ZR 600,ZR800,ZR900,When installing Powerbreather go up two on the main jets.
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ZR 800 D&D POWERSINGLE ,+2 TIMING KEY,POWERBREATHER=450 MAIN JET
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ZR 800 D&D TWIN PIPES POWER BREATHER( DO NOT REMOVE CONES)510N MJ
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ZR900,D&D TWIN PIPES =490-500 MAINS,RUN MOTOR @7900-8000
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ZR D&D 1010 twin pipes-F-7 needle,540n,560 n Main jets
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F-7 twin pipes-0-2000 ft 500-510 n main jet
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F-8 D&D twin pipe -30 pilots,f-5 needle 2nd clip,510-520 main jets
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F-9ss D&D twin pipes-stock pilots,490-510 main jets
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2001 Thundercat 1000 ,D&D Trail Pipes-380-400 main jets,run motor @8800 rpms
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ZRT 800/D&D 1000 kit-39.5 bored carbs-45 pilots,Q5 needle jet,480-500 main jets
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ALL SPECS TESTED @0-2000 FT ALT  10-30 DEGREES