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Old Aug 17, 2014, 09:21 AM
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United States, MO, Stockton
Joined Oct 2013
535 Posts
Question
20 cc engine

I'm currently trying to put an electronic ignition, on a 20 cc engine. yeah its a weed wacker engine, but i had it rigged with a prop and it really screamed, the problem was the engine housing couldn't be taken off due to the old ignition system. I bought a timing wheel and the ignition kit, but the instructions are very bad, and I've never attempted this before, the wheel has no markings for what tdc is but i do know the hall sensor is to be put at 25 degrees. is there a thread or a how to do this modification thanks for any input sam
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Old Aug 17, 2014, 05:06 PM
Gas Only
Fokker DII's Avatar
USA So. Cal.
Joined Sep 2010
1,051 Posts
This instruction page May help you.

http://www.rcextremepower.net/ignition_timing.html

Hope it helps.
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Old Aug 17, 2014, 07:21 PM
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20cc

thats pretty much what I'm doing, the marks end up on the bottom side of the engine I guess it doesn't matter where the sensor is so long as the magnet passes at the 28 degree mark thanks sam
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Old Aug 17, 2014, 07:41 PM
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USA So. Cal.
Joined Sep 2010
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Quote:
Originally Posted by slam555 View Post
thats pretty much what I'm doing, the marks end up on the bottom side of the engine I guess it doesn't matter where the sensor is so long as the magnet passes at the 28 degree mark thanks sam
You are right, the engine doesn't care where the hall sensor is located as long as the timing is right. 28/30 deg. is most normal.
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Old Aug 18, 2014, 07:18 AM
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United States, MO, Stockton
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535 Posts
20cc

thanks for the info, if this works well, my stearman is next
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Old Aug 18, 2014, 12:58 PM
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Tel Aviv, Israel
Joined Jul 2004
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you don't have to mount the sensor where the marks are....just make sure that the trailing edge of the magnet is inline with the trailing edge of the sensor (magnet just leaving the sensor) when your 28 deg. BTDC marks are aligned.

take into account that the sensor housing/mount is a bit wider than the sensor itself so adjust for that.
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