Jumping and Bucking - SV1000 Portal
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post #1 of 12 (permalink) Old 5th August 2020, 11:11 PM Thread Starter
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Icon15 Jumping and Bucking

Hey all,

Have an 03' s1k and experiencing as of the last couple weeks crazy bucking under heavy load. I synced throttle bodies, changed plugs, and just did the HP filter bypass to go along with a new fuel pump. It still HATES WOT. Bike has gsxr1k forks and gsxr1k ohlins shock. Any advice would be greatly appreciated. If I can't get WOT she's getting sold ASAP.

Runs like a dream all other times but WOT
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post #2 of 12 (permalink) Old 6th August 2020, 03:27 AM
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This will sound crazy but start using 87 octane gas if you've been using premium.


I bought a used '06 SV1000S a couple of years ago and it ran like crap. I replaced the fuel pump in it for the one in my crashed '05, put in new spark plugs, balanced the throttle bodies, set the TPS, and got the fuel injectors cleaned. But the horrible running at high RPMs with misfiring so bad, it nearly threw me off the bike at high RPM continued. By pure coincidence, I filled the tank up with 87 octane instead of the 93 premium I had been using and to my bewilderment, the bike ran perfectly after that.


Here's my thread about that bike:https://www.sv-portal.com/forums/4-s...mber-4-me.html


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post #3 of 12 (permalink) Old 6th August 2020, 05:48 AM
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Gotta be something else than the fuel octane..... i run 98 and never have an issue (our 98 is about 93-95 in your language Mr Bald....)

One owner..... 313,000kms and counting...

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post #4 of 12 (permalink) Old 6th August 2020, 09:12 AM
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Quote:
Originally Posted by Missing Link
Gotta be something else than the fuel octane..... i run 98 and never have an issue (our 98 is about 93-95 in your language Mr Bald....)
I used premium 93 ethanol-free gas (because it's the only ethanol-free gas available in my local area) for over a year in my '05 without any problems too. I hate the ethanol stuff and it's the main reason I was using it in that used '06 I got and was astounded when it ran perfectly after switching to cheap, low octane gas. Anyway, it certainly could be something else like needing to snip off a few mm of spark plug wires (try that cccfinly if switching to a lower octane gas doesn't work) but it's low hanging fruit to try a lower octane gas.


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post #5 of 12 (permalink) Old 6th August 2020, 03:47 PM Thread Starter
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Quote:
Originally Posted by oldbaldsob View Post
This will sound crazy but start using 87 octane gas if you've been using premium.
Ok thanks, I'll send update when I get back from testing 87 out a bit
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post #6 of 12 (permalink) Old 7th August 2020, 01:12 AM Thread Starter
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No luck after first ride... but I'll keep using 87 and see if it gets better after a tank or 2


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post #7 of 12 (permalink) Old 7th August 2020, 05:58 AM
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yeah, it will be still boosted by the remaining higher octane juice..... another tankful will reveal it.....

Me thinks it something else doing it......

One owner..... 313,000kms and counting...

2003 Copper SV1000S
Repainted Ford PE (Petroleum Mica)
Yoshi 2:1 collectors and Arrow titanium can...
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post #8 of 12 (permalink) Old 9th August 2020, 10:38 PM Thread Starter
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Originally Posted by Missing Link View Post
Me thinks it something else doing it......
I'm all ears...


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post #9 of 12 (permalink) Old 10th August 2020, 06:02 AM
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Set the STPS.... the Secondary TPS on the top butterflies....

First, wind the motor so they are flat, and make sure they are flate in the bodies, adjust to suit......
Then wind them wide open....
The disconnect the STPD plug, look at the socket and connect ohm meter to the yellow and black connectors (i thnk thats the colours)

Look for 4.38ohm....adjust the STPS to suit..... if you cant get that reading, its stuffed..... if you can get it, take it for a run and see how you go....

If it is too far out of wack it will cause all sorts of shit...

One owner..... 313,000kms and counting...

2003 Copper SV1000S
Repainted Ford PE (Petroleum Mica)
Yoshi 2:1 collectors and Arrow titanium can...
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post #10 of 12 (permalink) Old 10th August 2020, 10:12 AM
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@cccfinly send me a PM with your email and i can send you a couple of maps i have...... i cant upload them as they .djm files and the site wont allow it....

One owner..... 313,000kms and counting...

2003 Copper SV1000S
Repainted Ford PE (Petroleum Mica)
Yoshi 2:1 collectors and Arrow titanium can...
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post #11 of 12 (permalink) Old 10th August 2020, 07:24 PM
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@cccfinly, do a search using "misfire". You'll get lots of good ideas for things to check.

One person had his higher RPM misfire/surging issue resolved after troubleshooting his charging system issues:https://www.sv-portal.com/forums/1852302697-post47.html
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post #12 of 12 (permalink) Old 10th August 2020, 09:36 PM
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Quote:
Originally Posted by oldbaldsob View Post
One person had his higher RPM misfire/surging issue resolved after troubleshooting his charging system issues:https://www.sv-portal.com/forums/1852302697-post47.html
Yeah, hadn't thought of that...... well worth a look as well.... quicker to check and diagnose too......

One owner..... 313,000kms and counting...

2003 Copper SV1000S
Repainted Ford PE (Petroleum Mica)
Yoshi 2:1 collectors and Arrow titanium can...
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