Ok so i have jus done a complete rebuild (crank, pistons cylinders recoated etc) on my 92 model 21. After a few hiccups getting it back together the engine is now bolted in and running. my problem is the front cylinder doesnt fire until the bike hits 6500-7000 revs. It runs fine over that but as soon as revs drop back past 6500 front cylinder dies?? there is heaps of spark, tried different plugs, looks to be plenty of fuel.. I really have no idea ?? any help would be great!
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Hesitation is Fatal!!