Lawn mower throttles?

My friend has a lawn mower with a Briggs and Stratton engine that has no throttle control. And that Craftsman lawn mower that I posted about before, with a Craftsman engine, also has no throttle control.
Can I add one to each of them. Why don't they have them in the first place?
(PS. The Craftsman I posted about a couple months ago seems to be running now, at least for 5 minutes (see next post for follow-up on my previous problem) but it has a 6.5 HP engine that will only run at full speed. It ran so fast, it sucked up all the pine needles from beneath the tree, and I could see that there was no grass, only dirt. The 2.5 HP engines mowed the lawn well enough without sucking up the pine needles. If I had grass there it would be ok to suck them up, but it's so shady and I walk on it so much, I don't think I can grow grass. At any rate, I don't want to run the engine at full blast, even if maybe it is more efficient that way?)
Meirman -- If emailing, please let me know whether or not you are posting the same letter. Change domain to erols.com, if necessary.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Every small engine I have seen has a governor speed control that automtically adjustd the throtlle to try to maintina a fixed speed. If the engine also has a user throttle control, this just adjusts the auto setting. So yes you should be able to add a spring or something to slow down an engine.
CAUTION, an engine with a defective governer can run VERY fast and self destruct prehaps in a dangerous manner. Do NOT do anything that overides the governor control such that it cannot slow it down.
Mark
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
In alt.home.repair on 22 Jan 2005 14:13:06 -0800 "Mark"

Thanks. I wanted to be able to add a lever on the handlebar, so it would be like all the lawn mowers I have had until now.

OK. I'll be careful.

Meirman -- If emailing, please let me know whether or not you are posting the same letter. Change domain to erols.com, if necessary.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.