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wheelzz |
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wheelzz L Plate Warrior
Joined: 19 Sep 2015 Karma :
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Posted: 03:11 - 19 Sep 2015 Post subject: 1980 GS550 from the dead |
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Hello, I am new to this forum and wanted to post a couple of questions to see if I could get some knowledge about my recent purchase. I bought a 1980 Suzuki GS550 and a 1981 GS650.
The GS550 is very close to running while the GS650 is more of a parts bike and would need a lot of work to get running. When I purchased the bike the seller said he was tired of working on carburetors and wanted to get rid of them.
Everything on the bike works, aside from the charging system and the carburetors. New chain, front tire, clutch cable, and a bunch of cleaning to the carbs. The charging system I suspect the stator as I've heard these go bad. The carbs are their own story.
After completely taking the carbs apart, carb dipping, blowing all the passage ways out, fitting new orings in all the critical areas, choke, fuel lines, and fuel/air screw, and reassmbling I am able to start the bike and with a little finesse on the choke, can get it to idle. The problem I am having is that the bike dies as soon as I push the choke back in. When starting hot, choke fully pulled, the bike will start and rev high and stay at about 3 rpm. Finesse brings it back to idle but wont idle on its own. So i figure it needs fuel at idle and I test by turning each carb fuel needle out a half turn at a time all the to about 4 turns out and starts to help. I know 4 turns is too much so I figure it must be my jet sizes. The guy before me "worked on" the carbs. What this consists of I did not think to ask at the time. These are Mikuni BS32SS carbs with jet sizes as follows
Main Jet 110
Pilot Jet 42.5
Needle Jet x-5
Air Jet 160
My questions are about jet sizes, which jets to adjust for idle, and where to buy. Does bigger the jet size mean more flow or less? Do I need more fuel flow at idle? What jets do I change? Or are the jets even my problem?
I apologize if this was posted somewhere else but my search of "GS550 choke" came up with nothing.
Thanks and intelligent input is much appreciated
wheelzz |
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Snod Blatter |
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Snod Blatter Crazy Courier
Joined: 21 Nov 2014 Karma :
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Posted: 10:17 - 19 Sep 2015 Post subject: |
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Idling seems to be a problem, a little help here and here although they both seem to boil down to "clean them some more".
Did you check the float levels? Are the jet sizes correct? Do you have a manual to hand to check these things? Are all the diaphragms okay? ____________________ 1994 CB250, 1984 CBX250RS-E, 1989 K100RS, 1995 TRX850, 2016 Z250SL |
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A100man |
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A100man World Chat Champion
Joined: 19 Aug 2013 Karma :
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Posted: 19:48 - 19 Sep 2015 Post subject: |
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Are they in fact the right carbs ? My XJ550 of the same era has BS28s only the later are rather more powerful XJ600 used BS32s and then with smaller jets than you have! (Mains 105 pilot 40). Lot of dedicated GS forums out there to help..
https://www.thegsresources.com/_forum/index.php ____________________ Now: A100, GT250A, XJ598, FZ750
Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600 |
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wheelzz |
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wheelzz L Plate Warrior
Joined: 19 Sep 2015 Karma :
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A100man |
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A100man World Chat Champion
Joined: 19 Aug 2013 Karma :
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Casper |
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Casper World Chat Champion
Joined: 12 Jul 2010 Karma :
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Old Thread Alert!
The last post was made 8 years, 244 days ago. Instead of replying here, would creating a new thread be more useful? |
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