1987 Johnson 90HP Looper or Crossflow?

[etracer68]

I have a 1987 Johnson 90 HP V4 VRO. I have read about Looper, and Crossflow motors, on here, and was wondering what I have. It is a flat back, not bubble back. The model number is J90TLCU. I have a factory service manual, and didnt read anything about it in there. Just curious, as what I have, the motor runs great.

 

[daselbee]

Re: 1987 Johnson 90HP Looper or Crossflow?

That would be a looper. Characteristics of a looper are the flat top pistons (only a very slight dome). Characteristics of a crossflow are the distinctive high dome top over 2/3 of the piston, and the bypass covers on the sides of the cylinders.

Go to Wiseco.com and look at the pics of the pistons for the two styles.

 

[Dhadley]

Re: 1987 Johnson 90HP Looper or Crossflow?

An 87 90hp is a crossflow. The water cover plates and the exhaust plates are bolted on. Loopers don't have bolted on covers.

 

[etracer68]

Re: 1987 Johnson 90HP Looper or Crossflow?

When I checked compression last fall, I looked in the spark plug hole, and it did look to have high domed pistons. The pistons in the factory service manual shows high domed pistons also. Thanks for your replys.

 

[daselbee]

Re: 1987 Johnson 90HP Looper or Crossflow?

Sorry dhadley, the model number he posts shows a looper. No bypass covers and flat pistons on the evinrude parts pages.


EDIT:
Whoops...I am totally wrong...the little lady has me all messed up today...I was looking at the 140, not the 90 as this OP has posted.

Dhadley is right...this is a crossflow. Parts pages show the domed piston and the bypass covers.