Johnson Crossfire or Loop Induction

[ratkiller]

I have a 1990 Johnson GT150. I'm wondering if there is a way to tell if this motor is a crossfire or a looper at a glance without tearing the heads off to see the pistons? I'm thinking it is a crossfire due to the year of manufacturing but I'm just not certain.
Thanks in advance
Ratkikller

[joe458]

The 90 gt 150 is a crossflow engine.The fuel,air,oil mix flows over the top of the piston.Whereas the loop charged engine the fuel,air,oil mix flows up threw the piston and loops around

[ratkiller]

Thanks for the reply. I kinda thought it was a crossfire but wasn't certain. I couldn't see the piston top well enough to tell.
Ratkiller