My 720 has no spark

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

   Hi guys, I used my 720 and hooked up to my tiller to use it and when I was done. I went to park and unload the tiller in its usual spot, but when I went to start the 720 it wouldn't start. I checked and it's not getting spark. Is there anything else besides the coil I should check or replace? I see that there are two wires that go off underneath the carb and intake assembly but don't know what they go to.  Does this have points maybe??  Sorry, I don't know much about this particular engine, it was my dad's, and I don't have a manual. Thanks, Bud.

Edited by BUD76 - 21 May 2022 at 7:40pm

	This site is not affiliated with AGCO Inc., Duluth GA., Allis-Chalmers Co., Milwaukee, WI., or any surviving or related corporate entity. All trademarks remain the property of their respective owners. All information presented herein should be considered the result of an un-moderated public forum with no responsibility for its accuracy or usability assumed by the users and sponsors of this site or any corporate entity.
	The Forum	Parts and Services	Unofficial Allis Store	Tractor Shows	Serial Numbers	History

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
BUD76 Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 03 Jan 2017 Location: Searcy Arkansas Points: 7	Post Options Post Reply Quote BUD76 Report Post Thanks(0) Quote Reply Topic: My 720 has no spark Posted: 21 May 2022 at 7:36pm
	Hi guys, I used my 720 and hooked up to my tiller to use it and when I was done. I went to park and unload the tiller in its usual spot, but when I went to start the 720 it wouldn't start. I checked and it's not getting spark. Is there anything else besides the coil I should check or replace? I see that there are two wires that go off underneath the carb and intake assembly but don't know what they go to. Does this have points maybe?? Sorry, I don't know much about this particular engine, it was my dad's, and I don't have a manual. Thanks, Bud. Edited by BUD76 - 21 May 2022 at 7:40pm

Sponsored Links

IBWD MIke Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 08 Apr 2012 Location: Newton Ia. Points: 3733	Post Options Post Reply Quote IBWD MIke Report Post Thanks(0) Quote Reply Posted: 22 May 2022 at 9:03am
	Yes, points and condenser are next on your list to check.

AcFordHawk Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 12 Sep 2009 Location: Boone, IA Points: 225	Post Options Post Reply Quote AcFordHawk Report Post Thanks(0) Quote Reply Posted: 22 May 2022 at 9:20pm
	The points box is located on the front of the engine below the intake manifold. Picture shows the rectangle shaped box housing the points at the end of the air intake (not a standard set up, it was a mod some previous owner had done) Edited by AcFordHawk - 22 May 2022 at 9:21pm
	IB (restoring), MF GC1705, MF 2705E

AcFordHawk Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 12 Sep 2009 Location: Boone, IA Points: 225	Post Options Post Reply Quote AcFordHawk Report Post Thanks(0) Quote Reply Posted: 22 May 2022 at 9:32pm
	Attached is a parts break down for the points. I have a CCKB manual in digits but may be too large for email or PM. uploads/610/CCKB_points_2022-05-22_21-32-12.pdf Edited by AcFordHawk - 22 May 2022 at 9:34pm
	IB (restoring), MF GC1705, MF 2705E

Steve in NJ Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Andover, NJ Points: 11818	Post Options Post Reply Quote Steve in NJ Report Post Thanks(0) Quote Reply Posted: 23 May 2022 at 7:33am
	Also, check the ignition circuit at the plug by the engine, and also the circuit going up to the points box. It gets pretty damn hot under them hoods, and over time circuitry gets brittle and sometimes the circuit can break losing power all together to the points. It probably wouldn't be a bad idea to check over the whole electrical system in the Tractor. Varmit's get into the wiring over the Winter and chew on the circuitry. Check the ignition switch also. The switches fail on occasions and melt the plug in the back of the switch. Components just get old like we do...... Steve@B&B
	39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife

BUD76 Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 03 Jan 2017 Location: Searcy Arkansas Points: 7	Post Options Post Reply Quote BUD76 Report Post Thanks(0) Quote Reply Posted: 23 May 2022 at 8:53am
	Thanks guys, I'll check all that stuff today. If it turns out to be points, where can I get a good reliable set? Also has anyone come out with a Pertronix kit for it to go to a "pointless ignition"? * update* Turns out it was the points for there not being any spark. I sprayed some contact cleaner and used a little points file to clean them up but they are arcing really bad. I guess this explains the sputtering and bad running just before the spark quit, lol. Edited by BUD76 - 23 May 2022 at 9:50am

estout81 Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 15 Mar 2022 Location: Utica Ohio Points: 34	Post Options Post Reply Quote estout81 Report Post Thanks(0) Quote Reply Posted: 23 May 2022 at 9:49am
	BUD76, That engine looks like a Briggs. I have a generator that has an engine like that and the same thing happened to me. I hooked a regular car condenser to the terminal for the kill switch and ground ground. It runs fine now! About a five min. fix. If it is a Briggs engine there is a electronic unit for it from Briggs. I think it is less than $100.

BUD76 Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 03 Jan 2017 Location: Searcy Arkansas Points: 7	Post Options Post Reply Quote BUD76 Report Post Thanks(0) Quote Reply Posted: 23 May 2022 at 9:58am
	It's an Onan 0.8 liter engine, model CCKB. I guess I need to find a real good condenser source so I don't have to mess around with this too often.

BUD76 Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 03 Jan 2017 Location: Searcy Arkansas Points: 7	Post Options Post Reply Quote BUD76 Report Post Thanks(0) Quote Reply Posted: 23 May 2022 at 6:29pm
	Thanks for the help guys, I got a new set of OEM points and condenser locally and adjusted to .020 and she fired right up a purred so nice!! lol Thank you AcFordHawk for the manual! I learned a little about this little 720 today.