81 Gs850 Carb Synch

[PAULYBOY]

Does anyone know of an online resource that has a tutorial for synchronizing 4 carbs?

[BassCliff]

Hey howdy hey!

Mr. PAULYBOY,

First let me say...

Let it be known that on this day you are hereby cordially and formally welcomed to the GSR Forum as a Junior Member in good standing with all the rights and privileges thereof. Please note that "good standing" implies pictures! :-D

Our very own Mr. bwringer has some great tutorials here, including a carb sync pictorial/tutorial. There's also a great carb cleanup/rebuild series here.

There's also a valve clearance pictorial in the forum here and a downloadable PDF version here.

Thanks for joining us. This is a great community and a great resource. The good folks here are teaching me to be a better motorcycle mechanic and a better motorcycle rider.

Thank you for your indulgence,

BassCliff
(The unofficial GSR greeter)

[Steve]

Not sure of a "tutorial", but the process is not really that hard.

First, do you have all the tools you need? Before you start a carb sync, you should really do a valve adjustment. When you know the valves are OK, get the sync tools together. You will need:
A set of gauges
A couple of good fans to blow on the engine to keep it cool
A remote gas tank or longer hoses to reach to your stock tank on a bench
A long-shank (8") screwdriver with a 1/4" straight tip
An 8mm combination wrench
A carb sync tool can replace the above two tools

1. Loosen the screws that plug the intake ports to make sure they will come out. Better to do this when the engine is cool enough to work on.
2. Snug the port screws back up, go warm up the bike with a 10-mile ride.
3. Park bike on the centerstand, remove the tank.
4. Remove the port plug screws, install the adapters for the gauge hoses.
5. Hang the gauges from a handlebar or other convenient location and connect the hoses.
6. Turn on the cooling fans, start the engine and note the vacuum readings.
7. Set the idle speed. Some books say 1100 rpm, others say 1750.
8. Use the sync adjustment between carbs 2&3 to balance the reading between those two carbs.
9. Use the sync adjustment between carbs 1&2 to adjust the level of #1 to just above the level for 2&3.
10. Use the sync adjustment between carbs 3&4 to adjust the level of #4 to match #1.
11. Blip the throttle carefully to make sure nothing changes.
12. Remove the gauges, hoses and adapters, install the port plug screws and gas tank, go for a ride.


.

[Suzuki mad]

It appears to be an easy job:- Just....

set the gauges up,
plug them in,
loosen a few nuts and screws,
get the little balls to be at the same height (unless your using Suzuki gauges)

But the bigger ones seem to be getting a few fans to keep the air circulating while you are doing the job and not cooking the engine and getting the tank in a place that it will still feed petrol to the carbs while you are working where the tank normally sits.

As I said, easy!!!!

Suzuki mad.

[PAULYBOY]

Steve, I've already devised an apparatus that looks like an I.V. with a stand at yer local hospital. I've got a 1 quart Gatorade bottle with a tube feeding the in line to the carbs, hanging on a hook from whichever handlebar I'm not close to at the time I'm working on it. I'm assuming when you mention carb numbers you mean 1 thru 4 inline from left to right as you're sitting on the bike.

[BassCliff]

I'm assuming when you mention carb numbers you mean 1 thru 4 inline from left to right as you're sitting on the bike.

That is correct.

Do you have a Suzuki shop manual for your 850? If not, PM me. I think I have an extra one around here somewhere.

Thank you for your indulgence,

BassCliff

[Steve]

Steve, I've already devised an apparatus that looks like an I.V. with a stand at yer local hospital. I've got a 1 quart Gatorade bottle with a tube feeding the in line to the carbs, hanging on a hook from whichever handlebar I'm not close to at the time I'm working on it. I'm assuming when you mention carb numbers you mean 1 thru 4 inline from left to right as you're sitting on the bike.

Hopefully it just looks like an IV setup. The plastics that are used in IV bags and tubing are not compatible with gasoline. :shock:
The Gatorade bottle might not be any better.

Yes, carbs are numbered from clutch hand to throttle hand. 8-[


.

[PAULYBOY]

I've used theses bottles before for small parts cleaning, etc, with gas, paint thinner, but don't try these with laquer thinner. WHOA! That's a trip watching them fold up like the wicked witches shoes when the house fell on her. Anyway, I digress.......just won a Haynes manual on E-bay yesterday for $2.25. Should be here in a few days. I gotta say, you guys rock. My 19 year old son has a 81 GS450T that he's planning on riding. Since he's still at his fighting weight of 175, he fits on it nicely. I'm sure we'll be having questions on that one too.
By the way, Cliff, Your bike was the exact color scheme as mine before I painted it all in realistic flames.