Vic Bellan
New User
My 1949 cub has a gear reduction system driving the rotor...Why ?
- Thread starter Vic Bellan
- Start date
Janicholson
Well-known Member
The mag turns rapidly to keep the magneto rotation speed at engine speed (to make good electrical power in the primary windings like a generator) This then needs to be reduced to 1/2 engine speed to provide correct timing and direction to the correct plug with the rotor, to fire the cylinder. (4 stroke engines fire after two revolutions) The impulse coupling (snapping noise at starting speeds) is further effort to make the internal generating components move fast enough to fire when cranking by hand at near zero RPM. Jim
screwstick
Member
Do you mean inside the Mag or has it been modified?
If its inside, then it's supposed to be that way to deliver spark only at TDC on compression stroke and not on the exhaust stroke. Distributors has a similar built in function.
If its inside, then it's supposed to be that way to deliver spark only at TDC on compression stroke and not on the exhaust stroke. Distributors has a similar built in function.
Similar threads
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.
Copyright © 1997-2024 Yesterday's Tractor Co.
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy