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Discussion Starter · #1 ·
Hi guys, so I'm not sure where to start here but I've been a member for a really long time. I just finished rebuilding my sv1k and I invested a lot of time and money making it what I want it to be. Now that it's basically finished, I'm having an issue with irregular idle. I have the idle set around 1300 rpm at cold start but when the bike warms up it goes to 1400. I looked at the fuel system and everything looks correct. The stock fuel filter has been bypassed with a Mahler filter taking over the filtration. Would this be a throttle body sync issue? I'd genuinely appreciate the help. I have the stunt cage on there because I'm trying to build up my confidence with cornering. I went off a cliff 4 years ago and I'm still a bit shooken up from it. I also just bought a race mount m4 exhaust which I installed over the weekend. It sounds beautiful even though it's very expensive.
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Disturbed, very...
2003 SV1000S
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Fantastic colour buddy...

I always havee my bike set to 1400 idle.....though, not knowing where you are altitude wise, if you have the bike set at 1300 at a high altitude and then ride down a decent mountain, the idle will increase.

Check the cold idle clearance on the stepper motor n the forn throttle body. Once that is set, i assume you hae the -C00 set at the middle at 1400 and it goes to the top at 1750....(seems the best setting all round)
Also, check the STPS OHMs...... black to yellow ahould be 4.38 fully open, engine off, connector apart....open the secondary buttrfies by turning the steppe rmotor by hand.
 
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Discussion Starter · #3 ·
Fantastic colour buddy...

I always havee my bike set to 1400 idle.....though, not knowing where you are altitude wise, if you have the bike set at 1300 at a high altitude and then ride down a decent mountain, the idle will increase.

Check the cold idle clearance on the stepper motor n the forn throttle body. Once that is set, i assume you hae the -C00 set at the middle at 1400 and it goes to the top at 1750....(seems the best setting all round)
Also, check the STPS OHMs...... black to yellow ahould be 4.38 fully open, engine off, connector apart....open the secondary buttrfies by turning the steppe rmotor by hand.
Thanks for the recommendation, I'll check it out. I'm in the San Francisco area so I don't think sea level is the challenge here but I'll take a look at the throttle body and see what I can do. I did readjust the TPS last week since it was definitely not aligned which fixed some of the problems but not all. I may try to resync the throttle body and see what that does too.
 

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Hi guys, so I'm not sure where to start here but I've been a member for a really long time. I just finished rebuilding my sv1k and I invested a lot of time and money making it what I want it to be. Now that it's basically finished, I'm having an issue with irregular idle. I have the idle set around 1300 rpm at cold start but when the bike warms up it goes to 1400. I looked at the fuel system and everything looks correct. The stock fuel filter has been bypassed with a Mahler filter taking over the filtration. Would this be a throttle body sync issue? I'd genuinely appreciate the help. I have the stunt cage on there because I'm trying to build up my confidence with cornering. I went off a cliff 4 years ago and I'm still a bit shooken up from it. I also just bought a race mount m4 exhaust which I installed over the weekend. It sounds beautiful even though it's very expensive. View attachment 118027
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Hi I have a 2003 sv1000 7k miles.. Every once in a while when I give it gas off idle , I get a backfire ..
my tps is on the money. Every thing else checks out ..then other times it never happens
 

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KNEE DRAGGER
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Thanks for the recommendation, I'll check it out. I'm in the San Francisco area so I don't think sea level is the challenge here but I'll take a look at the throttle body and see what I can do. I did readjust the TPS last week since it was definitely not aligned which fixed some of the problems but not all. I may try to resync the throttle body and see what that does too.
You need to sync throttle bodies first, then set full warmed up idle speed, then set TPS.

Make sure you have no vac leaks.

If you did the bypass on the fuel filter, that does not assure that you have proper fuel pressure, so check that. I am seeing so many bikes that have fuel pressure issues these days it drives me crazy.

-ms
 

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Discussion Starter · #6 ·
You need to sync throttle bodies first, then set full warmed up idle speed, then set TPS.

Make sure you have no vac leaks.

If you did the bypass on the fuel filter, that does not assure that you have proper fuel pressure, so check that. I am seeing so many bikes that have fuel pressure issues these days it drives me crazy.

-ms
What are the fueling problems you're seeing? I don't have kinks in the fuel line and it's a Mahler filter that was recommended on this forum.
 

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KNEE DRAGGER
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What are the fueling problems you're seeing? I don't have kinks in the fuel line and it's a Mahler filter that was recommended on this forum.
I am seeing all kinds of fueling issues…

I have seen the regulators go bad and the pressure oscillate so bad at idle you will get a misfire blow back through the intake.

I have seen bleed out at the high pressure output o-rings and at the nose seal of the pump.

I have seen the regulators get partially popped out on the 03/04 fuel assemblies due to the plastic clips not holding correctly.

I have also seen low pressure and as soon as you apply throttle the pressure drops to near zero then recovers rapidly after.

-ms
 

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KNEE DRAGGER
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What are the fueling problems you're seeing? I don't have kinks in the fuel line and it's a Mahler filter that was recommended on this forum.
Putting an external filter on does not mean you have proper flow and pressure.

-ms
 

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Discussion Starter · #9 ·
I am seeing all kinds of fueling issues…

I have seen the regulators go bad and the pressure oscillate so bad at idle you will get a misfire blow back through the intake.

I have seen bleed out at the high pressure output o-rings and at the nose seal of the pump.

I have seen the regulators get partially popped out on the 03/04 fuel assemblies due to the plastic clips not holding correctly.

I have also seen low pressure and as soon as you apply throttle the pressure drops to near zero then recovers rapidly after.

-ms
That's interesting, I'm getting infrequent misfires which first made me believe it was the spark plugs and coils. I checked the plugs (which only had 2k miles on them) that then made me think it was the coil. I bought Dynatech coils to replace them with but have not done the swap over yet since work has eaten most of my time.

I'll resync the tb and see what I find.
 

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We're also assuming you have the valve adjustment set correctly...yes? TB synch is very dependent on the valves all working at the same clearances, and if you have a sensitive meter like the TwinMax (which works well and can see a .001 valve adjustment change) so in order: valve adjustment, TB synch (3000 rpm works better than base idle) then TPS and base idle speeds keeping in mind that both are kind of dependent on the other so adjusting one might need the other tweaked. Make sure all the rubber in the intake tract is sound...especially the little rubber caps on the unused nipples which can split and leak.
 

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I found my intake flanges to be cracked by spraying brake clean aerosol around all vacuum areas.....makes the engine stagger a little, or a lot..... just sheild the intake of the throttle bodies
so you dont get a false positive that way...
 
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