1914 runs good on battery, but rough on mag
Could be coil adjustment, weak magneto output, dirty magneto post or several other ailments.
Note coils that are not properly adjusted will sometimes run better on battery than on Mag. Have your coils been rebuilt by a knowledgeable individual or tested on a hand cranked coil tester or Strobo Spark? See: http://www.funprojects.com/products/ct-1.aspx
Also see: http://www.mtfca.com/discus/messages/257047/298518.html?1341693171 and the link in that thread that goes to: http://www.mtfca.com/discus/messages/257047/298518.html?1341693171
And yes, all of Steve's items could also be a possibility including his "coil adjustment" which is what I discussed above. But if you are not aware that the coil can run well on battery and the same coil can run poorly on Mag you may miss that point.
Hap l9l5 cut off
Before you try anything- test the magneto output using a #1156 light bulb. If you follow the instructions for the test and the bulb blows- then you have a strong!!!!! mag.
If the bulb burns extra bright, then the mag is strong and should power the car fine.
If there is a lot of flickering, then you have a mag problem, or possibly there is debris at the pickup unit causing poor contact.
If the mag system passes, then you need to look into rebuilt coils.
KISS...... Keep it simple ........ Check the mag plug first.
The last "S", as it was told to me, is for stupid. No-one on this forum is stupid so I guess we should insert "smarty" or "silly" or.... Cheers!
The ECCT will give you an evaluation of the magneto output and RPM, besides tuning the coils
I would go for the light bulb - it costs about $2. Very cheap and effective - here's a link to a better description of the Regan - Patterson Memorial Mag Test:
I made this vid right after i got my engine back together with a new field coil and recharged magnets. I don't own an analog meter, just a digital one, so i just wanted to get a general idea of the output of the Mag. It runs pretty strong on Mag yet i was unable to blow out the bulb, although it gets pretty bright. Hopefully will get better data on the output when i get an analog meter.
A successful mag test using a #1156 light bulb.
more food for thought