If you have a servo tester plug it up to your ESC in place of the KR timer.  You can then use the tester to run the motor over it's full speed range.  If the motor runs full RPM range the ESC and motor are OK.  Next step is to try and set the RPM with the KR program stick.

Servo testers are cheep on eBay.  one example is:

https://www.ebay.com/itm/266784709855?_skw=servo+tester&itmmeta=01J86DHJ68WC1DV5KC8VB7RMDK&hash=item3e1d9b9cdf:g:Z2YAAOSwl0xebCQT&itmprp=enc%3AAQAJAAAA8HoV3kP08IDx%2BKZ9MfhVJKk7ThKTfbPonB8JaZ5TZCOZa0I1BciwjfQrY1P1CkT%2FLPiuusBZib6ULsZmnS4kJaxXmZAq4HS1FPTGCks%2F9URJxAHaq14lhVW1ixYA7cRd2fLLnRGS%2BZPNprdPfXhOhFDIhtAt50tjW%2FF3lVdV83erlTXYFNMfHBRkTjW04Bv0IJuPN%2BxmT6Lfb%2F1Y7pijnD15bsuw1grpKxKy3Fh29H9OhIyrW6pmQ%2F8dPSetlmlkh4kJlYSwjBGZeqXboD30JzPeszLLYMPuRklGJcDs2VI3H1XBFra1QCBwzFclh5rJcA%3D%3D%7Ctkp%3ABFBMmqPGzcFk

PS do all of your testing with no prop or a very small prop to keep from frying a motor.  If you use a full size prop keep run times short.

Have you opened up the motor to see if you can spot any damage?  I am querulous as to what kind of a failure mode would cause the motor to run slow.  Also I thought the KR timer would have detected the low RPMs and turned off.   

The prop strike protection on the KR Timer is not active until the motor reaches the governed RPM.

(The Climb_and_Dive timer safely shuts down in a nose over.  )

The prop strike protection on the KR Timer is not active until the motor reaches the governed RPM.

(The Climb_and_Dive timer safely shuts down in a nose over.  )

i want to try this timer but my soldering skills are lacking em nervous to purchase

Some ESC’s (ones that are likely more expensive and overly complex) have programmable settings to adjust the maximum current level that triggers an automatic shutdown. Some also allow for setting how the ESC reacts when it hits that max current. Reacting very fast is the safest but some users may prefer a slower response just in case there is only a brief spike in current.

Soldering electronics isn’t so bad once you get the hang of it. Watch a few videos and practice a bit first.  Failing that, there is the old ask a friend.  https://www.amazon.com/WWZMDiB-Circuit-Protoboard-Soldering-Arduino/dp/B0CMZL4T6J/ref=mp_s_a_1_1_sspa?crid=YSED0OR1OQNR&dib=eyJ2IjoiMSJ9.Hh5tACswELoHBaO8grQ2nY4npdD-nrijVDCk1oeIok4UZqKDLsg7XvPiuYbelUiuT0Kfu4qG8PQQWdbf8Nqh1Q50ek3A5o4RDH-6TMGQiCXiaZNG1NQtMDxwHnoDMhNqUgt68jmly7wuUtAaZo2xoozgQ4lShoXMWh2qo8QpB-ZCvJng9f3GbW8kDha5vpxk1yX8oxsiIlECrYXhNmUoRQ.7-L_CmYHBtokpeCSY56AZoMse5hABq2S49FdAWwzy00&dib_tag=se&keywords=pcb+perf+board&qid=1726864459&sprefix=pcb+perf+board%2Caps%2C139&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9waG9uZV9zZWFyY2hfYXRm&psc=1

Could you post a picture of your current KR setup.

i tried to post  picture but to big file size so far i cant figure out how to resize and send

i just received a new kf governor ver.3 from Brodak i hooked it up to see how it acts have not tried to program it but delay is about 28 sec. then when i push button to start it ramps up to a set rpm for a couple seconds then  drops rpm down is this normal out of box ?

I wrote a post on how  KR timer works.  Give it a read and see if helps.

https://stunthanger.com/smf/gettin-all-amp'ed-up!/how-my-kr-timer-works/msg566404/#msg566404

The KR timer comes with default settings.  When you plug up the battery, with your KR timer switch off, your ESC should beep letting you know that it is armed.  When flip the switch to ON the motor should burp letting you know that the KR timer sequence has started.  Now the start delay time has started.  I am guessing that the default delay, you are seeing, is  28 seconds.  At the end of the delay the motor will ramp-up to full speed.  During this ramp-up the Kr timer is checking to see if the motor is healthy.  If it likes what it sees it throttles the motor down to the set speed.

Hope this helps.