Mac ignition.

jvan777

Newbie
Joined
Jun 4, 2016
Messages
23
Location
Jackson,Mi
I have been trying to get My Bensen B8M running.It has the 4318 McCulloch motor with the magneto. The motor has not been run in quite some time. I checked for spark but it appears to have none so, I tried cleaning the points. What would be the next thing I should check? Or, Does anyone Know of a good source for a CDI ignition upgrade for this motor? Any information would be greatly appreciated. thank's: Justin
 

digbar

Gold Supporter
Joined
Mar 5, 2006
Messages
153
Location
Columbus, OH
Aircraft
Challenger II, Sparrow Hawk, Bensen B8-M
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about 535
Check with Rick Whittridge for an electronic module to replace your points. Assuming that the magnet is OK and still producing a magnetic field, Rick's module should get you going and troublefree.
 

dabkb2

Dave Bacon
Joined
Sep 26, 2005
Messages
2,198
Location
Vista, Ca
Aircraft
2 KB2 90Mac KB3 582
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289 hours
Rick is no longer making the conversion, when you pull the prop through the mag should make a loud clicking sound, if not it will not spark. try tapping the mag with a hammer, it should loosen the magnets and spark.
 

jvan777

Newbie
Joined
Jun 4, 2016
Messages
23
Location
Jackson,Mi
Thank's Dave. The mag is making a loud clicking sound when I pull it through But I still have no spark. I wonder if there may be corrosion in it from setting so long.
 

neutrax

rat now
Joined
Jan 10, 2012
Messages
321
Location
redmond
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1966 bensen 2015 SC M912
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580
I thought if a hammer doesn't fix it, it must be electrical but evidently they work on electrical things too.
 

dabkb2

Dave Bacon
Joined
Sep 26, 2005
Messages
2,198
Location
Vista, Ca
Aircraft
2 KB2 90Mac KB3 582
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289 hours
The magnets might need recharged, R&D does it.
Netrax, you just need a bigger hammer
 

farmboy

Junior Member
Joined
Apr 14, 2017
Messages
19
Location
Sheridan Lake, CO
Justin, how did you go about cleaning the points? I assume that you also checked to make sure that they were gapped correctly, and that when you cleaned the points, you used something like a points file or emery cloth that would remove rust. I was told years ago that using a dollar bill between the points was a good way to clean them (open the points, slide the bill between, close the points, and pull the bill out.
The thought was that bills don't leave lint, and adsorb any oil, and dragging the bill out will remove dust. One time a friend had a motorcycle that he couldn"t get spark on, and we tried the dollar trick, and still no luck. He sprayed the open points with a solvent (electrical cleaner, or starting fluid, etc.), and while they still had the solvent on them he blew them out with compressed air. Surprise, surprise, he had spark!
 

jvan777

Newbie
Joined
Jun 4, 2016
Messages
23
Location
Jackson,Mi
Thank's Farmboy. I used very wore out 400 grit paper. Then I pulled a business card through to remove any debris . I will try the cleaner and compressed air. Thank You.
 
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