The ones I have used gave me predictable changes. No problems. And I have many to compare and choose from. And they cost me less than $15, and I have lots of spares to help out friends jet their carbs.
Also, it is easy to check the jet size. You can see the difference visually. If you want, you can even use stripped wire, straightened paper clips, or wire brads to probe the size of the port. And my OEM PZ30 is an adequate carb for this engine. I really don't have any reason to buy another carb.
One of my goals is to keep the expenses on this bike to absolute minimum.
