18 hp briggs no spark ?1984 engine - HobbyTalk
 
LinkBack Thread Tools Search this Thread
post #1 of 11 (permalink) Old 03-03-2008, 09:46 PM Thread Starter
Member
 
Join Date: Aug 2005
Location: Oxford ny
Posts: 99
18 hp briggs no spark ?1984 engine

this is an 18 twin engine briggs and stratton model 422707 type018301 code 84057412 ok so the 84 is the year would this 84 engine have points ?that could be the trouble as it has sat outside but had no gas in it carb is soaking right now in cleaner ,for the night where could my spark be ??
timbo is offline  
Sponsored Links
Advertisement
 
post #2 of 11 (permalink) Old 03-03-2008, 09:59 PM
Elder Statesman
 
justin3's Avatar
 
Join Date: Apr 2007
Location: CT
Posts: 649
Send a message via AIM to justin3
Your engine doesn't have points just an Ignition module that provides spark for both cylinders. It would be located under the engine cover. If you have no spark, check your ground connection to the module and gap between it and the flywheel .010-.014 should do it. If the engine has sat outside then most likely there is moisture in the Ignition Module and it may have to be replaced it if doesn't work.
justin3 is offline  
post #3 of 11 (permalink) Old 03-03-2008, 10:16 PM
Member
 
Restrorob's Avatar
 
Join Date: Dec 2007
Location: Everywhere
Posts: 145
If this engine is on a machine disconnect the black kill wire, It's at the right front of the engine where the plug wires exit. It could be a bad safety or ignition switch.
Restrorob is offline  
post #4 of 11 (permalink) Old 03-03-2008, 10:17 PM
Member
 
Join Date: May 2007
Posts: 57
Justin3 is right. The only thing you didn't mention is the spark plug. Did you try another one? It's a real quick test and could save some extra work. j.m.o.

Jake...

Last edited by Jake T.; 03-03-2008 at 10:18 PM.
Jake T. is offline  
post #5 of 11 (permalink) Old 03-03-2008, 11:07 PM
Top Dog
 
30yearTech's Avatar
 
Join Date: Sep 2006
Location: Central Texas
Posts: 6,102
Air gap setting is .008 -.012" for solid state modules .010 - .014" for Points set ups.

As a general rule most engines manufactured after 1982 are solid state ignition.

The Briggs service manual however states that engines with a type number of 0500 and below have points. If your unit has points they will be located under a cover on the front of the engine just under the intake manifold.
30yearTech is offline  
post #6 of 11 (permalink) Old 03-04-2008, 11:11 AM Thread Starter
Member
 
Join Date: Aug 2005
Location: Oxford ny
Posts: 99
so far to go 18 hp no spark yet

Thanks guys for the info on my engine as this is the first twin cylinder briggs i have ever owned , i do though have 15 other L head engines single most are cast iron friom 2hp to 16 hp but twins are a different story ask any mother ,a single is a lot easier to work on ...when its all you know like me so thanks alot for the help so far (the plugs are brand new) , .>>>>>is there any test with a ohm meter<<<< for the coil its self ???,im looking at what i can do to get it to run, its mine and any changes will be for the better ,this has compression, more than any of my other engines.. i cant wait to hear it purr , might run a 36 inch sno thrower on the tractor , time will tell and help from you gents will get to run , this is (the site of friends for friends )and has allways had the info close at hand ,its what makes the hobby of small engines ,very exciting ,by helping the newbie with his small engines , the best advice on the whole web , happy to be here timbo
timbo is offline  
post #7 of 11 (permalink) Old 03-04-2008, 11:20 AM
Top Dog
 
30yearTech's Avatar
 
Join Date: Sep 2006
Location: Central Texas
Posts: 6,102
If you do have a solid state magneto (magnetron), I don't recommend using an ohm meter on it as even a small amount of voltage can destroy the triggering device and render the magneto useless.

Do as justin3 and restrorob suggested and clean the ground and set the air gap to the magnets, isolate the kill from the tractor and see if that helps, if not then it may be time to replace the mag.
30yearTech is offline  
post #8 of 11 (permalink) Old 03-10-2008, 07:06 PM Thread Starter
Member
 
Join Date: Aug 2005
Location: Oxford ny
Posts: 99
ok no points here

looked it over very good today no points any place and in thiking that moisture was the problem i bought a new armeture (coil has two plug wires out of it to the plugs and a ground (where is the fireing trigger) <<< MODULE>>>>,if it has no points must be in the coil its self , i dont understand how an engine that has no points can effectively fire two (2) cylinders with out a break in the spark comming off the magneto as the magnet on flywheel passes the coil LEGS a low voltage current is generated ,now i read in a manule a four cycle engine makes a spark every revolution of engine but it is wasted out the exhaust ,
timbo is offline  
post #9 of 11 (permalink) Old 03-10-2008, 08:48 PM
Top Dog
 
30yearTech's Avatar
 
Join Date: Sep 2006
Location: Central Texas
Posts: 6,102
Quote:
Originally Posted by timbo View Post
looked it over very good today no points any place and in thiking that moisture was the problem i bought a new armeture (coil has two plug wires out of it to the plugs and a ground (where is the fireing trigger) <<< MODULE>>>>,if it has no points must be in the coil its self , i dont understand how an engine that has no points can effectively fire two (2) cylinders with out a break in the spark comming off the magneto as the magnet on flywheel passes the coil LEGS a low voltage current is generated ,now i read in a manule a four cycle engine makes a spark every revolution of engine but it is wasted out the exhaust ,
The twin cylinder coil fires both cylinders at the same time even though they are only used every other revolution. You are also correct even on a single cylinder the plug is fired on every single revolution of rotation, even though spark is only needed every other revolution.

Last edited by 30yearTech; 03-10-2008 at 08:49 PM.
30yearTech is offline  
post #10 of 11 (permalink) Old 08-02-2009, 03:12 PM
New Member
 
Join Date: Aug 2009
Posts: 1
One of the best engines ever made The only problems I have found that has stopped my 18hp twin Briggs in over 25 years has been:

1. Replaced magneto coils twice
2. Rusted flywheel
3. Metal shavings from cleaning rust gathered in flywheel magnet. This shorts out magneto, and simple fix is blow out with high pressure air.
climax102 is offline  
post #11 of 11 (permalink) Old 08-03-2009, 11:34 PM
Elder Statesman
 
Join Date: Aug 2007
Posts: 814
make sure you keep your eye on your oil, they DID have an oiling problem and that was why there are so few left, and they scrapped the design
pyro_maniac69 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