238mph
Pro
Posts: 1145
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posted October 23, 2005 07:27 PM
12 motor hunting up and down at idle
Aboput 7000 miles on my 2002... and all of the sudden now the 12 is hunting up and
down at idle... drops to 700 rpm and then goes up to 1200 rpm...
Pissing me off...any ideas where I should start???
____________
Pilot Powers took me to the grave, and brought me back...
   
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lietoome
Needs a job
Posts: 2033
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posted October 23, 2005 09:03 PM
Check your TPS?
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lietoome
Needs a job
Posts: 2033
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posted October 23, 2005 09:04 PM
Thats my shot in the dark, don't accuse me of being a mechanic! Jere, have you thought about putting an exhaust on it?
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psycho1122
Pro
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posted October 24, 2005 06:51 AM
Vaccume leak
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You say PSYCHO like it's a BAD thing!!
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238mph
Pro
Posts: 1145
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posted October 24, 2005 06:54 AM
quote:
Thats my shot in the dark, don't accuse me of being a mechanic! Jere, have you thought about putting an exhaust on it?
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Pilot Powers took me to the grave, and brought me back...
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ninja12
Needs a job
Posts: 3310
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posted October 24, 2005 07:04 AM
 Edited By: ninja12 on 24 Oct 2005 08:04
Do you have a pc3?
Did you let the battery die?
If so re-map it.
Pc3's do strange things when the battery goes down.
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238mph
Pro
Posts: 1145
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posted October 24, 2005 07:07 AM
No PC3 on the bike.... stock except for a pipe...
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Pilot Powers took me to the grave, and brought me back...
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dougmeyer
Needs a job
moderated
Posts: 2713
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posted October 24, 2005 10:03 AM
Which pipe?
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lietoome
Needs a job
Posts: 2033
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posted October 24, 2005 12:07 PM
"Which pipe?"
I think this needs a photo to get the full jist of what kind of exhaust it is.
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238mph
Pro
Posts: 1145
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posted October 24, 2005 01:50 PM
Thanks a lot Jeff
it's a factory stock pipe... with a few mods... no cat... open tip.
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Pilot Powers took me to the grave, and brought me back...
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dougmeyer
Needs a job
moderated
Posts: 2713
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posted October 24, 2005 03:15 PM
Well, there ya go. Incorrect (insufficient) exhaust back pressure will cause a hunt at idle. To prove this to yourself, partially cover the exhaust outlet and the hunt will settle down.
D.
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trenace
Needs a job
Posts: 3056
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posted October 24, 2005 03:49 PM
Edited By: trenace on 24 Oct 2005 16:50
238 has been running this setup for some time but apparently the problem is new.
I am going to guess that the situation is that the fueling was previously right on the edge of what would have given a hunt with the modified can, and for some reason has changed with time and gone over the edge now, running just a little leaner for whatever reason.
I had a pretty bad hunt on switching to the Brock Megaphone pipe, but going (per Brock's map) at zero throttle +14 at 1000-1500 rpm while leaving 500-750 rpm unchanged cured the hunt.
(On the possibility that the very fractional throttle settings might matter also, don't know, at 2% throttle they were +8, +24, and +18 at 1000, 1250, and 1500 rpm respectively; and at 5% throttle, +0, +23, and +5.)
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238mph
Pro
Posts: 1145
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posted October 24, 2005 04:12 PM
Edited By: 238mph on 24 Oct 2005 17:13
Tren is right... I've run this setup almost from day one, with super crisp throttle response
and no hunting at all.... but I now have 8000 miles on the bike, with nothing but oil changes
along the way.
Gunner gave it to me bad over the phone... telling me I need to get off my ass and do
everything from valves to plugs, filters etc... hell I haven't even put on the braided brakes
lines and pads... sitting there for 6 months.
In Arizona WE RIDE YEAR ROUND... unlike you snow dogs that can work on your bikes
8 months out of the year...
I need a spare bike... like a 10, BECAUSE THE 14 SUCKS OUT LOUD!!!
____________
Pilot Powers took me to the grave, and brought me back...
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lietoome
Needs a job
Posts: 2033
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posted October 24, 2005 04:37 PM
8000 miles? AND you can ride year round? Jere, you got too many damn toys my friend. I'm on the way to help you out!
Didn't you post that you were getting 100 Octane at the pump awhile back? Call it a longshot, but maybe it just don't like the good stuff? My best stab at it.
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trenace
Needs a job
Posts: 3056
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posted October 24, 2005 04:49 PM
I wonder if fuel pressure dropping a little, or the injectors starting to get a little clogged, are in this case accounting for going a little lean?
Not the only possible reasons though.
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238mph
Pro
Posts: 1145
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posted October 24, 2005 05:00 PM
quote:
8000 miles? AND you can ride year round? Jere, you got too many damn toys my friend. I'm on the way to help you out!
Didn't you post that you were getting 100 Octane at the pump awhile back? Call it a longshot, but maybe it just don't like the good stuff? My best stab at it.
I put the good stuff in the Indy Car, not the bike...
Tren, it might be a possibility... do other people ever run some of that injector cleaner
through their bike???
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Pilot Powers took me to the grave, and brought me back...
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lietoome
Needs a job
Posts: 2033
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posted October 24, 2005 05:00 PM
Definitely check your vacuum lines. I had simular issues before I did the pilot jet mod.
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238mph
Pro
Posts: 1145
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posted October 24, 2005 05:01 PM
And if so, what kind????
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Pilot Powers took me to the grave, and brought me back...
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trenace
Needs a job
Posts: 3056
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posted October 24, 2005 05:03 PM
I use the Chevron Techron cleaner very frequently, as well as run Chevron whenever I can. However that doesn't prove that not doing so tends to lead to a problem, I don't know on that.
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238mph
Pro
Posts: 1145
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posted October 24, 2005 05:07 PM
I guess I need to get off my ass and do some fresh plugs etc... but I'm going to do some
injector cleaner...
I just have too much stuff to try to care for ... need to have a sale... I feel bad that I'm not
taking care of my shit...  That's not like me, but I'm getting old... the dog still likes to
hunt  but he's getting old... I'd rather sleep in, watch movies, chase pussy...
____________
Pilot Powers took me to the grave, and brought me back...
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ozzy
Needs a job
need guberment cheese
Posts: 3172
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posted October 24, 2005 05:14 PM
Speaking of fuel regulators, does anyone know of an adjustible one for the 12R?
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gunner
Needs a life
Posts: 5778
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posted October 24, 2005 05:58 PM
Edited By: gunner on 24 Oct 2005 18:59
quote:
Gunner gave it to me bad over the phone... telling me I need to get off my ass and do
everything from valves to plugs, filters etc... hell I haven't even put on the braided brakes
lines and pads... sitting there for 6 months.
quote]
Now that's not exactly what I said I said to put her up on stands and remove all her clothes and rub her all over every inch lookin for problems  It was only then that I realized that we had changed subjects and were talking about your bike again 
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five 0
Expert Class
Posts: 215
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posted October 24, 2005 06:10 PM
These motors do this alot in our race cars. Never can tell what causes it. BUT adjust the idle up alittle and that seems to cure it.
5-0
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trenace
Needs a job
Posts: 3056
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posted October 24, 2005 06:12 PM
My guess on why the 12 is on the edge of it (and sometimes over the edge of it) is big cams.
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tuusinii
Pro
Posts: 1031
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posted October 24, 2005 11:03 PM
Check the throtlle balance and TPS. It's a time for valve check and airfilter cleaning too - wouldn't You think? If You have KLEEN on maybe good to clean that one too.
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