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Understood, I'm wondering if you did want to richen it past a 500 main do you have to go to a 540 instead of a 520? I'm not sure where to find a 510 and if it would actually make it run leaner. In my case, it's suggested to richen the main one step as well as the clip position...

Anyone know if Mikuni has changed their confusing main jet labeling? Some are claiming that a 520 main flows less than a 500... Main Jet......Equivalent...........Fuel Flow (grams per minute) 400............none...................352 420............none...................372 440............none...................392 460............none...................410 480............none...................430 500............none...................453 520............none...................449 510N..........540.....................466 520N..........560.....................481 530N..........600.....................491 540N..........620.....................515 550N..........660.....................538 560N..........700.....................572 Size Comparison: 460 - .073 470 - .074 480 - .075 490 - Did not have one to...

How are you adjusting the base settings (as of 7-28-2020) for the 250 sx as temps are cooling? Digger mentioned that "..that main jet circuit is maxed out right about in that area, 510-515 range." Would it make sense to move the clip to the 3rd position and go to 30 PJ while keeping the rest the same when temps...