Motorcycle Repair: 1978 Suzuki GS750 stored for 19 years, suzuki service manual, fuel pumps

Question
from Doug  doug9058@shaw.ca

1978 Suzuki GS750 after 19 years of storage:
I purchased this bike new in 78 and have stored it for the last 19 years in an unheated Canadian garage.  Foolishly I left gas in the tank and bowls.  I am once again ready to ride so I would like to rejunivate it.  I started with new battery, air cleaner, oil filter, & plugs.  I've flushed about 25 liters of fresh gas through the carbs with the petcock on prime.  I quess I'm lucky cause the bike starts easily but wants to run with the choke on.  Fuel freely runs out of the carb overflow tubes on either prime or on.  

I have the original Suzuki service manual SR-8001.  It is OK but doesn't seem great.  I've gone through almost all of your expert responses covering Carb cleaning 101.  I thought I would start with the recommended Yammy carb cleaner that sits overnight in case I'm lucky and avoid the full carb teardown and cleaning.

Questions:
1 - I presume the petcock is OK as gas freely runs out of the carbs when the engine is running?
2 - Shock seals - is it safe to try them as-is?
3 - Brakes - ditto
4 - Tires - ditto (they look OK)
5 - Would you email me any additional information that may help me concerning carb cleaning, setting, syncing?
6 - Would you say I would be better off with a 3'rd party service manual?  If yes - Whose?

Thanks in advance.  I've enjoyed reading your other responses.
Doug

Answer
Hi Doug,

Thanks for the compliments.

Questions:
1 - I presume the petcock is OK as gas freely runs out of the carbs when the engine is running?

A: Gasoline may varnish in carbs, hoses, petcocks, fuel pumps, etc...  The petcock may be fine, though know they may be the source of a problem, too.

2 - Shock seals - is it safe to try them as-is?
A: Yes.

3 - Brakes - ditto
A: Like gasoline, brake fluid gels with time. If calipers drag or fail to return, disassemble and inspect them. Clean and install new seals. Flush fluid lines and master cylinder and bleed system. Examine hoses for evidence of dry rot.

4 - Tires - ditto (they look OK)
A: Examine tires for evidence of dry rot.

5 - Would you email me any additional information that may help me concerning carb cleaning, setting, syncing?
A: Yes. Check your mail.

6 - Would you say I would be better off with a 3'rd party service manual? If yes - Whose?
A: Try a Clymer manual. Factory manuals are usually more thorough and accurate. You'll have to see for yourself which brand is more resourceful.

See parts microfiche at "www.bikebandit.com"

Visit: "www.thegsresources.com"

Respectfully,
Mark Shively