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suzuki gs850 15 May 2015 14:04 #672276

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I know this is kz forum but I'm working on a friend of mines 82 GS850. Carbs seem to be acting up a little... Surprise on a 30+ year old bike. Figured I'd take carbs apart to find a mess. Instead I found internally looks like brand new. Question I have is pilot jets have rubber plugs covering them. WTF? Jets are all clean diagrams look new needles and seats look good. But what's the use of a pilot jet if you cover the hole? Never seen it before. All four carbs have it. Reason for tearing into carbs is bike was not burning on right two cylinders .. Used water on exhaust trick. Left two pipes streamed water away instantly but right two took forever. Finally after warming bike for about 20 min it was driveable and pipes would steam the sprayed water. Ignition is good.. Spark is good in all four cyl. Then last night gas started to come from right carb at rear. Now bike will barrel idle.
78KZ400 (sold)
78KZ1000 (sold)
82KZ1100 (sold)
76KZ900 (sold) regret
03ZRX1200R (sold) regret
83KZ1100 LTD Shaft

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suzuki gs850 15 May 2015 15:06 #672286

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Many bike carbs - mine included - have those plugs over the pilot jets and bike wont run without them. Pilots get their fuel via a small channel off one of the other jets. Take a close look.
leaking one may have stuck float or dirty float needle seat . Sounds like carbs dirty and need a good cleaning
1980 kz750E1, Delkevic exhaust

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suzuki gs850 15 May 2015 20:00 #672317

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That's the thing carbs look nearly brand new. On inside. Where do pilots pull fuel from. ? I got float in stuck and will use carb cleaner tomorrow. Pilot jets look clean but there is obviously done crud somewhere
78KZ400 (sold)
78KZ1000 (sold)
82KZ1100 (sold)
76KZ900 (sold) regret
03ZRX1200R (sold) regret
83KZ1100 LTD Shaft

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suzuki gs850 15 May 2015 20:00 #672318

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That's the thing carbs look nearly brand new. On inside. Where do pilots pull fuel from. ? I got float in stuck and will use carb cleaner tomorrow. Pilot jets look clean but there is obviously done crud somewhere
78KZ400 (sold)
78KZ1000 (sold)
82KZ1100 (sold)
76KZ900 (sold) regret
03ZRX1200R (sold) regret
83KZ1100 LTD Shaft

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suzuki gs850 15 May 2015 20:32 #672321

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All it takes is a tiny spec of crud to block a passage.

It might help get better responses if you give carb make and size as I am only really familiar with the KeihinCV34s on my kz750.

Here's a diagram of my pilot circuit which shows plug, jet, pilot feed, pilot outlet and bypass outlet. Yours may be similar. You can see the pilot feed between 8 and 4



Jet may be clean but dirt in the pilot circuit can block outlet or bypass outlet. If you search here Patton has posted some great diagrams regarding carb cleaning

All the tiny passages have to be clean - poke with nylon bristle or guitar string, spray carb cleaner (wear safety glasses as spray will shoot back at you) and blow everything out with compressed air. Set fuel level if there is a spec for th GS
1980 kz750E1, Delkevic exhaust
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suzuki gs850 15 May 2015 21:09 #672322

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Seafoam soak for 24 hours.... Fill the carbs w straight seafoam. Let soak. 24 hr. Drain. Fill w 100% gas. Try start/leak test.

Sometimes let sit another 24 w gas. 100%, no ethanol....
1980 KZ750H LTD-- pods-- vance & hines 4-1 --speedo/tach/blinker/switch deletes -- brat style

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suzuki gs850 15 May 2015 21:15 #672323

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Short cuts are long cuts when it comes to carbs. Clean them right. Tutorial here...www.mtsac.edu/~cliff/storage/gs/Mikuni_B...Rebuild_Tutorial.pdf
The following user(s) said Thank You: Randombeat

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suzuki gs850 15 May 2015 22:00 #672328

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Carbs are mikuni. They look like my 83 KZ1100 carbs if that helps. I'd have to look in manual to see what mm that are
78KZ400 (sold)
78KZ1000 (sold)
82KZ1100 (sold)
76KZ900 (sold) regret
03ZRX1200R (sold) regret
83KZ1100 LTD Shaft

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suzuki gs850 15 May 2015 23:09 #672330

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Nessism wrote: Short cuts are long cuts when it comes to carbs. Clean them right. Tutorial here...www.mtsac.edu/~cliff/storage/gs/Mikuni_B...Rebuild_Tutorial.pdf


Agreed. But he mentioned they are clean. The seafoam trick worked for me, it wasn't a bandaid or a temp fix, it took care of my stuck float for multiple seasons.... And also took care of a stuck float on my current keihin cv34s...

IMHO, worth a go around. Atleast for a carb refreshing so to speak...
1980 KZ750H LTD-- pods-- vance & hines 4-1 --speedo/tach/blinker/switch deletes -- brat style

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Last edit: by Randombeat.
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