Need help on 2000 xr6

[Dennyray]

I have replaced plugs, and all 6 coil packs. Engine still not right. Checked compression. Looking at back of motor top left is 120 2nd is 92 third through 6 read 92. It starts a idles great. Doesn't smoke a lot but when I trim down and take off it bogs down like it has no power. What else could it be. Only other thing I know to replace is the voltage regulator. Any help would be greatly appreciated.

 

[racerone]

I would take off the port cylinder head to have a look.----Could be a blown head gasket.-----Could be a lot worse.-------It will only cost you for a new head gasket to learn a lot !!