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Message started by Kirill Timofeev on 02/18/14 at 21:48:07

Title: carb sync
Post by Kirill Timofeev on 02/18/14 at 21:48:07

Hi folks,

we are lucky to have single cylinder on savage, so no carb sync is needed. I wonder if anybody here had experience with bikes with multiple cylinders and carbs that required synchronization? How difficult is it? Is it doable by average bike owner?

Thanks,
Kirill.

Title: Re: carb sync
Post by gizzo on 02/18/14 at 22:48:56

It's pretty simple. You can use a set of manometers or more likely vacuum gauges. Each inlet stub should have a port (usually blocked by a screw) to tap the gauge into. Then you can adjust the throttles so the gauges read the same at idle. If you have a good ear, you can do it with a hose, used like a stethoscope. You want to adjust the throttles so the sucking sound is the same across all carbs.
When I balance the twin carbs on my old Ducati, I pop the air cleaners off, back the idle screws right out, watch the front slide and stick my finger into the rear carb. With my other hand I just twist the throttle enough to make the carb slide move. When they're balanced, I can see the front one move, and feel the back one move as well, at exactly the same time. If they need adjusting, it's done by altering the throttle cable length where the cable enters the carb lid. Then I just need to adjust the idle screws to get a nice smooth idle and I'm done.
Hope that makes sense.

Title: Re: carb sync
Post by Serowbot on 02/18/14 at 22:49:52

Pfft!... ...it's not terribly critical... mostly only effects idle...
You can do it by ear,... or there are vacuum gauges...

JMHO... I'm easy... :-?...

PS...(just read Gizzo's post... he beat me to the punch. He's also way smarter than me)...
Sooooo... +1 what Gizzo said... :-/...

Title: Re: carb sync
Post by gizzo on 02/19/14 at 04:02:32

awww shucks.
It's kind of important having the carbs balanced nicely. Unbalanced carbs give the bottom end of the engine a hard time, can damage cranks and bearings. Especially old things with roller bottom ends and low oil pressure.

Title: Re: carb sync
Post by justin_o_guy2 on 02/19/14 at 18:33:53

http://www.customfighters.com/forums/showthread.php?t=59518

Build yer own setup.. save $$$

Ive heard of plastic tubing with water. I dont see a pic handy tho.,.,

Title: Re: carb sync
Post by Kirill Timofeev on 02/19/14 at 20:50:33

Very interesting, thanks for sharing folks!

Title: Re: carb sync
Post by pgambr on 02/19/14 at 22:38:47

Quote:

we are lucky to have single cylinder on savage, so no carb sync is needed.

Twice as many everything - nuts/bolts, valves, gaskets, pipes, everything. That was a big consideration on my decision to ride a single. If you take good care of it, that single should last a long time. I wish I learn the benefits of good oil and zddp sooner.

Title: Re: carb sync
Post by mpescatori on 02/20/14 at 02:56:00

Dobro Dan, Kirill, here is what you are looking for :D

http://cdn.instructables.com/FBR/W5XT/H5E9Q2CU/FBRW5XTH5E9Q2CU.MEDIUM.jpg

http://www.instructables.com/id/DIY-DualTriple-or-Quad-Carburetor-Sync-Tool/

:)

Else, this is a more serious, "quasi-professionaol" tool for the "DIY expert" ;)

http://www.carbtune.co.uk/Images/SSL11411SC.jpg

http://www.carbtune.com/

8-)