1981 90 HP Johnson - WOT RPM?

[metriccrescentwrench]

A couple of questions:

Suggestions on an economical yet reliable tach?

How many rpm's should I be seeing at WOT?

OK, three questions. Anybody know where I can get a shop manual for this engine. I've got one of the generic manuals and while it serves it's purpose I gotta believe the Johnson shop manual for my particular engine will be far better.

 

[tashasdaddy]

Re: 1981 90 HP Johnson - WOT RPM?

outboardbooks.com for OEM manual. teleflex for tach kit. your motor reaches 90 hp at 5,000 rpms. with the poor gas today , it is recommended to prop it so that you get +- 5,500 rpms. the engine will run cooler, and better propped that way.

 

[Chinewalker]

Re: 1981 90 HP Johnson - WOT RPM?

I've got a 1984 version of the same motor. It'll spin to about 5800 RPM with just me in the boat and is very happy doing so...
- Scott