DIRT TRICKS
Countershaft Dome Washer
When performing hardness tests on the KTM spring washer, Dirt Tricks determined that it was not much of a spring, and yielded the first time is was compressed and would not spring back. 
We solved the problem by producing a through-hardened, tool-steel replacement spring washer that acts like a true spring. 
When removed, unlike the KTM washer, it returns to its original dome shape. 
The Dirt Trick dome washer can be repeatedly re-used. It is extremely hard and tough.
So if you have a counter-shaft oil leak, start by replacing your spring washer with the Dirt Tricks dome washer..
Fitment From Parts Finder:
HUSQVARNA (17-25) 125-300 All 2 Stroke Models
Also fits Models Below:
HUSQVARNA  (14-25) 250-501 All 4 Stroke Models
KTM (17-25) 125-300 All 2 Stroke Models
KTM (99-25) 250-530 All 4 Stroke Models
BETA (05-25) 350-520 Al  4 Stroke Models
GAS GAS (21-25) 125-500 All 2 & 4 Stroke Models
         
        
          DIRT TRICKS
Countershaft Dome Washer
When performing hardness tests on the KTM spring washer, Dirt Tricks determined that it was not much of a spring, and yielded the first time is was compressed and would not spring back. 
We solved the problem by producing a through-hardened, tool-steel replacement spring washer that acts like a true spring. 
When removed, unlike the KTM washer, it returns to its original dome shape. 
The Dirt Trick dome washer can be repeatedly re-used. It is extremely hard and tough.
So if you have a counter-shaft oil leak, start by replacing your spring washer with the Dirt Tricks dome washer..
Fitment From Parts Finder:
HUSQVARNA (17-25) 125-300 All 2 Stroke Models
Also fits Models Below:
HUSQVARNA  (14-25) 250-501 All 4 Stroke Models
KTM (17-25) 125-300 All 2 Stroke Models
KTM (99-25) 250-530 All 4 Stroke Models
BETA (05-25) 350-520 Al  4 Stroke Models
GAS GAS (21-25) 125-500 All 2 & 4 Stroke Models