IMO, even a bike with compression of 90 should still run ok if the carbs are tuned right.... I have had several friends rebuild their Yamaha 350's and still couldn't start em-ran bad-flooded one cyl.... The bike never needed rebuilt in the first place, just needed some better tuning...
Heck, my CR125 started 2-3 kicks the whole 7 years I had it and I only rebuilt it twice. Get the carbs sorted out before you tear it apart
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MC21
04 NSR50R
93 CBR F2
98 CBR F3 track bike
95 VFR750
89 FL400R Pilot
90 FZR 4/600