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XR650R MIKUNI PUMPER problems

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hey all.. i have an 2002 XR650R with a stock motor with the Xr's only rev limiter box, Twin AIr backfire screen eliminator, holes in air box and an Arrow full titanium exhaust and i am having issues with the 40 mm Mikuni Pumper..

i am in nyc elevation.. the bike wont start and when it does it overheats and wont stay running. i have changed the jetting to all the recommended setting fuel screw 2/12 out raise - lowered the needle.. i have done it all and have gone back and forth... at at this point none seem to work. ...

i need to go back to square one. where should i start?

main?

pilot?

fuel screw?

any other suggestions?

thanks

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