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my 20 hp twin cylinder B&S engine is over reving. Any ideas on what would cause this?

Take a look at your governor, may be a simple adjustment.

I have seen a couple governor arms slip on the governor shaft this year alone. So will double check static governor adjustment.

Rivets said:

Take a look at your governor, may be a simple adjustment.

Click to expand...

adjustment?????

What are the engines model/type/code numbers?????

The adjustments in this manual, don't need numbers.

http://dl.dropboxusercontent.com/u/12502267/B&S Service Manuals/01_270962SingleCylinderLHead.pdf

In that manual? One can assume it is an old L-Head I guess, but he has a Twin something or other. If it is an Intek or Vanguard, it might take one of those manuals. But either way, they normally don't just fly way out of adjustment.

Then maybe one of these will work. Still don't need numbers, but then again I'm not a counter/parts guy.

http://dl.dropboxusercontent.com/u/12502267/B&S Service Manuals/02_271172TwinCylinderLHead.pdf

http://dl.dropboxusercontent.com/u/12502267/B&S Service Manuals/10_276781SingleCylinderOHV.pdf

http://dl.dropboxusercontent.com/u/...anuals/08_275429VanguardTwinCylinderOHVLC.pdf

http://dl.dropboxusercontent.com/u/12502267/B&S Service Manuals/05_273521TwinCylinderOHV.pdf

Nor a "repair" guy.........

So in what scenario would an engine just go wildly crazy on r.p.m.s, and an "adjustment" actually do
anything helpful?

It is always helpful knowing what engine the original poster has, to give any decent advice at all....

But I was never a "teacher".......... Just someone that actually fixed stuff......

Well..... He is still working on the response.......... Shoot......