Triumphrat

JWoodsie

Carb Synching is the process of adjusting the carburettors, so that each one allows the same volume of fuel/air mixture to enter the cylinders. It is essential for smooth operation and performance.

Spooner

Do you need to be a rocket scientist to do it?

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S.P.O.O.N.E.R.

Huh?



Speedy MattHilda & Thunderasaki

JWoodsie

Nope its quite simple really if you have a good set of guages.

whodatpat

Which means if you have the Morgan guages it is easy. :wink:
Morgan Carbtune Link!

[ This message was edited by: whodatpat on 2005-11-04 13:32 ]

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Patrick http://www.click-smilies.de/sammlung...smiley-083.gif
"I'd rather have a bottle in front of me than a frontal labotomy."

jimmyj900

A little more detail... Synching is adjusting the throttle butterflies so there's equal flow between the individual carbs and cylinders at an idle.

You do that by adjusting the butterfly positions and measuring the vacuum on the exit side of the carbs. When all three vacuums measure the same, the engine will idle at its smoothest.

It's an important part of setting up the idle and in part determines the smoothness at small throttle settings regardless of rpm.

Unless the synch is horribly off it has little effect over about 1/4 throttle.

Jim

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CAUTION: This post may have been altered and critical safety information deleted without the permission or knowledge of the author.

jimmyj900

Well, since I'm no longer employed as a rocket scientist...

The center carb is the 'master' carb on the trple engines and the butterfly position is determined directly by the idle knob. For the other two carbs there are linkage adjustment screws on either side of the center carb.

The gauges connect via a rubber hose and pulsation damper to the take-off stubs at the rear of the carbs.

It's a pretty simple sequence. Connect the gauges, warm up the engine, set the idle, adjust the screws for equal vacuum and repeat the process until there's no longer need for adjustment.

It's helpful to check the balance between the vacuum gauges using 'T' connectors to hook all the gauges to a single carb. A four gauge set is good since if one gauge is off you can use the other three.

An auxilliary fuel tank with a valve and some extra fuel hose are convenient, but you can use the bike's fuel tank on a bench with some extra fuel line to supply fuel.

Jim

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CAUTION: This post may have been altered and critical safety information deleted without the permission or knowledge of the author.

whodatpat

Might I recomend making an external tank out of some hose and a soda bottle and a barbed nipple attached with the cap. Or buy a ready built one. The tank on the bench option is just begging to become a tank rolling around on the ground all scratched up option. :brk:

Luckily I droped the GS tank and not the TB tank.

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Patrick http://www.click-smilies.de/sammlung...smiley-083.gif
"I'd rather have a bottle in front of me than a frontal labotomy."

crosstie

Cool, thanks for the replies all.

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~Crosstie

'99 Speed Legend Retro Cafe Streetfighter

johnyC

Just a small addition to the other posts:

It's not essential to remove the tank and go rigging up a remote fuel supply, I do mine with the tank in place. The screw between the right and centre carb's is easily accessible, and I have a pet screwdriver that fits between the left and centre.

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johny. the boy's happy, leave him alone.

sethshady

I made one of these with a 3-way splitter at the bottom. worked like a charm:
http://www.powerchutes.com/manometer.asp
Cost about $5