SV650s K7 pointy - jerkiness and poor idle - SV650.org

12-04-13, 03:48 PM

Hi all,

I'm a complete newbie to the forum and SV owners clan after buying my first SV650s K7 on Saturday. Sadly already a couple of problems.

I have 2 issues which may or may not be related - I've done some digging around the forum but can't find any threads where both issues are present.

Bike specifics - 2007, scorpion can, otherwise standard, 48k miles.

issue 1 - jerkiness at low revs. I got the bike from a garage and they said it's a little jerky but they couldn't find anything causing it. It seems to be at about 4000-5000 rpm when at constant speed (never under acceleration) where it jerks intermittently. Looking at threads this could be TPS but then I also have the second issue...

issue 2 - once the engine is warm the idle is erratic, it drops from around 1200 to 900, constantly up and down. Occasionally it stalls and won't start again unless I give it a bit of throttle, but if i let go off the throttle it will instantly die. It takes a few times to get it going again. The idle is fine and constant on cold start and revs high until warm and then settles nicely after 10-20 seconds.

I'm not sure if the two issues are related or if they are seperate but it's annoying the hell out of me. I want to avoid taking the bike back to the garage to check it over if it's simple fix, or I can at least rule out a couple of things before hand as I need my bike to ride to work.

Any suggests from the trusty SV riders?

Thanks,

aesmith · 12-04-13, 05:34 PM

It's got to be worth a try adjusting the TPS, that's a cost free process if you've got a T25 security bit (I didn't so it cost me £1.85).

12-04-13, 06:18 PM

yeah i'll definitely give that a go over the weekend.

is that likely to be causing problems with the idle though?

aesmith · 12-04-13, 06:33 PM

I don't claim to be an expert on the SVs, but when I adjusted my TPS it certainly made the idle erratic when I moved it too far. I was also thinking that trying the adjustment might help you see if the sensor is behaving as it should.

12-04-13, 10:30 PM

I'm trying to pick up as much information on my SV as possible.
So could somebody please humour me ... What's TPS?

DarrenSV650S · 12-04-13, 10:33 PM

Therapeutic Penis Stimulator

12-04-13, 10:34 PM

Second for trying the tps(throttle position sensor), otherwise sounds like potentially a carb issue? Was the bike sat for long before you bought it?

12-04-13, 11:17 PM

Quote:

Originally Posted by DarrenSV650S

Therapeutic Penis Stimulator

Got to get me one of those !

Quote:

Originally Posted by stuR

Second for trying the tps(throttle position sensor )

Cheers Stur

Bibio · 13-04-13, 12:01 AM

i would check the TPS, Battery connections/condition and air/vacuum hoses. the hoses usually throw up an FI light on the dash.

other things to check, oil level, spark plugs and air filter.

Sid Squid · 13-04-13, 03:14 PM

Throttle balance first, then TPS.

Fairly common symptoms of unbalanced intake - and easy to check.

12-04-13, 03:48 PM	#1
dazza Guest Posts: n/a	SV650s K7 pointy - jerkiness and poor idle Hi all, I'm a complete newbie to the forum and SV owners clan after buying my first SV650s K7 on Saturday. Sadly already a couple of problems. I have 2 issues which may or may not be related - I've done some digging around the forum but can't find any threads where both issues are present. Bike specifics - 2007, scorpion can, otherwise standard, 48k miles. issue 1 - jerkiness at low revs. I got the bike from a garage and they said it's a little jerky but they couldn't find anything causing it. It seems to be at about 4000-5000 rpm when at constant speed (never under acceleration) where it jerks intermittently. Looking at threads this could be TPS but then I also have the second issue... issue 2 - once the engine is warm the idle is erratic, it drops from around 1200 to 900, constantly up and down. Occasionally it stalls and won't start again unless I give it a bit of throttle, but if i let go off the throttle it will instantly die. It takes a few times to get it going again. The idle is fine and constant on cold start and revs high until warm and then settles nicely after 10-20 seconds. I'm not sure if the two issues are related or if they are seperate but it's annoying the hell out of me. I want to avoid taking the bike back to the garage to check it over if it's simple fix, or I can at least rule out a couple of things before hand as I need my bike to ride to work. Any suggests from the trusty SV riders? Thanks,

12-04-13, 05:34 PM	#2
aesmith Member Join Date: Mar 2013 Location: Aberdeenshire Posts: 966	Re: SV650s K7 pointy - jerkiness and poor idle It's got to be worth a try adjusting the TPS, that's a cost free process if you've got a T25 security bit (I didn't so it cost me £1.85).

12-04-13, 06:18 PM	#3
dazza Guest Posts: n/a	Re: SV650s K7 pointy - jerkiness and poor idle yeah i'll definitely give that a go over the weekend. is that likely to be causing problems with the idle though?

12-04-13, 06:33 PM	#4
aesmith Member Join Date: Mar 2013 Location: Aberdeenshire Posts: 966	Re: SV650s K7 pointy - jerkiness and poor idle I don't claim to be an expert on the SVs, but when I adjusted my TPS it certainly made the idle erratic when I moved it too far. I was also thinking that trying the adjustment might help you see if the sensor is behaving as it should.

12-04-13, 10:30 PM	#5
Rogue_Shadow Guest Posts: n/a	Re: SV650s K7 pointy - jerkiness and poor idle I'm trying to pick up as much information on my SV as possible. So could somebody please humour me ... What's TPS?

12-04-13, 10:33 PM	#6
DarrenSV650S Member Mega Poster Join Date: Jul 2006 Location: Dundee Posts: 4,404	Re: SV650s K7 pointy - jerkiness and poor idle Therapeutic Penis Stimulator

12-04-13, 10:34 PM	#7
stuR Guest Posts: n/a	Re: SV650s K7 pointy - jerkiness and poor idle Second for trying the tps(throttle position sensor), otherwise sounds like potentially a carb issue? Was the bike sat for long before you bought it?

13-04-13, 12:01 AM	#9
Bibio Member Mega Poster Join Date: Jul 2008 Location: here as devil's advocate Posts: 11,540	Re: SV650s K7 pointy - jerkiness and poor idle i would check the TPS, Battery connections/condition and air/vacuum hoses. the hoses usually throw up an FI light on the dash. other things to check, oil level, spark plugs and air filter.

13-04-13, 03:14 PM	#10
Sid Squid No, I don't lend tools. Mega Poster Join Date: Jul 2003 Location: Skunk Works, Nth London Posts: 8,680	Re: SV650s K7 pointy - jerkiness and poor idle Throttle balance first, then TPS. Fairly common symptoms of unbalanced intake - and easy to check. __________________ If an SV650 has a flat tyre in the forest and no-one is there to blow it up, how long will it be 'til someone posts that the reg/rec is duff and the world will end unless a CBR unit is fitted? A little bit of knowledge = a dangerous thing. "a deathless anthem of nuclear-strength romantic angst"

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