Have a hard starting FC350 that sometimes will run several seconds and then none at all. Since the bike was a non running bike I have run through all the basics: leak down test -ok, spark-jumps a 5mm gap on my spark tester with no problem, Valves are spot on, decomp. on cam moves freely ,fresh air filter, all electrical connections are clean and have dielectric grease, electrical component values are within spec ( even though ohm readings can't always be an accurate indication of condition), all grounds are in good order, fresh 93 octane fuel and new LiFeP04 battery (210 cca). Fuel pump pressure is at 50 psi, injector has been cleaned and tested spray pattern with 9 volt battery, new fuel tank filter and inline hose filter, even the flywheel key has been examined. There are several marks on idle knob that I feel may have screwed up any initial factory settings. My TPS tool is reading.64 , which seems about right but I am wondering if this is miscued by the idle screw adjustment. Question is: What is the procedure for making sure the proper TPS value is at a described voltage when the throttle body butterfly reaches the exact point of "complete closure"... especially when this throttle body allows idle screw adjustments that will alter TPS setting when moved . There has to be a exact point of reference for TPS voltage that coincides with the timing or exact positioning of butterfly. Any ideas or findings on this topic would be greatly appreciated.