Hard to get my suzuki gs550 started,but when warmed up seems to ok.

question edited for clarity.
Question moved from Suzuki Cars to model category.

Wiring

https://www.google.com/search?q=1984+Suzuki+GS550L+fuse+block+wiring+diagram

Service Manual

SUZUKI GS550 SERVICE MANUAL Pdf Download - ManualsLib

https://www.manualslib.com > ... > Motorcycle > GS550
View and Download Suzuki GS550 service manual online. GS550 motorcycle pdf manual download.

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It's a guess, but looking at the wiring diagram, very loose contacts inside the starter relay.

https://www.justanswer.com/motorcycle/1dzu4-anywhere-online-diagram-1983-suzuki.html

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what do the pugs look like? Condition and miles?

Try this link, for download or for sale. Suzuki dealers can order them but they are often expensive if they say it may take six weeks. They have been known to source their own manuals from OEM partslist sellers who have remaining copies.

http://www.pdfgeni.com/book/suzuki-1982-gs550-MANUAL-pdf.html

The following 2 links provide threads to these OEM sellers and have normal on-line shops. Cheers.

http://www.pdfgeni.com/book/suzuki-1982-gs550-MANUAL-pdf.html

http://www.motorcycleparts.com.au/

check the spark plugs better replace them make sure they are to the specs of the engine of yr bike.
You may have to clean the carbs too!

Good luck.
Knight (Yamaha Seca XJ750 A 1981)

Hi. I had a similar problem on an old Suzuki GS550. It use to start and run for a set time and then cut out and would not start until it cooled down for about 4/5 minuets. Then it would start and do the same, and the coils seemed to get quite hot. In my case it was the rectifier. Hope this is of help to you. Regards Tony.