20 hp kohler trouble - HobbyTalk
Reply
 
LinkBack Thread Tools Search this Thread
post #1 of 21 (permalink) Old 06-29-2007, 05:52 AM Thread Starter
Member
 
Join Date: Jun 2007
Location: onset ma
Posts: 8
Unhappy 20 hp kohler trouble

i put new rings in, new lifters, push rods. new cam, new muffler,also new carb. engine starts but but when i throttle up gas shoots up and out of the carb. there is good vaccum in crankcase. did a compression check 90 lbs on each side, it should be at least 120. does anyone think the intake valves need replacing. would this cause gas to come out of the carb. engine is out of my 1999 walker here are the spec's mod# ch 20s spec# 64554 dis# 624 ser# 2922306151 any help would be great thanks (also new head gaskets)

Last edited by buzzer12; 06-29-2007 at 05:54 AM.
buzzer12 is offline  
Sponsored Links
Advertisement
 
post #2 of 21 (permalink) Old 06-29-2007, 06:36 PM
Elder Statesman
 
justin3's Avatar
 
Join Date: Apr 2007
Location: CT
Posts: 649
Send a message via AIM to justin3
Did you set the valve lash correct between the rocker arms and valve stem?
justin3 is offline  
post #3 of 21 (permalink) Old 06-29-2007, 11:17 PM Thread Starter
Member
 
Join Date: Jun 2007
Location: onset ma
Posts: 8
could u explain how to do this?
buzzer12 is offline  
post #4 of 21 (permalink) Old 06-30-2007, 12:45 PM
Elder Statesman
 
justin3's Avatar
 
Join Date: Apr 2007
Location: CT
Posts: 649
Send a message via AIM to justin3
Set your engine at TDC (top dead center) on the compression stroke so both valves are closed. You need to look up the valve lash specs from Kohler. To set the lash you use a feeler gage and set the distance between the valve stem and rocker arm to its proper lash by loosening the rocker arm.
justin3 is offline  
post #5 of 21 (permalink) Old 06-30-2007, 05:21 PM Thread Starter
Member
 
Join Date: Jun 2007
Location: onset ma
Posts: 8
where do i put the gauge ?
buzzer12 is offline  
post #6 of 21 (permalink) Old 06-30-2007, 08:55 PM
Elder Statesman
 
scrench's Avatar
 
Join Date: Dec 2004
Posts: 609
these valves are not adjustable , also you should run 10-30 in it (hydraulic lifters) depending on the ammount of vapor you are seeing , some is going to be normal , could be a few things causing it , what plugs are in it should have rc12yc (champion plug) # , could be choke setting make sure the choke is opening all the way up , plug gap double check it , is it just vapor ? or does it look like old faithfull , does it just do it when you throw the throttle to wide open , or does it do it when the engine is running at full throttle , some mist is going to be there when it is running , did anyone work on the carburetor (might have put the wrong venturi in it ) rpm can also have an effect on it .90 sounds ok on the compression , has compression relief on the cam) also if it has not ran much might need to give the rings time to seat , did you have it bored , or hone it ,

Last edited by scrench; 06-30-2007 at 09:10 PM.
scrench is offline  
post #7 of 21 (permalink) Old 06-30-2007, 11:25 PM
Top Dog
 
30yearTech's Avatar
 
Join Date: Sep 2006
Location: Central Texas
Posts: 6,085
Buzzer12, I have a service manual for this engine in "PDF" format, pm me if you would like a copy and I will email it to you
30yearTech is offline  
post #8 of 21 (permalink) Old 07-01-2007, 12:33 PM
Elder Statesman
 
justin3's Avatar
 
Join Date: Apr 2007
Location: CT
Posts: 649
Send a message via AIM to justin3
Sorry for misleading you buzzer, I forgot Kohler's Hydraulic lifters are no adjustable. I was thinking of Briggs and Tecumseh engines.
justin3 is offline  
post #9 of 21 (permalink) Old 07-01-2007, 01:58 PM
Top Dog
 
30yearTech's Avatar
 
Join Date: Sep 2006
Location: Central Texas
Posts: 6,085
Quote:
Originally Posted by justin3
Sorry for misleading you buzzer, I forgot Kohler's Hydraulic lifters are no adjustable. I was thinking of Briggs and Tecumseh engines.
You are not entirely wrong justin3, as some Kohler engines with hydraulic lifters are in fact adjustable. It just depends upon the specific model and spec as to whether it's set up with zero lash or not.
30yearTech is offline  
post #10 of 21 (permalink) Old 07-01-2007, 08:46 PM
Elder Statesman
 
scrench's Avatar
 
Join Date: Dec 2004
Posts: 609
Talking

Quote:
Originally Posted by 30yearTech
You are not entirely wrong justin3, as some Kohler engines with hydraulic lifters are in fact adjustable. It just depends upon the specific model and spec as to whether it's set up with zero lash or not.

do you know what hp; they are , i have never seen one , with adjustable hydraulic tappets , thank you .
scrench is offline  
post #11 of 21 (permalink) Old 07-01-2007, 11:01 PM
Top Dog
 
30yearTech's Avatar
 
Join Date: Sep 2006
Location: Central Texas
Posts: 6,085
Quote:
Originally Posted by scrench
do you know what hp; they are , i have never seen one , with adjustable hydraulic tappets , thank you .
I am not sure how many different models have the adjustable valves, but I have seen them on some of the newer command 15hp single cylinders.


http://www.hobbytalk.com/bbs1/attach...id=43274&stc=1
Kohler_CV_Adj..pdf

Last edited by 30yearTech; 02-06-2015 at 07:59 PM.
30yearTech is offline  
post #12 of 21 (permalink) Old 07-01-2007, 11:26 PM
Elder Statesman
 
scrench's Avatar
 
Join Date: Dec 2004
Posts: 609
ill be a monkeys uncle , ive never seen em but they do exist , parts smart don't show em at least not that i could find , might be a kit a guy could put on if he felt the need , i wonder if they are a flat tappet (solid ) kit humm might be , have you seen them b-4 ? i thought all kohler valve in head used non adjustable , i like the first design in the pdf , the one on the top left with the rod through the rocker , seems they would stand up better , have seen them , i did pull my hair out on a kohler 20 one time the thing came in with a dropped valve , i just thought the retainer came loose (governor) set at like 4500 rpm. anyway i done a valve job slapped the motor back on started it and ran for about 2 minn , done it again . so i tore it back down everything looked ok used putty on the pistons turned it over and sure enough interference , turned out the gear on the crank had turned , it was just pressed on , did not like that design , had to change the crank to fix , looked like they would have used the woodruff style , this could be a possibility on "buzzers' " , but i guess it could be the valves . possibly wet dry should tell something shouldn't it ? ,,,,,,,,, you are right man i have seen them on command 15hp yeppers , all that carb spray must be taking its toll on me , aint nothing right on the left side of my brane and on the right there aint nothing left , thanks 30

Last edited by scrench; 07-01-2007 at 11:30 PM.
scrench is offline  
post #13 of 21 (permalink) Old 07-02-2007, 07:27 AM Thread Starter
Member
 
Join Date: Jun 2007
Location: onset ma
Posts: 8
all i know is that when it does start , at full throttle ,open choke . it spits fuel up and out of the carb . it will run fine at half throttle. now when i put the air filter back on an then try to start it it won;t start. this engine is in my walker and walkers must be at full throttle when cutting grass. it wont start with the choke on . it must be open wide , half throttle then it take a while but it will start . i just git to fix the fuel shooting out of the carb. if i undo the intake valves and crank it it does not shoot fuel out of the carb. is it time to take it to the shop . they want 150 to open the engine and 150 to close it, thats with out fixing any thing please helpppppppppp!!!
buzzer12 is offline  
post #14 of 21 (permalink) Old 07-02-2007, 08:51 AM
Top Dog
 
30yearTech's Avatar
 
Join Date: Sep 2006
Location: Central Texas
Posts: 6,085
It could be possible that the camshaft is out of time, are you sure you got the timing marks lined up when you reassembled the engine?
30yearTech is offline  
post #15 of 21 (permalink) Old 07-02-2007, 07:25 PM Thread Starter
Member
 
Join Date: Jun 2007
Location: onset ma
Posts: 8
yes i lined up the timming marks
buzzer12 is offline  
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the HobbyTalk 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:
OR

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 Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search



Posting Rules  
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome