running rough when hot???

hi there my wr 426 runs mint when i first crack it up but as soon as the engine starts to warm if i rev it the engine takes a while to settle back down?? also when im riding if i give it the beans it misfires a little?? the mods are- throtle stop screw cut down,lid taken off air box, extra holes in air box,yzf header pipe with race end can, standed jetting.:thumbsup: any help will be great cheers danny

Hanging idle typically means you need to open the fuel screw more or possibly need a larger pilot or have a vauum leak.

For the other issue, does it run better when cold than get worse as it heats up? If so, the needle is a bit rich, try moving the clip closer to the flat. If it is the opposite, move the clip the other direction.

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