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79 GS550E LOW/No Sprk Hot start
Posted: Wed Aug 09, 2006 10:23 am
by 02busa82
My 79 GS 550E starts and runs fine cold. Once it has warmed up, and I shut it off. It doesn't like to restart. I checked for spark with a spark tester and got a very week light. I replaced the sprk plugs and wires 2 yrs ago however I think everything else is OE. Anybody know for sure what the problem is?
Posted: Wed Aug 09, 2006 4:15 pm
by oldschoolorange
if there is little spark when hot it is because there is high resistance somewhere. Change your plugs to start and check how hot your CDI unit and coils are getting IF you can mount your Capacitor in a diffrent location closer to the airflow it would'nt hurt
Posted: Thu Aug 10, 2006 4:40 am
by 02busa82
would it be wise to just change the coils?
Posted: Thu Aug 10, 2006 5:15 pm
by BuzZz
02busa82 wrote:would it be wise to just change the coils?
It might be wiser to test the coils when both cold and hot first. It could well be the coil(s)... how many does the bike have? I would have guessed just one with 2 output leads, but I don't know for sure.
Posted: Fri Aug 11, 2006 6:28 am
by 02busa82
There are two coils with two leads each. What is an effective way of testing these coils?
Posted: Fri Aug 11, 2006 5:30 pm
by BuzZz
My mistake, I assumed the 400 was a twin, not a 4... anyways....
The correct procedure and values for testing the coils will appear in the service manual.
Posted: Tue Aug 15, 2006 4:34 am
by oldschoolorange
test them with an ohmmeter. put 1 of the leads into teh spark plug end and the other to the positive terminal on the coil itsself. I can not give you specifis values on the resistance that you should be seeing, but a factory service manual usualy has that info. if you can not get that info from the dealer then try finding your manual here
http://www.manualclub.com/
Posted: Tue Aug 15, 2006 2:19 pm
by 9000white
unless it has been changed the 79 gs550 has breaker point ignition.
Dyna makes an electronic unit that will replace the points and give you electronic ignition.if it has points the gap sets at .012-.016. the timing sets at 17 degrees btdc idling below 1550 rpm. i changed my 78 550 to the electronic unit for $149.00. it was worth it.
Posted: Tue Aug 15, 2006 3:45 pm
by 02busa82
I have the manual for the 77- 78 and I believe everything is the same for the 79. I will check the points and I am considering this unit by Dyna. Thanks for the sugg. Keep the ideas coming!!
