I need to know how to setting the looper timing on my Juki MO-655 serger. I don't have time to chase down a repair guy. Costume rush job.

Most likely. Most overlockers can make a rolled hem. You will probably want to do a lot of practicing on scrap chiffon before trying it on the real thing. It involves using only one needle, both loopers, and making appropriate adjustments to the machine.

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Bernina has some very nice Serger Workbooks that could be helpful:
Bernina Mastery Workbooks

Most manufacturers offer free PDF manuals online.

Could be a timing issue.

How to fix timing on serger

Serger Timing Fixed

SiRUBA Overlock Timing between Needle and Looper

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Laura Blog Do it yourself serger repair How to adjust serger timing

if you go to this page http://www.juki.co.jp/household_en/serger/index.html there are the current household sergers from Juki and a four page threading diagram for them showing the different stitch set ups.

If your serger is a domestic one too (the MO in front makes me think so) then you may find that the threading up is very similar on your model. Stitch length is usually a kob on the right marked from 0.5 to 4 and differential feed knob is usually there too, usually marked from -0.5 up to 1.5. Tension settings are usually around 5 but you adjust the looper tensions to suit the fabric and how wide you are trimming it with the blades.

You could contact Juki or their local distributor in your country and arrange to purchase manual for your model. http://www.juki.co.jp/household_en/dl/index.html this page gives a listing for countries.

it is also available on line to purchase as a black and white pdf file, http://www.sewusa.com/Sewing_Machine_Manuals/Juki_Manuals/Juki_Industrial_Sewing_Machine_Manuals/MO-2500_Instruction_Manual.htm for $8USD

Go back to the seller. If it was listed as new and does not work, the seller should either repair, replace, or refund. Note--you may need to get eBay involved in case the seller refuses to address the issue. EBay will refund your money and reverse the charge to the seller.

you have to get the door fixed, juki is set up to power off if the door is open for safety reasons

How to Thread Juki MO-134 Serger from watching lady at Lyles. Turn upper blade up. Push in first then turn up.It makes threading easier. Blue Thread upper looper first. Pull thread through tension knob. Don'tjust lay it there. (She thought that is what I must have done) Orange Thread lower looper next. Pull thread through tension knob as inthreading upper looper. Adjust lower looper so it is right nextto upper looper so that their points are almost together and directly belowsewing needles. Lower looper will be in front of upper looper (I believe). With tread from upper looper pulledback, slightly lift lower looper above upper looper and thread. I think this isright. Pull thread back with other thread. Tension is the key. Remember that. Yellow: Thread left needle first.Remember tension. Pull thread through curled wire on left side of needle arm. Green: Thread right needle. Rememberabout tension. Pull thread through curled wire on right side of needle arm. b> Note: Before sewing turn the wheel tomake sure the stitches are going together correctly.

This video starts off a little ****, but expected if you have ever visited the Threadbanger site - http://www.metacafe.com/watch/1462325/how_to_use_a_serger_indie_pendent_designer_spotlight_thread_he/ Not your brand, but the same "serger basics". Lift the antenna to it's highest position. Set the tensions to zero. Have the presser foot up when threading. Raise the upper looper to it's highest position. Sergers are great little machines, but they can be nerve racking when it comes to threading. After years of threatening my old FunLock, I bought a Babylock Imagine with air-jet threading - what a relief!

Open the font of the serger and the instructions will be printed on the serger or on the door.

Raise the presser foot and set the tensions to zero when threading.

Turn the hand wheel so the upper looper (curved one) is at it's highest point and thread it first, and then the lower looper.

With some sergers you must thread in a certain sequence. This should be indicated in the instructions on the serger.

Set the tensions back to normal ( 4 - 6), lower the presser foot and run a length of stitching to see if the threads are knitted together as they should before you start serging your project.

The extension plate must be easily removed,
therefore has to be easily attached.
Usually they are slided in from left to right.
If you can upload a picture of the extension table, may be I can help you more.