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Old 07-02-2012, 07:21 AM   #4276
Gros Buck
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Quote:
Originally Posted by wino975 View Post
backfire: I'm looking for a solution to avoid it ... I'm thinking to build a "cage" and fix it to the unused motor support viewable in the photo.
Just read what I have posted few days ago in this thread. It has nothing to do with backfire. Your airbox pulls the throttle body out. Don't think for now. Just do what I say. Something at the front of your airbox pushes it toward the rear end. either the coolant air breather, or a cable cluster that was inappropriately routed.

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Old 07-02-2012, 07:44 AM   #4277
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Quote:
Originally Posted by Gros Buck View Post
Just read what I have posted few days ago in this thread. It has nothing to do with backfire. Your airbox pulls the throttle body out. Don't think for now. Just do what I say. Something at the front of your airbox pushes it toward the rear end. either the coolant air breather, or a cable cluster that was inappropriately routed.

Paul Jr 8
thanks for the suggestion :) but it's not my case, i've heard the explosion from the air box (and the engine stalled), is a backfire
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Old 07-02-2012, 08:08 AM   #4278
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[QUOTE=Night Crawler;18908830]My bike has never even missed a beat, and always starts on first crank until this weekend. I went to start it mid-way through a ride when the bike was hot and it just cranked over continuously but would not start until I cranked the throttle wide open and bam it fired right up. It ran perfectly until I got back and would not start again. I have been able to start it the same way since, but it is very difficult. After it starts, its seems to run fine. I can hear pump coming on normally, and I changed the spark plug and cleaned the air filter. I have found no loose connections, only what looks to be a missing ground on the left side of the frame right below the air box bushing mount, but I can not find a wire that would go there. Is this an extra grounding point or was something going there that I cant find? Thank you for any help.

Quote:
Originally Posted by bobzilla View Post
TPS adjustment probably. How does it idle? Did you try just a tiny throtttle opening to start?
I am pretty sure that is just another grounding point. Both sides have one if I remember right
Had this issue come up again. This time threw the error code for the rollover sensor, so I tipped the bike over on its side and it started right up. Is there a way to eliminate this sensor instead of just replacing it? I am a big fan of getting rid of possible sources of failure.
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Old 07-02-2012, 10:29 AM   #4279
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Originally Posted by night crawler View Post
i am a big fan of getting rid of possible sources of failure.
+1
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Old 07-02-2012, 11:13 AM   #4280
Mini Trail
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My bike is smoking, burning oil I can't figure out why. It was running normal two weeks ago when I put it away, I even watched someone else ride it so I am sure it wasn't doing this. I went to put it on the trailer last Friday and it was billowing white smoke with the throttle open. I put it back and took another bike.

Today I fired it again and it is still smoking. I thought it might have too much oil so I drained it and checked the screens. I don't have new filters but these probably have less than 1500 miles on them. Still smoking a lot. I drained some of the oil out, still smoking. I pulled the air filter and there doesn't seem to be any oil in the air box.

I don't know why it would just start doing this. It has smoked before but I think it was over-filled and would stop pretty quickly.

So what are my possibilites? Sucking oil into the top end? Burned valve? Broken ring?

I finally got into the bike this weekend. The head is fine, the cylinder is fine, the Nikasil is beatuful, The piston is sloppy loose and the rings have about 1/8" gap. I have no ideas. Fewer than 7000 miles.
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Old 07-02-2012, 11:25 AM   #4281
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How do I know if I have Cylinder size 1 or Cylinder size 2? I have measured it with three sets of calipers and it is ever so slightly under the minimum for both but would come closest to size 1.

The cylinder says 102/10P on the side for what it's worth.
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Old 07-02-2012, 11:56 AM   #4282
wswartzwel
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Which air filter were you using? also check the PCV hoses where they attach on the RH side of the frame next to the air box.. One of mine came loose and was venting to the atmosphere.. I caught it before it sucked any dirt into the engine.
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Old 07-02-2012, 12:15 PM   #4283
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Originally Posted by Mini Trail View Post
I finally got into the bike this weekend. The head is fine, the cylinder is fine, the Nikasil is beatuful, The piston is sloppy loose and the rings have about 1/8" gap. I have no ideas. Fewer than 7000 miles.
Mine is smelly and drinks oil like no tomorro, no smoke tho.

Last 1000 km ~ 5 dl 10/60 :(
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Old 07-02-2012, 12:18 PM   #4284
Mini Trail
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Originally Posted by wswartzwel View Post
Which air filter were you using? also check the PCV hoses where they attach on the RH side of the frame next to the air box.. One of mine came loose and was venting to the atmosphere.. I caught it before it sucked any dirt into the engine.
Stock paper with grease around the edges. I have seen very light traces of dust in the box before (which I heard was common) but nothiing I would think would accelerate wear like this. There are no traces of abrasives in the throttle body, head or connections.
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Old 07-02-2012, 01:00 PM   #4285
Seth S
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Originally Posted by wino975 View Post
thanks for the suggestion :) but it's not my case, i've heard the explosion from the air box (and the engine stalled), is a backfire
Interesting. I'd be more interested in solving the backfire issue than harnessing the TB. I have not had a single backfire on my bike in 8000 miles of hard riding...at least nothing that popped the throttle body off.
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Old 07-02-2012, 01:13 PM   #4286
SKINNY
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Originally Posted by Seth S View Post
Interesting. I'd be more interested in solving the backfire issue than harnessing the TB. I have not had a single backfire on my bike in 8000 miles of hard riding...at least nothing that popped the throttle body off.
It appears that the 2012 models (at least some) have a warm start issue. Mine acts like it isn't going to start if not given a slight amount of throttle....the wrong amount results in a serious backfire on occasion which usually blows the throttle body nearly off the intake stub. My 2008 model has never started any differently hot or cold...no throttle.. maybe 1 or 2 very short bumps on the start button and it cranks right up. The 2012 will eventually start when warm with no throttle, but it takes several long (3-5 second) cranks with the starter. As usual, KTM NA has no clue according to my dealer and actually blamed it on my FMF slip-on in spite of the fact that they were told it had the same issue with the stock muffler.
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Old 07-02-2012, 01:51 PM   #4287
wswartzwel
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Location: Central Arkansas
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Quote:
Originally Posted by Mini Trail View Post
Stock paper with grease around the edges. I have seen very light traces of dust in the box before (which I heard was common) but nothiing I would think would accelerate wear like this. There are no traces of abrasives in the throttle body, head or connections.

Dust in the airbox is not good. After correcting the wear issue, be sure to change to a different air filter. Flush the crankcase well, because that dirt is still in the bottom end.
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Old 07-02-2012, 04:17 PM   #4288
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Quote:
Originally Posted by SKINNY View Post
It appears that the 2012 models (at least some) have a warm start issue. Mine acts like it isn't going to start if not given a slight amount of throttle....the wrong amount results in a serious backfire on occasion which usually blows the throttle body nearly off the intake stub. My 2008 model has never started any differently hot or cold...no throttle.. maybe 1 or 2 very short bumps on the start button and it cranks right up. The 2012 will eventually start when warm with no throttle, but it takes several long (3-5 second) cranks with the starter. As usual, KTM NA has no clue according to my dealer and actually blamed it on my FMF slip-on in spite of the fact that they were told it had the same issue with the stock muffler.
Yes mine is like that too feels like it needs one of those hotstart levers like my crf 450x has
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Old 07-02-2012, 04:49 PM   #4289
Gros Buck
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Location: Quebec City, Canada
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Quote:
Originally Posted by Seth S View Post
Interesting. I'd be more interested in solving the backfire issue than harnessing the TB. I have not had a single backfire on my bike in 8000 miles of hard riding...at least nothing that popped the throttle body off.
Mine does once in a while, but I suspect it's because sometimes I start the bike before the starting cycle is completed ...

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Old 07-02-2012, 06:12 PM   #4290
CanadianX
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Quote:
Originally Posted by Seth S View Post
Interesting. I'd be more interested in solving the backfire issue than harnessing the TB. I have not had a single backfire on my bike in 8000 miles of hard riding...at least nothing that popped the throttle body off.
Had my first backfire last week. Possibly related to a code the bike threw, maybe not, but I was riding to work and the bike threw a code, 1x long 4x short, manual says ambient air pressure sensor. Later that day riding in stop and go traffic and running hot I blip the throttle to get ready to roll forward another 10 feet and "pop" bike stalls. I restart and eventually get home. Later my friend notices that the TB has backed away, not off but loose. Pushed it back on and retighten the clamp. No more code by the way, not sure when it stopped but I haven't had it come back since the backfire.

I added a FMF pipe Friday and got out for a run today. While out riding "pop" off comes the TB. Reattach and later "pop" again. Figure the bike is running to lean so install the 2012 Akro map. Seems to be working fine now but I haven't logged any off road miles yet to induce a stall or similar conditions to pop the TB. I'll report back in a few days as I suspect a lean condition cause a back fire and the akro map helps richen it up a bit.

Next, although the tune seems to give the bike more snap it still has a flat spots between 4 and 5000 rpm, particularly in 5th and 6th gear. When I roll on the throttle it seems to hesitate or bog a bit then comes alive at 5000km Tune issue or something else? Anyone notice similar on their 2012? My friends 2011, FMF, foam filter and tune pulls noticeably better. Not a significant difference but it is noticeable. Thoughts?
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