I have a ex27 motor with no spark... I disconnected the 2 orange wires from the charging coil to the regulator and checked the charging coil for shorts to ground and for opens between the 2 wires... checked good. Ive left the wires from the charging coil to the voltage regulator disconnected since my understanding is thats just for lights and to charge the battery...I Replaced the ignition coil and still no spark... I want to know if the flywheel has a built in diode or something that can be bad... If you need pics let me know... I have the flywheel off now and stator... Dont want to just throw parts at it Ive done that once now with the coil.... Please please help... I did try another spark plug~
please help ex27 robin subaru no spark
- Thread starter mogyver69
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Anyway one? Im still fighting this this thing! Im wondering if theres a sensor built into the flywheel that can be bad cause the only thing else to replace is the charging coil.... I always thought they called that part a stator but in the parts manual they called it a charging coil..... I only see 3 items in the ignition system to create spark.... flywheel, charging coil and ignition coil... Unless on this engine you have to have the voltage regulator too in which case that could be bad.....
Doc Sprocket
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The only thing in the flywheel is a magnet (unless those PARTICULAR engines have some kinda freaky-deaky crap I don't know about.
How's your magneto air gap?
How's your magneto air gap?
theres only 3 things that run the ignition on my motor... The ignition coil which I guess is considered a magneto , the charging coil which I would call a stator and the flywheel which has magnets inside it... Then theres a voltage regulator/rectifier which im told can be disconnected cause all its for is the battery to charge it......... The ignition coil has no power wire ran to it to give it power.... Only a ground wire to stall the engine.... I was assuming the flywheel and all its magnets run around the charging coil creating a a/c voltage and when the magnet on the flywheel hits the magnetto/coil it energizes it. So there has to be something inside the flywheel that allows the voltage to run thru it to energize the coil or something... The magnet on the flywheel does have a plastic case between the flywheel and the metal plate where it gets its signal to the coil/mag.....wondering if theres a coil or diode of some sort in there..... the charging coil has no shorts to ground..... $180 for another flywheel is a bit much to guess but I already changed the coil/magneto so whats left.... Do I need the voltage regulator /rectifier connected. Is it possible its a igniter as well? The engine is a ex27 robin
I think I just figured it out.... The flywheel acts as a magnet and the coil has a magnetto built into it on this engine. I also have a charging coil inside the flywheel used to charge the battery... On this engine what runs the engines spark is the ignition coil and the flywheel... So if I replaced the coil already which has its own magneto and my air gaps are good then my flywheel is the problem. But let me explain..... The magnets must be week! Ive been reading threads about the magnets loosing there strength and causing a week spark... My engine ran fine before I parked it. When I later tried starting it after many months it would no longer start.... No spark. I assumed it was the coil/magnetto but that didnt fix it... Must be the magnets need a recharge. The kart is 8yrs old after all and hardly used..... Anyone know who to call???? Its $180 for a new flywheel.....
Russ2251
AZUSA:Powered by LAWN-BOY
Exceedingly rare that magnets go south (pun intended).
Stick something steel or iron to magnets. If magnets have a strong attraction, you should be good.
I'd hate to see you buy a new flywheel only to find out there is still no spark.
Stick something steel or iron to magnets. If magnets have a strong attraction, you should be good.
I'd hate to see you buy a new flywheel only to find out there is still no spark.
Doc Sprocket
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No, the flywheel contains a magnet. Now, when you say, "my air gaps are good"- what is "good"- did you gap to spec using a feeler gauge? And not multiple "gaps", one- coil to flywheel magnet. For a no-spark condition, charging coil gap (if applicable) does not matter.
Stop it, you're killing me!!!
No, the flywheel contains a magnet. Now, when you say, "my air gaps are good"- what is "good"- did you gap to spec using a feeler gauge? And not multiple "gaps", one- coil to flywheel magnet. For a no-spark condition, charging coil gap (if applicable) does not matter.
My coil has 2 spots you have to gap using a feeler gauge rather then the standard single location. Using the manual and there specs of 3mm I gapped both locations using 2 feeler gauges one for each location....
I called Robin subaru direct, They indicated only 2 things that cause spark on that engine. Coil and flywheel... The coil has its own magneto built inside and the flywhhel charges the magneto creating a spark... They agreed that they had never herd of a bad flywheel with week magnets and suggest that I got a bad coil. Im ordering another coil... I will let you guys know... If it doesnt fix the problem robin subaru said the only thing it can be is the flywheel. Im buying a factory coil first. $75 Just a note robin subaru has technical support available and its free.... There phone number is listed on there website.....
Thanks for the info. I contacted robin subaru technical support team direct, They agreed with you but also said if I had a known good coil that it had to be the flywheel cause those are the only 2 items that cause my engine to have spark other then if I had a short to ground to my coil. Im ordering a factory coil from the manufcator because the coil I did purchase was after market and may =be a defective item.... Ill keep you posted...
Still working on this issue... I finally found some spark. Using a spark plug tester that has adjustable gap I closed the gap to .6mm and started seeing spark. Almost immediately when I started opening up the gap on the tester my spark started weekening and I got intermintent spark... My spark should be alot stronger then that other wise the compression would interfear with the plug.. I got a suggestion this evening to check the spark plug boot. Its the plastic style... I also connected my spark plug back up to the boot grounding it to the chasis. No spark.... Regapped the plug from .8mm to .6mm and boom spark... I did put the plug back in and tried starting it, nothing.... Bought a brand new spark plug NGK stock plug , didnt help.... Im think we have week magnets on the flywheel.... But I can feel the pull using a wrench and touching the magnets....
Doc Sprocket
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I think the coil's bad. I have experienced coils that will produce a weak spark that is insufficient to ignite the mix in the combustion chamber, even when ether is applied.
This is where CDI systems are a PITA. Back when a coil was a coil, you could test it with an ohmmeter and know whether it's any good or not by comparing your readings to the specs.
This is where CDI systems are a PITA. Back when a coil was a coil, you could test it with an ohmmeter and know whether it's any good or not by comparing your readings to the specs.
I guess its possible I got a defective new coil.....Because I did replace it already... The only thing I havent checked is the plastic spark plug boot that attaches to the wire... Was gonna ohm test it today but got buisey with other projects.....
anderkart
Moderator
Good idea, I dont know about Robin-Subaru's, but the GX-Hondas have a resistor built into the spark plug boot to help minimise radio/TV interference. Maybe yours has this same feature and your resistor is defective. You could stab a pin into your plug wire and run an ohm test, or just cut your old boot off and try installing a regular/non-resisted replacement boot.
Tested the boot its fine. Took my coil to a friend with my boot.. Turns out he had a motor that uses the same coil We pulled the coil from his motor and thru mine on... Coils fine... I have a bad flywheel.... Working on getting one ordered....
Russ2251
AZUSA:Powered by LAWN-BOY
Compare magnet strengths when you get the new flywheel.
Incidentally, some older mower shops have the ability to recharge magnets.
http://home.comcast.net/~rake60/flywheel_magnet_recharger.htm
Incidentally, some older mower shops have the ability to recharge magnets.
http://home.comcast.net/~rake60/flywheel_magnet_recharger.htm
Thanks for the reply. Ive done alot of research and found although I could have the magnets recharged most magneto shops dont have the specs for this flywheel. If the poles on the magnets somehow flipped they would just be recharging the magnets in the same direction which wouldnt help much.. I decided it was less hasel to just order a new flywheel. I actually just finally ordered it this evening. Cost me $181 shipped...
crazyman
New member
I've seen motors that were 50 years old run with the stock flywheel... I also have never seen a motor that wouldn't run with the coil gapped from the flywheel with a business card as a gapping tool.
My bet would be the kill circuit is shorted or the flywheel key is sheared.. Or just a crappy spark plug.
My bet would be the kill circuit is shorted or the flywheel key is sheared.. Or just a crappy spark plug.
In answer to all you guys it was the flywheel.. I thought I had reposted the results but guess not... The flywheel had week magnets. Just to be clear Ive been all over the internet now the past 2 yrs and im not the only one with this issue with this motor... The factory will even tell you its probly a coil and its difficult to get them to even want to sell you a flywheel until after you spend the $90 for there coil so they can then stick you again for the flywheel... They will tell you theres 1 and a million chance its the flywheel but unfortunitly Ive spokane to about 4 other people with the same problem... They all changed the flywheel too and it fixed it. Unfortunitly getting a flywheel is a waiting game cause they have none in stock so they have to order direct from china which usally takes a month or two. For the other 85 to 90 % of the people it will be the coil.... Good riding.. I sold my buggy after getting it running..... Good luck guys... For the money you might look into a harbor frieght engine... there on sale all the time for $99
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