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suzuki gs850 mikuni cv carbs 16 May 2015 12:27 #672381

  • 76KZ900
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I posted this in another section but I have more questions. I know it's a 82 suzukiGS 850 but I'm working on it for a friend. The carbs look identical to my 83 KZ1100 carbs. Problem began with bike literally took 25 min to warm up before you could ride it. So I figured good cleaning should fix problem. Also when bike was warm it would have a little bog to it before running good when cranking throttle. Cleaned entire carb. Soaked all jets in berrymans and blew out. Diaphrams look good no wear or tear. They actually look new. Bike starts and idles fine with very minor sputtering it back of carbs like every 20 seconds maybe. But when you try to give the throttle it bogs and stalls. It will start to rev once then nearly stalls... Recovers and you can't rev it any more. I will say putting choke on helps a little when revving. I'm guessing I don't have something right with diagrams. I noticed a small hole on bottom of slides. Book doesn't say where they should be oriented. Sorry for the long post about a bike that isn't relevant to this forum but figured since they appeared same as my 1100 I may run into this someday
78KZ400 (sold)
78KZ1000 (sold)
82KZ1100 (sold)
76KZ900 (sold) regret
03ZRX1200R (sold) regret
83KZ1100 LTD Shaft

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Last edit: by 76KZ900. Reason: poor spelling

suzuki gs850 mikuni cv carbs 16 May 2015 14:09 #672386

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I would also add that this problem started when I removed air box. Surely running NO air box wouldn't make it run this bad right?
78KZ400 (sold)
78KZ1000 (sold)
82KZ1100 (sold)
76KZ900 (sold) regret
03ZRX1200R (sold) regret
83KZ1100 LTD Shaft

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suzuki gs850 mikuni cv carbs 16 May 2015 15:19 #672393

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are they the BS38s? I was working on a friends '82 GS650 and it has those. what pods are you running? have you rejetted?

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Last edit: by DoctoRot.

suzuki gs850 mikuni cv carbs 16 May 2015 16:41 #672399

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No pods. Put stock airbox back on same result. I'm stumped. When he got bike a few weeks ago. Like I said it took about 20 min before you could ride it. I figured carbs needed cleaned. That's where it only got worse. Carbs were super clean on inside. Float bowls looked new. No rust in tank. Bike idles fine only thing that was done is hand screw on what the book says is timing chain tensioner. But I tightened right back up without turning motor over. So I really don't think that's an issue. When bike was first bought. It took a while for one or two pipes to get hot. After the 20 min warm up it was at least rideable. Which is not now
78KZ400 (sold)
78KZ1000 (sold)
82KZ1100 (sold)
76KZ900 (sold) regret
03ZRX1200R (sold) regret
83KZ1100 LTD Shaft

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suzuki gs850 mikuni cv carbs 16 May 2015 16:48 #672403

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No pods. Put stock airbox back on same result. I'm stumped. When he got bike a few weeks ago. Like I said it took about 20 min before you could ride it. I figured carbs needed cleaned. That's where it only got worse. Carbs were super clean on inside. Float bowls looked new. No rust in tank. Bike idles fine only thing that was done is hand screw on what the book says is timing chain tensioner. But I tightened right back up without turning motor over. So I really don't think that's an issue. When bike was first bought. It took a while for one or two pipes to get hot. After the 20 min warm up it was at least rideable. Which is not now. They are bs 32 mikuni according to the generic clymer manual I have that's for both 850 & 1100
78KZ400 (sold)
78KZ1000 (sold)
82KZ1100 (sold)
76KZ900 (sold) regret
03ZRX1200R (sold) regret
83KZ1100 LTD Shaft

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suzuki gs850 mikuni cv carbs 16 May 2015 20:55 #672446

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Sorry I meant BS32s, Got them confused with the BS38s on my 750 twin. Anyhow, if you have the airbox on there with stock pipes and stock jetting and the carbs are clean, i would check your timing advancer. If its rusty or stuck it wont advance properly and could be responsible for the loss of power as the revs climb. Also i would double check that the carbs are clean, sometimes they can look clean inside but the passageways can have blockage. Get some brake cleaner with a straw and shoot it down all the passage ways, block off ports to force it into all passages. The slides do need to be oriented in the carb body correctly. usually the diaphragm will have a tab on it that will show you how to align the slide.

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suzuki gs850 mikuni cv carbs 16 May 2015 21:03 #672447

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Yea I actually had half of slides oriented wrong. I swapped them. No difference. Put air box on tried again I admit a half hour worked ok. I blew out every passage for sure. Timing advancer was my next guess to then it started to work. I ran fur a while revved ok. Mains are 115. You don't suppose with stock pipes it was to lean do you ? Without air box on that is.
78KZ400 (sold)
78KZ1000 (sold)
82KZ1100 (sold)
76KZ900 (sold) regret
03ZRX1200R (sold) regret
83KZ1100 LTD Shaft

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suzuki gs850 mikuni cv carbs 17 May 2015 02:03 #672453

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You were running it without any type of filter? Definitely way too lean in that case. would not recommend running it with out a filter on it for any length of time.

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Re:suzuki gs850 mikuni cv carbs 17 May 2015 17:54 #672549

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I have that bike. It will not run right at all without the airbox and filter in place. The CV diaphragms rely on proper vacuum on the back side of the carbs to work right. Also being that you had the carbs apart its likely you need to resynch. check your vacuum at the manifold boots with a manometer. if the carbs are not balanced it will idle like crap and not accelerate well. And be very sluggish accelerating.

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Re:suzuki gs850 mikuni cv carbs 17 May 2015 18:10 #672558

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Agree, you need the airbox and filter before it will run right. You also need to be sure that the airbox end cap foam is sealing, and that the carb and airbox boots are 100% sealed to the carbs. The intake boot O-rings should be replaced and you should clean the carbs properly. Short cuts are long cuts when it comes to carbs.

Check this link for a carb rebuild tutorial...www.mtsac.edu/~cliff/storage/gs/Mikuni_B...Rebuild_Tutorial.pdf

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Re:suzuki gs850 mikuni cv carbs 01 Jun 2015 15:10 #674819

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Speaking of syncing carbs.. I have the gauges but have always had kz/zrx and never needed the threaded nipples. Where would I get those for the 850? Ones that screw into manifolds? Thanks
78KZ400 (sold)
78KZ1000 (sold)
82KZ1100 (sold)
76KZ900 (sold) regret
03ZRX1200R (sold) regret
83KZ1100 LTD Shaft

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