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Old 05-10-2012, 07:07 AM   #1
CDN_bacon
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uh oh... no air filter

Some how I inadvertently forgot to put my air filter back in the morning before my hare scramble last weekend. The terrain was a mix of woods and open runs in deep sand (Skull Creek)and there were several crashes in each along the the normal driving in a dust cloud behind the group.

No on how or why please. Please note when I opened the air box and discovered it was missing the filter the box seemed surprisingly clean however I didn't check for film dust ...

My question is what if any dmg is done to my bike? What should I do or check before my next run on the bike?
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Old 05-10-2012, 07:20 AM   #2
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Nothing you can do about it now.. it already happened.......

clean out the air box and look at the opening on the carb to see if any dirt (sand ) etc is in there.... if the carb is dirty clean it... clean out the airbox, and put the air filter in....

I have my rear suspension torn down at the moment, sand everywhere... to lube the swing arm, shock and linkage... my air filter was not that dirty this time out....

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Old 05-10-2012, 07:25 AM   #3
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that sucks! exactly like ltw9r said
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Old 05-10-2012, 10:35 AM   #4
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it wasn't that dusty at all that day, at least not where i was riding anyway, you'll more than likely be ok but as Tommie said, make sure you at least inspect the carb for foreign debris and clean if there is any... i rarely clean my filter anyway, so i'm sure mine is worse off than yours
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Old 05-10-2012, 10:44 AM   #5
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well change the oil and forget about it.

I went to check our 4 wheeler air filter a few weeks ago and it had fallen apart and basically wasnt there, not sure how long it had been like that but weeks before it we went to the offroad park and rode for hrs in dirt and dust behind other 4 wheelers. I changed the oil and filter this weekend.
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Old 05-10-2012, 11:08 AM   #6
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Irak, no more drinking for you while doing bike maintenance.
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Old 05-10-2012, 11:15 AM   #7
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Quote:
Originally Posted by 1FC View Post
well change the oil and forget about it.

I went to check our 4 wheeler air filter a few weeks ago and it had fallen apart and basically wasnt there, not sure how long it had been like that but weeks before it we went to the offroad park and rode for hrs in dirt and dust behind other 4 wheelers. I changed the oil and filter this weekend.
why change his oil? that has no bearing on running with no air filter
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Old 05-10-2012, 11:25 AM   #8
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Probably because if he forgot to put his filter back in, no telling how long it's been since the oil was changed.
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Old 05-10-2012, 11:48 AM   #9
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I would think the oil could possibly have grit or grim in it.
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Old 05-10-2012, 12:04 PM   #10
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Like I said in the text to you last night...I would think this is crucial. Now what you, a mechanic, or myself would suggest and do might all differ. I am overly conservative which would also mean I would spend more time or money than most on it. You might not like to hear that I would suggest tearing apart a well running motor...but that's what I do on my spare time and a reason why I probably have my own bouts with mechanical issues.

These 4 strokes move a lot of air through the engine.I'd be concerned about your valves. The first thing I would do is check your clearances. Compare them to your last adjustment. Sand would eat away at the valve faces and seats. I'd also check them after every future ride and make sure they aren't moving towards ZERO. I'd also change the oil, because some dirt/sand that made its way into the cylinder could find its way into the crankcase, but also because you just raced it and fresh oil never hurts the bike, only the wallet. I would also go to cleaning the carb. Personally, I would also pull the head to inspect it and check the cylinder/piston for wear. Sand between the piston ring and the nicasil plating on the cylinder would do some damage if it found its way there.

What's done is done. You might have gotten off easy or you might have just reduced your bike's engine life. By how much? Who knows. You could slap the filter on and go from there and the bike might see a 100 more hours. Or you could slap the filter on, go for a ride, and end up pushing your bike back to the truck because the top end fell apart and killed your crank. The possibilities are endless. I hope I'm not just creating more fear.
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Old 05-10-2012, 12:25 PM   #11
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A friend gave me a john deere tractor they ran without an air cleaner for 2 summers mowing fields, that thing smoked liked crazy but ran great , I finally gave it away, it was a little hard to start sometimes Im guessing the low compression was to blame.
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Old 05-10-2012, 12:29 PM   #12
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Quote:
Originally Posted by jbird710 View Post
Probably because if he forgot to put his filter back in, no telling how long it's been since the oil was changed.
FYI, I changed the oil and filter about 4 hours before the race :P
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Old 05-12-2012, 11:41 PM   #13
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I pulled the airbox off today... no sand particles but some light dust on a couple spots, hardly anything at all. Looking down in the carb opening there was nothing. Top of the gate (right term?) was a bit dark with some grime but not sand. I'm finally found a camshaft which I'm going to swap out this week so I'll check my valve clearances at the same time.

I just can't bring myself to pull the carb off to pull it apart. Its a f'n pain to get it off the bike and seeing what I see (or lack there of) I think (and hope) its good.


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Old 05-13-2012, 07:22 AM   #14
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Like I said in my response to your pm. Wipe it off and go ride it. It's highly unlikely you've done any significant damage.
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Old 05-13-2012, 12:00 PM   #15
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Quote:
Originally Posted by CDN_bacon View Post
FYI, I changed the oil and filter about 4 hours before the race :P
Just a little good natured ribbin'. Believe me, I've done the same same thing and worse. Back in the late '80s when I raced MX, I used to have a reoccurring dream where I dumped the crankcase oil, replaced the drain plug, and forgot to put in fresh oil before a race. In the dream, I'd be on the starting line, just before the gate falls, when I would remember and then wake up wondering why I kept having that dream. Good thing about it is, I never forgot to refill the crankcase.

As you said, you're probably OK and, yes, I know what a pain it is to get carbs off of 4 strokes (yet another thing that still amazes me). Back in the 2 stroke days, most manufacturers made great efforts to make the bikes more serviceable so you could work on things between races/motos and have plenty of time. Now, you have to pull the gas tank to change a spark plug? Truly, design fail at best!
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