89 pro 50 bogs down under a load

[Mattkline205]

have a 1989 Yamaha pro 50 that is bogging down under a load. In neutral it will free rev no problem but as soon as it put it in gear and under a load and give it throttle it misses and bogs down. It’s a 3 cyl compression is 120-top cyl, 118 middle cyl, 120- bottom cyl. It had 3 brand new coils, new rectifier, good stater, good rectifier, carbs have been cleaned even tried putting brand new carbs on it and also replaced the reeds. When I replaced the stater it ran good for one morning then started running bad again.

[99yam40]

2 things I can think of to help a motor run under load is advancing the timing and adding more fuel