5hp vertical briggs runs too fast - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
Register Home FAQ Garage MTF Gallery Search Today's Posts Mark Forums Read Store Chat Room

Small Engines and Repair

Midwest Mower Pro

Reply
 
Thread Tools Display Modes
Old 04-11-2012, 06:06 PM   post #1 of 5
luckylulujoe13
MTF Member
 
Join Date: Sep 2011
Location: Kentucky
Posts: 93
MTF Member # 65528
Default 5hp vertical briggs runs too fast

Hello all, my 1969 5hp briggs and stratton runs at very high rpm once started. The linkage is very simple. Spring from throttle to governor and linkage from governor arm to butterfly. I have a service manual for the new l-heads but I can't find this simple(old?) a linkage pictured. I want to be able to control how high the motor revs. Any suggestions?
luckylulujoe13 is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 04-12-2012, 11:17 AM   post #2 of 5
tomw0
2000 Posts and climbing!!!
 
Join Date: Nov 2009
Location: georgia's toe-nails of the foot hills
Posts: 2,097
MTF Member # 34922
Default Re: 5hp vertical briggs runs too fast

The spring wants to open the throttle wide, and the governor linkage wants to close the throttle to limit rpms. The spring is normally on the butterfly, as is the governor 'rod'.
As the load increases, the rpms will start to drop, and the governor pulls on the throttle a little bit less. The spring tries to open the throttle butterfly more, to increase power, and will do so, until the governor pulls it closed again. If the load decreases, the governor will pull harder as the rpms start to climb, and will pull the throttle plate towards 'closed'.
If your governor is not pulling the butterfly closed, either the linkage is binding, or broken, or the governor has either come apart internally, or the governor arm is loose on the shaft coming out of the crankcase, and has become mis-adjusted.
tom
tomw0 is online now   Reply With Quote Quick reply to this message
Old 04-12-2012, 02:27 PM   post #3 of 5
luckylulujoe13
MTF Member
 
Join Date: Sep 2011
Location: Kentucky
Posts: 93
MTF Member # 65528
Default Re: 5hp vertical briggs runs too fast

Quote:
Originally Posted by tomw0 View Post
The spring is normally on the butterfly, as is the governor 'rod'.
I put this together from a box, but I think it goes like this. Please see pic. Look right?
So, I've also messed with the governor linkage. I loosened the arm and turned the rod a bit counter clockwise and tightened it again. The governor seems to be working OK. When I engage the blade and mow up a hill the motor increases rpm when it bogs and goes up the hill just fine.
The problem is more like the throttle is not sensitive enough. I can't get the mower to go medium or slow. It wants to run at high rpm or hits the kill switch by the time I get it down to a reasonable rpm. The throttle assembly is all original and moves smoothly from choke to kill.
Attached Thumbnails
Click image for larger version

Name:	firestone.jpg
Views:	25
Size:	67.2 KB
ID:	208136   Click image for larger version

Name:	firestone-carb.jpg
Views:	50
Size:	44.4 KB
ID:	208137  
luckylulujoe13 is offline   Reply With Quote Quick reply to this message
Old 04-14-2012, 11:38 PM   post #4 of 5
walfish
MTF Member
 
walfish's Avatar
 
Join Date: Oct 2008
Location: MA
Posts: 68
MTF Member # 18550
Default Re: 5hp vertical briggs runs too fast

From the pic, it looks like the idle screw is cranked in all the way and not allowing the butterfly to close down to a slower speed
walfish is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 04-14-2012, 11:44 PM   post #5 of 5
luckylulujoe13
MTF Member
 
Join Date: Sep 2011
Location: Kentucky
Posts: 93
MTF Member # 65528
Default Re: 5hp vertical briggs runs too fast

Doh!!! I'll give it a try. Thanks.
luckylulujoe13 is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 03:23 PM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
Compact Tractor Reviews Tractor Reviews Snowblowers Lawn Mower Forum
My Tractor Forum Snow Thrower Power Equipment Forum
Combine Forum Snowblower Forum ATV and UTV Reviews