £. Yeah yeah I know that's a steal of an "odd"

but I'm feeling flush

I suspect one or both choke plungers is partially seized.

Ben

northwind · 01-02-07, 12:41 AM

Ah, yes, there you have a point- for some reason I was stupidly thinking they'd have lifted the tank to jump start it. I have no idea why.

Oh well.

31-01-07, 03:30 PM	#1
seandixie Guest Posts: n/a	Unhappy engine? The bikes been layed up since the week before xmas so as I suspected no battery. Called the AA, put the phone down as that was my alcohol dependance one.. :-0 Called the right one and bike was duly started. Now though it's revving at about 3000 revs. So I twiddle the screw and get the revs down to normal - just over 1000 as I remembered and went out for a good run. Found though that the bike is very weird, keeps jumping at constant throttle and especially noticable at under 30mph. I thought a good blast might clear it but seem not to be. Very weird, almost pulsing. At tick over you can hear the engine going up and down as well. It also cut out a couple of times during the ride and i had to adjust the tick over once. Any ideas? Cheers Sean

31-01-07, 04:11 PM	#2
jambo Member Mega Poster Join Date: Aug 2003 Location: Croydonia Posts: 5,376	Check to see if the choke is stuck __________________ Modern motorcycles are bloody brilliant, enjoy it while we can

31-01-07, 05:14 PM	#3
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,083	Is ti a carbed model? sounds like a vacuum leak to me, could have split or loosened a hose when the tank was lifted. __________________ "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"

31-01-07, 10:39 PM	#6
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,083	Sparks would make it run badly, wouldn't usually make it race. I bet you 10p it's a vacuum leak __________________ "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"

31-01-07, 10:59 PM	#8
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,083	I'm accusing the vaccum, because nobody's done anything to mess with the choke But lifting and dropping the tank could start a vacuum leak. But it wouldn't be the first time I've been wrong __________________ "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"

31-01-07, 07:18 PM	#4
emcf Guest Posts: n/a	i thought the engine had to idle at 1300 prm +/- 100. when i adjusted mine it was too low intially (about 1,100rpm) and the engine did act a bit wierd. moved it up a bit and now it is fine. make sure the engine is nice and hot when you make adjustments though.

31-01-07, 10:34 PM	#5
seandixie Guest Posts: n/a	The choke is normal. Not to sure about carbed - 2001 k1 curvey if that's any help. My girlfriend thinks it's the sparkplugs... could this be it?

01-02-07, 12:41 AM	#10
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,083	Ah, yes, there you have a point- for some reason I was stupidly thinking they'd have lifted the tank to jump start it. I have no idea why. Oh well. __________________ "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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