Any way to lean out a 2nd GEN - Suzuki SV650 Forum: SV650, SV1000, Gladius Forums

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SV650 Gen2 (03-15) Tech Info, advice or questions specific to the 2003-2015 model SV650.

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Old 06-01-2019, 09:40 AM   #1
Wedgewood
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Any way to lean out a 2nd GEN

Hi there,
Is there anyway to lean out a 2003 without spending any/much money. I don't have access to any shops capable of remapping.

My bike runs pretty rich and sometimes can foul a plug because of it. There's a smell of gas coming from the exhaust and when I idle my tailbag will even pick up a gas smell. The inside of the exhaust pipe is black with a damp carbon build up.

My mileage is about 48-52MPG.

I've taken out the snorkel in the past and noticed a noxious smell as well as unsteady RPMs so I believe this might lean out the mixture a bit more. would this help my situation?

Thanks in advance for any replies
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Old 06-01-2019, 09:49 AM   #2
steveSLO
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Re: Any way to lean out a 2nd GEN

This is a question, not a suggestion.
Would tricking either the air mass or air temperature sensors be feasible?
Putting on a less restricted exhaust might help.
Are you sure the plugs aren't oil-fouled, sixteen years is a long time
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Old 06-01-2019, 10:15 AM   #3
Wedgewood
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Re: Any way to lean out a 2nd GEN

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Originally Posted by steveSLO View Post
This is a question, not a suggestion.
Would tricking either the air mass or air temperature sensors be feasible?
Putting on a less restricted exhaust might help.
Are you sure the plugs aren't oil-fouled, sixteen years is a long time
I have a yoshi slip on so it should be a little less restrictive than stock.

I'm not positive they're not oil-fouled but I have reason to believe it's caused by running rich. When I start the bike I can see mist coming from the exhaust while it warms up and the exhaust smells of gas. If I cover the exhaust opening with a paper towel it will almost immediately start to turn black. When the plug gets fouled it's usually after a long ride at lower RPMS (i usually don't ride lower RPMS but sometimes I will on the way home from a trip just out of laziness). When it fouls it will intermittently drop a cylinder and won't idle on it's own, A little jaunt at higher RPMS clears this up and seems to unfoul the plug.

I'm not sure of any method of tricking the air temp or air mass sensors...is there a know way to do this?
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Old 06-01-2019, 11:39 AM   #4
snailman153624
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Re: Any way to lean out a 2nd GEN

There is no airflow sensor, it just measures throttle angle and stv position, and engine speed.

Sounds like you might have a leaky injector. I would suggest removing it and have it cleaned/tested.

Oil is Def another possibility. If your rings aren't sealing well, fuel gets into the oil from blow by..and oil will smell like fuel.

You could try the teaspoon of seafoam in each cylinder trick and let it soak overnight to see if it frees up the rings.
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Old 06-01-2019, 11:55 AM   #5
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Quote:
Originally Posted by snailman153624 View Post
There is no airflow sensor, it just measures throttle angle and stv position, and engine speed.

Sounds like you might have a leaky injector. I would suggest removing it and have it cleaned/tested.

Oil is Def another possibility. If your rings aren't sealing well, fuel gets into the oil from blow by..and oil will smell like fuel.

You could try the teaspoon of seafoam in each cylinder trick and let it soak overnight to see if it frees up the rings.
Thanks for the advice. Is there any easy way to check these things without removing any parts? My garage space is quite small and dirty so it's hard to do big jobs.
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Old 06-01-2019, 06:56 PM   #6
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Re: Any way to lean out a 2nd GEN

Just how old are those plugs?
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Old 06-01-2019, 07:02 PM   #7
Wedgewood
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Re: Any way to lean out a 2nd GEN

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Just how old are those plugs?
They're less than a year old.
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Old 06-11-2019, 07:40 AM   #8
fastegg
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Re: Any way to lean out a 2nd GEN

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Originally Posted by Wedgewood View Post
They're less than a year old.
How old is the airfilter ?
i wonder if the TPS (throttle position sensor) is out of adjustment ?
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Old 06-11-2019, 09:02 AM   #9
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Re: Any way to lean out a 2nd GEN

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How old is the airfilter ?
i wonder if the TPS (throttle position sensor) is out of adjustment ?
It's old but very clean, still pretty much pure white. I also have a K&N air filter but it makes the bike run even richer...to the point where the front plug would constantly foul and there's pretty much a gasoline mist coming from the exhaust.
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Old 06-11-2019, 10:14 AM   #10
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Re: Any way to lean out a 2nd GEN

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Originally Posted by Wedgewood View Post
It's old but very clean, still pretty much pure white. I also have a K&N air filter but it makes the bike run even richer...to the point where the front plug would constantly foul and there's pretty much a gasoline mist coming from the exhaust.
If it runs richer with a K&N that would dictate the K&N is dirty. A K&N realistically should flow better than stock so not sure what's going on there. .. A couple of years ago my '04 was running rich everywhere... fouling plugs, fuming out the guys behind me, emptying the tank 50km too soon.... turned out to be a faulty TPS... it was telling the ecu to use more fuel than necessary... New TPS fixed it. I can't remember if there was a test for the TPS... I think my bike shop mechanic guessed that that was the problem.
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