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Tulsa Sportbike Riders • View topic - carb questions- '87 GSX-R750

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 Post subject: carb questions- '87 GSX-R750
PostPosted: Mon Mar 30, 2009 4:06 pm 
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Joined: Mon Mar 30, 2009 3:53 pm
Posts: 1
I Ride: 1987 GSX-R750
Hey All,
So I'm doing some work on a carb for an old bike I just bought, and it seems like there are a lot of open ports hanging around. Not sure if these were supposed to be capped off or go somewhere and haven't been able to find detailed pics anywhere else.

From the rear, the yellow port was the fuel line, but I have no idea what the red or blue circled ones are.
Attachment:
rear- color shrink.JPG
rear- color shrink.JPG [ 78.6 KiB | Viewed 2866 times ]


From the front, the green circled port ran to the back of the petcock (vacuum line?). I'm assuming the four ports with the caps are the sync ports?
Attachment:
front-color shrink.JPG
front-color shrink.JPG [ 91.56 KiB | Viewed 2862 times ]


Anyway, any info on this would be great.
Thanks!


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 Post subject: Re: carb questions- '87 GSX-R750
PostPosted: Mon Mar 30, 2009 5:01 pm 
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Joined: Thu Feb 05, 2004 12:58 pm
Posts: 5622
Location: Tulsa
I Ride: '07 YZ250F
The red ones just open to the atmosphere. You don't need hoses on them, but they might get water in them if you don't. The hoses should just run upwards under the tank or seat.
I think the blue is vacuum for the petcock (no fuel should flow when the enine is off unless you turn the petcock to "PRIME").
The four capped are for syncing.
Don't know about the green one.
Maybe this will help:

http://www.mrcycles.com/fiche_section_detail.asp?section=97995&category=Motorcycles&make=Suzuki&year=1987&fveh=2184

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 Post subject: Re: carb questions- '87 GSX-R750
PostPosted: Tue Mar 31, 2009 8:46 am 
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Joined: Sun Jun 11, 2006 11:54 am
Posts: 6462
Location: Northwoods, WI
I Ride: KTM
I would think the green one should be overflow.

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 Post subject: Re: carb questions- '87 GSX-R750
PostPosted: Tue Mar 31, 2009 12:13 pm 
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Location: Tulsa
I Ride: american bikes
nyteshades wrote:
I would think the green one should be overflow.


I'm pretty sure the red ones are the overflows. Notice the rubber connecting carb one and two, then the red one, and rubber connecting carb three and four, then another red on. The green one appears to go into the air stream of number four carb on the engine side, so, I'm thinking its a vacuum of some sorts.

Here's a thought, my 86 Suzuki GS actually had a vacuum canister on the rear fender behind the sissy bar. It caught vapors from the fuel tank(as opposed to being vented to the atmosphere) and pulled them thru the engine. Some crappy 80's environmental shit.

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 Post subject: Re: carb questions- '87 GSX-R750
PostPosted: Tue Mar 31, 2009 2:36 pm 
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Joined: Sun Jun 11, 2006 11:54 am
Posts: 6462
Location: Northwoods, WI
I Ride: KTM
The red ones are to high too be the overflows, they are over the butterflies and slides. For the overflow to be effective it would need to be lower than the butterflies/slides and a little above the float. There's just no way for fuel to reach the red ones.

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Last edited by nyteshades on Tue Mar 31, 2009 9:41 pm, edited 1 time in total.

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 Post subject: Re: carb questions- '87 GSX-R750
PostPosted: Tue Mar 31, 2009 3:59 pm 
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Joined: Tue Apr 15, 2008 9:28 pm
Posts: 4811
Location: Tulsa
I Ride: american bikes
Mine has this on the back?

http://alpha-sports.com/suzuki_parts.htm

The link didn't bring up what I wanted, but here it is.


Attachments:
EPA.jpg
EPA.jpg [ 46.76 KiB | Viewed 2749 times ]

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