Best Carburetor option for 1986 GSXR750? - Suzuki GSX-R Motorcycle Forums Gixxer.com
 
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post #1 of 19 (permalink) Old 03-28-2009, 12:50 AM Thread Starter
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Best Carburetor option for 1986 GSXR750?

So I just got started in my first GSXR project, a 1986 GSXR750. Well the bike runs ok and needs mostly cosmetic/hardware items. But the beast did have a slight trickle of fuel out of the carbs...............so I tore down the carbs today to find a most unexpected culprit...One of the float perches (actual cast aluminum part of carb body that float pin sits within) cracked off???WTF?
So here is my question, what would my best option be to replace these? I could just get another set of 1986 Carbs off ebay, but I was curious if there were newer carbs that may be an upgrade? The bike is mostly stock except for a Yoshi pipe and pod filters. Comparing what the Clymer manual calls for as stock jets with those in the ruined carbs leads me to believe this had a stage-3 kit installed.
Any help is much appreciated.
-Fissel
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post #2 of 19 (permalink) Old 03-28-2009, 12:54 AM
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Re: Best Carburetor option for 1986 GSXR750?

What mm carbs came stock on an '86 750? If I were you I would just pick up a set of 36mm CV carbs off of a member here and if none are up for grabs then look at ebay.

*edit* oh you have to first get your red R, so that you can see the oil cooled classifieds. Lifetime membership is $40 and the best $40 you'll spend towards fixing up your bike
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post #3 of 19 (permalink) Old 03-28-2009, 01:54 AM
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Re: Best Carburetor option for 1986 GSXR750?

If I were in your shoes (and I am) I would look for a set of second gen 750 slingshots, or mid 90's katana cv's. I have a set of 36mm's from an 89 and a set of 38mm's from a 92. These are to be used on later model 750 engines that I have. For my 86 engine I have a set of 33mm carbs from a mid 90's Katana 600. I was looking for 34mm carbs, but they are only available in the older style 1100 carbs. I chose to stay away from them due to the slide/diaphragm design...they have a permanently attached diaphragm that requires replacement of the whole slide if the diaphragm goes bad (which they do more often than not). Stay away from the 86 750 carbs...they are just plain too small at 31mm, and chances are the diaphragms are starting to dry rot. I personally don't think an 86 750 engine in stock trim needs 36's or 38's, but a lot of people run them. They would probably be great for top end, but I hope to retain some more midrange with the 33's. This is just my $.02's worth as far as size goes, but I assure you, stay away from the older style with the permanently attached diaphragm...they only lead to heartache and more expense in the long run.
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post #4 of 19 (permalink) Old 03-28-2009, 02:08 AM
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Re: Best Carburetor option for 1986 GSXR750?

If you want to stay away from the 36's like 2k suggested would 34mm Kat 1100 CV's work for ya? That's what was on my '90 1127 Kat motor when I got it.
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post #5 of 19 (permalink) Old 03-28-2009, 08:20 AM Thread Starter
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Re: Best Carburetor option for 1986 GSXR750?

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Originally Posted by koolaid5 View Post
If you want to stay away from the 36's like 2k suggested would 34mm Kat 1100 CV's work for ya? That's what was on my '90 1127 Kat motor when I got it.
Are you offering to sell me the 34mm CV's? That does sound like a good option. What jetting do you guys think would be comparable to the stock carbs with a stage 3 kit? If anyone in oil-cooled Gixxer land has a nice set of 34s I am interested. But be warned I don't have the budget of a brain surgeon.
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post #6 of 19 (permalink) Old 03-28-2009, 11:22 AM
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Re: Best Carburetor option for 1986 GSXR750?

Ah crap.... sorry if that's the way it sounded Fissel. I already sold them to another member for like $70 bucks shipped. You need to get that red R and then post a WTB thread in the oil cooled classifieds. I'll keep my eye out for some for you though.
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post #7 of 19 (permalink) Old 03-28-2009, 09:41 PM Thread Starter
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Re: Best Carburetor option for 1986 GSXR750?

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Ah crap.... sorry if that's the way it sounded Fissel. I already sold them to another member for like $70 bucks shipped. You need to get that red R and then post a WTB thread in the oil cooled classifieds. I'll keep my eye out for some for you though.
No apology necessary. Just wishful thinking. If nothing else pops up I just noticed a totally stock set on ebay that closes in a few days so I may just get them (provided they stay cheap) since I already know & have the jet situation sorted out. But between now and then I'll keep my eyes peeled for some 34s.
-Fissel
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post #8 of 19 (permalink) Old 03-28-2009, 09:52 PM
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Re: Best Carburetor option for 1986 GSXR750?

I'll look some more for you too. I emailed a few people from craigslist for you today, but no luck so far. I found a big honkin set of flatsides though The only 34 cv's I've seen have been between $100-$360 I'll keep at it. good luck
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post #9 of 19 (permalink) Old 03-29-2009, 04:18 AM
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Re: Best Carburetor option for 1986 GSXR750?

keinhin CR33 is also a great option for a slabbie
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post #10 of 19 (permalink) Old 03-29-2009, 10:26 AM
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Re: Best Carburetor option for 1986 GSXR750?

The float pin mount can be repaired with JB weld, some on this site have done so. Do a search and you'll find some pics.
If you go for 33s or 34s you'll probably need bigger boots as well.
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post #11 of 19 (permalink) Old 03-29-2009, 11:32 AM
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Re: Best Carburetor option for 1986 GSXR750?

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Originally Posted by GertRam View Post
The float pin mount can be repaired with JB weld, some on this site have done so. Do a search and you'll find some pics.
If you go for 33s or 34s you'll probably need bigger boots as well.
No boots needed...I have had 36's in my stock boots. They're a tight fit but will go in.
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post #12 of 19 (permalink) Old 03-29-2009, 09:29 PM Thread Starter
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Re: Best Carburetor option for 1986 GSXR750?

Thanks for all the info.
Though I appreciate the suggestion & agree JB Weld is great for many things; I don't think I want it in my carburetors.
CR's look really nice, but wicked expensive. I only found a set on one site and they were $987 for a set of four? Anyone know where I can get them a little (lot) cheaper. I am not a cheapo and don't mind spending a couple of hundred for a really top notch upgrade, but I cannot justify a grand.
Thanks again, especially to Mr. KoolAid.
-Fissel
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post #13 of 19 (permalink) Old 03-29-2009, 11:01 PM
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Re: Best Carburetor option for 1986 GSXR750?

Does anyone know what size carbs come on the '99 Katana 600 and if they'll work for Mr. Fissel? I found a set for ya for $100 + shipping, but still keeping my eyes peeled for something cheaper.
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post #14 of 19 (permalink) Old 03-30-2009, 01:36 AM
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Re: Best Carburetor option for 1986 GSXR750?

Quote:
Originally Posted by koolaid5 View Post
Does anyone know what size carbs come on the '99 Katana 600 and if they'll work for Mr. Fissel? I found a set for ya for $100 + shipping, but still keeping my eyes peeled for something cheaper.
The carb sticky says 1990 on the GSXF Katana 600 uses BST33SSs, but the jetting and needles will probably need attention as bore and stroke are way different. I believe Fruitloops tried this set up and had some difficulties.
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post #15 of 19 (permalink) Old 03-30-2009, 01:51 AM
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Re: Best Carburetor option for 1986 GSXR750?

u can get the posts repaired properly - i.e. rewelded - at one of the carb places. don't know wot it costs tho', thinking about $100 or $150 from memory.
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post #16 of 19 (permalink) Old 03-30-2009, 01:52 AM
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Re: Best Carburetor option for 1986 GSXR750?

$100-$150 you can get a whole new set of carbs though
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post #17 of 19 (permalink) Old 03-30-2009, 02:00 AM
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Re: Best Carburetor option for 1986 GSXR750?

here u go http://www.motorcyclecarbs.com/_W327.cfm
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post #18 of 19 (permalink) Old 03-30-2009, 02:02 AM
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Re: Best Carburetor option for 1986 GSXR750?

yeah i'm just letting him know all his options - looks like it's cheaper than i thought anyway.
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post #19 of 19 (permalink) Old 03-30-2009, 09:10 AM Thread Starter
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Re: Best Carburetor option for 1986 GSXR750?

Interesting............whether or not I repair these, knowing a place that can repair such an issue is good to know. Thanks Mark E.
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