Mystery Nipple!

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UI Vandal
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Mystery Nipple!

Post by UI Vandal »

While refreshing the top end of my bike I discovered a mystery nipple. It had no hose attached and was a bit gunked up.
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Should a hose from the carb attach ere? Should there be an additional hose attached?
My KIPS area is also missing these two bolts.
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What function do they serve?
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JoKDX220r
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Mystery Nipple!

Post by JoKDX220r »

The "nipple" is used to plug the case breather hose...
The 2 bolts, if you mean the ones with the number "7" on them are used as stoppers if I remember correctly..
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Tedh98
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Mystery Nipple!

Post by Tedh98 »

JoKDX220r wrote:The "nipple" is used to plug the case breather hose...
That hose should then go up to and inside the airbox.
UI Vandal
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Mystery Nipple!

Post by UI Vandal »

Tedh98 wrote:
JoKDX220r wrote:The "nipple" is used to plug the case breather hose...
That hose should then go up to and inside the airbox.
Thank you! Guess I'll grab some fuel line hose then.
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Slick_Nick
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Mystery Nipple!

Post by Slick_Nick »

The breather hose doesn't go inside the air box, it goes into the little "hoop" on the bottom of the air box by the frame rail.
'00 KDX 220R
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Tedh98
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Mystery Nipple!

Post by Tedh98 »

Slick_Nick wrote:The breather hose doesn't go inside the air box, it goes into the little "hoop" on the bottom of the air box by the frame rail.
Interesting. That wasn't how it was set-up on the '97 and '01 200's I had.
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diymirage
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Re: Mystery Nipple!

Post by diymirage »

i've heard of people running that breather hose as well as all the carb vent hoses into the airbox in order to cross deeper waters

on both my bikes this breather hose was run down the engine and tuck in by the rear shock just like the carb hoses
newbbewb wrote:DIYmirage has it right.


-1996 KDX 200 woods weapon (converted to 99 green body)
-1996 KDX 200 plated street toy (barney edition)
-2003 Yamaha TTR125-L (wifeys bike)
-1997 KDX 220 project bike
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Re: Mystery Nipple!

Post by KDXGarage »

In stock form, there is a hole in the airbox of a few KDX's to place the crankcase breather tube.
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rbates9
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Mystery Nipple!

Post by rbates9 »

Mine has the breather going up to the air box.
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Mystery Nipple!

Post by Slick_Nick »

Tedh98 wrote:
Slick_Nick wrote:The breather hose doesn't go inside the air box, it goes into the little "hoop" on the bottom of the air box by the frame rail.
Interesting. That wasn't how it was set-up on the '97 and '01 200's I had.
According to the factory "hose and wire routing diagram" that's where its supposed to go, into that hoop on the bottom of the airbox.
'00 KDX 220R
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Mystery Nipple!

Post by KDXGarage »

On page 1-22 of the 1997 manual, I am seeing it with an arrow, mentioning "to the airbox".

The hole in the airbox is for the crankcase vent hose.
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Re: Mystery Nipple!

Post by Kroynon »

On the 91-94 250s it also goes into the airbox. I had it there until I bailed on a brutal hill climb and the bike was upsidedown on the face of the hill for a while as I climbed back up to retrieve it. By the time I got there most of the case oil had poured out the breather into the air box.
Now I route the hose up the frame and back down under the engine with the carb vents in a loop to avoid this from happening again.
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rbates9
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Mystery Nipple!

Post by rbates9 »

Jason wrote:On page 1-22 of the 1997 manual, I am seeing it with an arrow, mentioning "to the airbox".

The hole in the airbox is for the crankcase vent hose.
My bike was stock when I got it and it went to the air box, and the best I can recall the 95 I had years ago also went to the air box. I can't see why they would have it vent to the ground. If it was in the wide open air then it would suck in crap too much.
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Re: Mystery Nipple!

Post by KDXGarage »

Kroynon wrote:On the 91-94 250s it also goes into the airbox. I had it there until I bailed on a brutal hill climb and the bike was upsidedown on the face of the hill for a while as I climbed back up to retrieve it. By the time I got there most of the case oil had poured out the breather into the air box.
Now I route the hose up the frame and back down under the engine with the carb vents in a loop to avoid this from happening again.
Have you considered not looping it out and leaving it upside down as a way "to avoid this from happening again"?? :grin:
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Re: Mystery Nipple!

Post by Kroynon »

Jason wrote:
Kroynon wrote:On the 91-94 250s it also goes into the airbox. I had it there until I bailed on a brutal hill climb and the bike was upsidedown on the face of the hill for a while as I climbed back up to retrieve it. By the time I got there most of the case oil had poured out the breather into the air box.
Now I route the hose up the frame and back down under the engine with the carb vents in a loop to avoid this from happening again.
Have you considered not looping it out and leaving it upside down as a way "to avoid this from happening again"?? :grin:
Haha... That would be too easy but may be worth a try. :lol:
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