Re: td20 crankshaft question

[hotrod]

That crank is probably for a TD-15. To use it, you must also use a maverick spark suppressor for each coil. The TD-15 crank cam flat spot is nearly 1/2 inch wide from its leading edge to its trailing edge. The TD-20 crank has a cam flat spot which is 3/4 inch wide. The magnet rotor for the TD-20 crank is stronger and it is marked by a ‘V’ cast on top. This TD-20 rotor may be used with the TD-15 crank only if suppressors are used and only if they are in good condition. The older magnet rotor without the ‘V’ cannot be used in the TD-20 under any conditions. TD-20 models do not use maverick spark suppressors due to the wider cam flat which prevents erroneous sparks. There were 2 styles of suppressors in the TD-15. The first style suppressor on the TD-15 model had an exposed spark on the mag plate where the coil ground wire went towards ground. The second style had a suppressor that enclosed the grounding spark inside of it.