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I'm getting a spark on the safety spark gap above the dynamo
- Micha
- Posts: 759
- Joined: Fri Oct 12, 2007 2:24 am
- Location: Israel
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I'm getting a spark on the safety spark gap above the dynamo
Checked valve & ignition timing.
I start the engine. Left side heats up in seconds to too high a level, I am forced to turn off the engine.
Right side cold to the touch (apparently not working).
While engine idles, I get on the right cold side this spark jumping above the magneto safety system, as said in the subject.
I have a good spark on both spark plugs.
Key is not shutting the engine down, I need to pull the sparkplug cover off from that left overheated side so kill the engine.
edit: this one was fixed: a wire was broken from its solder drop on the ignition switch plate
Can't start right side by itself, again - apparently not working.
The bike run very good before I put it aside 4 years.
Pls note that these copper extensions where made by one of the PO's. They work well
R51/3 1952
Engine Nr. 529466
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- Posts: 256
- Joined: Mon Mar 23, 2015 8:57 am
Re: I'm getting a spark on the safety spark gap above the dynamo
I'm surprised that one of the wrench gurus hasn't gotten u straightened out by now. U say "I have good spark on both spark plugs" ???
U can't have a spark on the plug if u have a spark jumping the mag gap. Hmmm???
Looks to me like u need to go back to basics here & sort things out like why is one side heating up so quickly & how r u judging that? Is the pipe turning red hot right away? If so NOT GOOD! Spark could be seriously out of time or some kinda valve timing issue. It would be good to hear more abt that.
The mag & surrounding area looks generally unsanitary & the coil body appears to have been wrapped with tape at some time, maybe. If so that's a sign that the mag coil has broken down & someone tried a makeshift repair. These r almost never successful, alas. I suggest u get some brake cleaner or starting fluid & spray everything under the front cover & get it cleaned up. Do u have a good plug wire & cap on the right side. Is the ignition timing reasonable?
& yes I notice the homebrew mag safety gaps....WHY? In general terms anyplace u find an unusual owner mod is a place to start looking for trouble. I suspect u have a bad coil but that might not be the case.
Good luck my friend,
Butch
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Re: I'm getting a spark on the safety spark gap above the dynamo
- schrader7032
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Re: I'm getting a spark on the safety spark gap above the dynamo
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
- Micha
- Posts: 759
- Joined: Fri Oct 12, 2007 2:24 am
- Location: Israel
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Re: I'm getting a spark on the safety spark gap above the dynamo
That's why I'm so confused. Can't understand where to look for.
R51/3 1952
Engine Nr. 529466
- Micha
- Posts: 759
- Joined: Fri Oct 12, 2007 2:24 am
- Location: Israel
- Has thanked: 10 times
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Re: I'm getting a spark on the safety spark gap above the dynamo
Yep, measured that as first check. It's 10-11 mm.schrader7032 wrote: ↑Sat Apr 24, 2021 11:19 amThe safety gap on my R69S with magneto is supposed to be 10mm.
R51/3 1952
Engine Nr. 529466
-
- Posts: 256
- Joined: Mon Mar 23, 2015 8:57 am
Re: I'm getting a spark on the safety spark gap above the dynamo
there was a reason the coil was wrapped i suspect & it had some kinda problem early
if i'm not mistaken u also had issues with fuel maybe...have u looked into that ?
is ur plug wire broken ?
what have u checked ?
hard to diagnose without more background
- Micha
- Posts: 759
- Joined: Fri Oct 12, 2007 2:24 am
- Location: Israel
- Has thanked: 10 times
- Been thanked: 4 times
Re: I'm getting a spark on the safety spark gap above the dynamo
Cables for them - are new.
I will try to swapp those cables and see what happens.
R51/3 1952
Engine Nr. 529466
Re: I'm getting a spark on the safety spark gap above the dynamo
Dave