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25-04-22, 08:23 PM | #1 |
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sv650s K5 won't idle when petrol isn't a full tank (running rich)
Good evening! Thank you for letting me join the forum.
I'm having problems with my bike and I'm hoping someone will know what may be wrong. I have a 2005 SV650s which has ran perfectly for 15 years until this idling problem. This bike is standard except for a Delkevic slip on that was installed 5 years ago. It ran 3 years with no problems after this change was made. I have a problem where the bike now has issues idling without stalling. This has been going on for 2 years now, though admittedly covid meant I haven't been out on the bike so much. This seems to only happen when the tank is getting lower on fuel. It runs well with a full tank, then after a bit, it's a pain in the neck. (after filling it while on the side stand, the problems start around 35 miles used from full.) Issues experienced when fuel is lower:
Other observations:
Things I've done to try fix it:
My dad is wondering if it's the TPS sensor that needs replacing. Unfortunately TPS sensors are around £100 each, which is a lot to spend on a guess. Any clues where to start? Any guidance would be amazing. Thank you. (**** FIXED - IT WAS A DUFF BATTERY ****) Last edited by Blackie; 08-05-22 at 07:13 PM. |
26-04-22, 11:54 AM | #2 |
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Re: sv650s K5 won't idle when petrol isn't a full tank (running rich)
ageing battery, spark plugs, Rectifier/Regulator i would say are the three main contenders to look at first. i had pretty much the same symptoms last year and it turned out to be a duff battery even though the battery took a charge.
less common is the ignition and the Rectifier/Regulator connectors and the mantels in the injectors. you can check and roughly adjust the TPS without the engine running. |
26-04-22, 11:58 AM | #3 |
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Re: sv650s K5 won't idle when petrol isn't a full tank (running rich)
I think if it was TPS, or any electronic component, you would get the FI warning light and code which I take hasnt happened?
It seems to be more a mechanical type problem like a fuel or air leak. How many miles has the bike done and do you know if the maintenance schedule been followed? |
26-04-22, 01:02 PM | #4 |
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Re: sv650s K5 won't idle when petrol isn't a full tank (running rich)
I had something similar on a different bike some years ago. The bike was running rich all the time and it was caused by a faulty temp sensor which was telling the "brain" it was running cold so it was constantly in cold start mode.
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26-04-22, 01:30 PM | #5 | |
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Re: sv650s K5 won't idle when petrol isn't a full tank (running rich)
Quote:
I never thought of the battery. I usually change it every 2 or 3 years, but things have been a bit slack due to covid spoiling my fun. This problem has been going on 2 years now. Would a poor battery cause the bike to run rich also? I'll get a new battery just incase, it's due a change anyway. Cheers! |
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26-04-22, 01:34 PM | #6 | |
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Re: sv650s K5 won't idle when petrol isn't a full tank (running rich)
Quote:
There is no other warning. Are SV's quite intuitive for errors on electrics? I read I can run a diagnostic check on it but didn't know if this was something worth taking further or not. (I'm not used to vehicles that tell you what's wrong ) I did assume it was an air problem. The bike has only done 16k and has been garaged nearly all its life. |
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26-04-22, 01:38 PM | #7 | |
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Re: sv650s K5 won't idle when petrol isn't a full tank (running rich)
Quote:
Hmmmm... well it starts ok whether full tank or not, and quietly warms up before the revs drop. The bike does smell a bit fuely all the time though, regardless of how full the tank is. Do you think this would come up with a diagnostic test? Krikey, this is what gets me with bikes. There could be so many blooming things at fault LOL. And it takes trial and error with numerous cures, to finally get the problem solved. |
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26-04-22, 01:48 PM | #8 |
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Re: sv650s K5 won't idle when petrol isn't a full tank (running rich)
Does it happen when the bike is cold as well as hot?
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26-04-22, 01:54 PM | #9 |
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Re: sv650s K5 won't idle when petrol isn't a full tank (running rich)
Hard to judge because I don't run the bike cold cold... I wait for it to reach 40c.. and as its warming up it idles at higher revs anyway. In saying that, I think I remember seeing it idling at 1400 / 1500 revs the other day while warming, where it should probably be more.
When I do take away at 40c and the tank is lower in fuel, it does the same crappy idle though, yes. I've gotten really good at keeping the throttle on a little at junctions! |
26-04-22, 02:10 PM | #10 |
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Re: sv650s K5 won't idle when petrol isn't a full tank (running rich)
Ok. Just trying to work out of it's an electrical resistance problem exagerated by heat, which it sounds like it isn't if it does it relatively soon after starting too.
I'd be looking at fuel filter, injectors and air lines, air filter. Also double check your TPS before doing anything to rule that out to start with.
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