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Anyone have any idea what this is? [Part of a carb]

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Lipsmoker
Trackday Trickster



Joined: 22 May 2010
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PostPosted: 16:40 - 14 Aug 2011    Post subject: Anyone have any idea what this is? [Part of a carb] Reply with quote
Stripped the carb down today and blocked up the SAI air intake on the manifold

Also came across this on the carb.. It's sucking when the engine is running and has baffled me and my dad Rolling Eyes

https://a5.sphotos.ak.fbcdn.net/hphotos-ak-ash4/291770_2020809478255_1184473155_31946179_2348562_n.jpg

The black thing top right of the air inlet
any ideas?

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It's a MIKUNI 28mm Carb.
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yen_powell
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Joined: 22 Jun 2008
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PostPosted: 16:42 - 14 Aug 2011    Post subject: Reply with quote
Well it looks like the vacuum fitment for a Scottoiler to me, never seen one fitted there before though?
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carvell
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Joined: 05 Sep 2003
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PostPosted: 16:45 - 14 Aug 2011    Post subject: Reply with quote
Looks like the air vent to me.

I think they usually connect into the airbox where they sometimes have their own little filter.
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Lipsmoker
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Joined: 22 May 2010
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PostPosted: 16:47 - 14 Aug 2011    Post subject: Reply with quote
yen_powell wrote:
Well it looks like the vacuum fitment for a Scottoiler to me, never seen one fitted there before though?


Thanks for the input.. could be a few things in my book


Scottoiler fitment
Taking warm air back in through the carb out a crankcase breather
Something to do with the SAI [Secondary air injection] as this is off a Chinese bike.
or linking back to the airbox
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Mikey CB500
Scooby Slapper



Joined: 06 Aug 2011
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PostPosted: 16:56 - 14 Aug 2011    Post subject: Reply with quote
As its a chinese bike its possibly the inlet for the air circulation crap that they put on the exhausts to cut power and limit emmisions
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cb1rocket
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Joined: 30 Jan 2010
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PostPosted: 16:59 - 14 Aug 2011    Post subject: Reply with quote
its not the vaccumm connection to the vacuum operated fuel tank tap?
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Lipsmoker
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Joined: 22 May 2010
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PostPosted: 17:11 - 14 Aug 2011    Post subject: Reply with quote
cb1rocket wrote:
its not the vaccumm connection to the vacuum operated fuel tank tap?


Nope it's a gravity operated tap
but thanks
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jjdugen
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Joined: 03 Jun 2011
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PostPosted: 17:12 - 14 Aug 2011    Post subject: Reply with quote
If its sucking air, block it with your finger or a suitable plug. If the engine tickover speed increases, leave it permantly blocked as it will cause a weak mixture. (Just as long as it isn't the vacuum fuel tap connection, then you will have no fuel flow).
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Pete.
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Joined: 22 Aug 2006
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PostPosted: 17:27 - 14 Aug 2011    Post subject: Reply with quote
Was thinking it looks like a vent but if it's sucking it's probably just to power the emissions valve.
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Last edited by Pete. on 17:28 - 14 Aug 2011; edited 1 time in total
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Lipsmoker
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Joined: 22 May 2010
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PostPosted: 17:27 - 14 Aug 2011    Post subject: Reply with quote
jjdugen wrote:
If its sucking air, block it with your finger or a suitable plug. If the engine tickover speed increases, leave it permantly blocked as it will cause a weak mixture. (Just as long as it isn't the vacuum fuel tap connection, then you will have no fuel flow).


Engine speed increases alot.. it raises to somewhat 4000 rpm from a 1200 idle it's a gravity fuel tap so it's all good

thanks
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Lipsmoker
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PostPosted: 18:04 - 15 Aug 2011    Post subject: Reply with quote
I blocked this off and the float bowl started leaking fuel out the sides and the bike kept cutting out

Anti stall?

Non the less the bikes running fine now with it left open
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