BA
Pro
Posts: 1592
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posted January 02, 2006 05:42 PM
Need help - re: RPM's not coming back down..
Actually, I have two questions. 
1. When putting your first miles on a new engine rebuild, would you expect to see any exhaust smoke until the rings seat? If so, how long might that take, assuming a proper engine build? 20 miles, 50 miles, 100miles? (not the *full* ring seat, just a little tail pipe smoke when you 'rap' the gas or get into it)
2. On wheel stands and in nuetral, my RPM's aren't always coming back down as they should EVEN THOUGH the throttle is snapping back. I can rev it up to 3000-5000 and sometimes it'll settle back in at 3000 and sit there. Whack the throttle open again, and it'll drop back to a proper idle.
I'm watching the linkage on the throttle-bodies and it's resting against the idle adjuster as it should when the problem happens. What the heck causes this?
The only thing that I can think of that has 'changed' with the TB's is that they were taken off so that the 1290 kit could be put in. Do I need to have them re-sync'd?
Thanks!
  
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CrotchRocket
Moderator
Bracket Racing with Betsy
Posts: 8038
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posted January 02, 2006 05:53 PM
What color is the smoke???
You sure the Power Commander is good, you should get a brand new one!!!
The injectors maybe clogged or may need to be sychronized!!!
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Jason Miller StreetBike Seminars
*****DragRacers do it better, because they dont cut Corners*****
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Ra12r
Zone Head
Posts: 919
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posted January 02, 2006 06:26 PM
 Edited By: Ra12r on 2 Jan 2006 18:28
1) You lost the map in the PC3, so REINSTALL the map.
2) The bike is running lean and needs some more fuel in the first two colomns in the 0% Throttle position.
3) To much overlap in the cams.
4) You may see a little smoke on the "hard flick" of the throttle, but it should NOT be smoking running down the road. There is NO seat time of the rings with the nickelsil plating and the type of ring coating used.
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All must bow to the "Ra Supremecy"...
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aliveagain
Needs a life
Posts: 5033
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posted January 02, 2006 07:09 PM
check your vacuum lines
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I wondered why the baseball kept getting bigger. Then it hit me.
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ninja12
Needs a job
Posts: 3310
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posted January 03, 2006 10:47 AM
quote:
1) You lost the map in the PC3, so REINSTALL the map.
2) The bike is running lean and needs some more fuel in the first two colomns in the 0% Throttle position.
3) To much overlap in the cams.
4) You may see a little smoke on the "hard flick" of the throttle, but it should NOT be smoking running down the road. There is NO seat time of the rings with the nickelsil plating and the type of ring coating used.
what he said!
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BA
Pro
Posts: 1592
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posted January 03, 2006 02:44 PM
Ok, great, those are good tips.
Here's some more info: PC3 map is re-re-installed. It's a 1290 map that I had noticed from someone here or over at the other site so I expect it to be pretty darn close. There are some numbers in the 0% and 5% columns that are higher than what I had on the stock engine.
The cams were spec'd at around 103/105. (give or take a couple of tenths)
Sadly, the smoke was whitish/blue and it lingered. It was getting to be dusk/darkish out so I couldn't really notice any over-richness or blackness to it. I need to try it again in the daytime I guess.
I need to re-check the vacuum lines.
Should I run some injector cleaner in my gas to see if that helps??
(I don't have any nutec laying around.)
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MadMike
Moderator
FEAR THE BLACK FLAG!!!!!!!!
Posts: 6579
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posted January 03, 2006 05:57 PM
what was your cranking pressure?
that will give you an idea of the rings...
also there might be some build smoke, so I would wait untill you had a hundred miles or so, UNLESS it gets worse at all OR you hear any noise....
____________
200-MPH CLUB MEMBER!
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BA
Pro
Posts: 1592
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posted January 03, 2006 08:22 PM
I don't have those numbers handy, BUT, the Leakdown test was 10, 12, 9, 9. One would *think* that these numbers would mean no piston blow-by. <>
My brain says "put some miles on it", but my gut and previous experience with this hunk o junk says I may have an issue.  (on the oil tip)
Still confused about the stuck RPM's though. Wish I had a non wet, warmer than 40 degree day to ride a bit.
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MadMike
Moderator
FEAR THE BLACK FLAG!!!!!!!!
Posts: 6579
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posted January 03, 2006 08:51 PM
On your RPM's double check the throttle cables....sometimes they get out of adjustment on the screw adjusters. make sure they both have the same amount of slack even very small amount....
Mad Mike
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200-MPH CLUB MEMBER!
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speedgene
Zone Head
Posts: 996
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posted January 03, 2006 10:23 PM
Get a fire extinguisher, and work outside. No reason to cook the house down.
Check MadMike's suggestion before you begin. Get the bike running. Better do this with a cold engine as soon as it lights up. Spry the injectors (WD-40) at the base o-ring. (If carbs, spray the spigots at the head first, then work back to the where the carb sets in the other end of the spigot boot). You should hear either a rise, or drop in rpm when spraying WD at any intake area. This is your intake idle leak. For now, it sounds more of a physical problem than an electronic one. So yes, inspect the sync balance.
Leakdown are the better numbers to read. 1 to 2% leakdown is ready to rock&roll. With 12% leakdown, don't race for money, or pink slips.
Those numbers are borderline teardown. Sounds like your rings didn't take if they are new. You have an oil smoke problem, and I'd start with cylinder 12% for a lightly wet plug.
Was this a full rebuild, a gasket leak change, a ring and hone deal, new valve job? More history please, or you can determine by lighting a cold bike off in the morning. If you see a puff of smoke and it goes away, then it's worn guides/seals. If the bike has a ring problem, then it will smoke when the engine is usually running. A puff here, a puff there at some rpms...to smoking at any rpm will be ring failure.
Turn the warm engine off. Remove your oil fill cap. Take a smell in the filler hole. If it smells like smokey exhaust, then yeah, the rings didn't take. You got a little blow-by to boot. The percentage leak is blowing inside your crankcase as well a blowing out the exhaust.
You have a narrow window to seat the rings. My guess is 10 miles, or less of... WOT redline running.
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E-tard
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