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Makotosun

Just in case you every wondered visually how much 3mm btdc was...

  • pabdt
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Just in case you every wondered visually how much 3mm btdc was... was created by pabdt

Every time I install an ignition system, I ask but what if I was off 1mm?   Visually what would that look like on the flywheel?
Well, most of you probably already know and I'm probably late to the party, but here ya go if you don't already: 


The line on the right is 6mm BTDC.  The one on the left is 2.9 mm BTDC.  Used VAPE DT360A system as an example. 
Edit: Oops that is misleading.  If the line to the left was rotated to where the one on the right  is, then its 6mm BTDC.  

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1969 Yamaha CT1 175
1974 Yamaha DT125A
1974 Yamaha DT360A with SP96 Exhaust
Next…196x-197x Yamaha something.
Last edit: 12 Dec 2025 00:40 by pabdt.
12 Dec 2025 00:37 #1

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