Viva GT: Bottom pulley
Okay I am back from seeing lots of folks who own Viva’s and its given the push today to have a look at the GT bottom pulley. Fist off I agree as a steel pulley its not going to be a clear a signal as an alloy pulley would give in terms of the amount of metal (thats magnetic) for the crank sensor to try and decipher. So first off was to remove the trigger wheel off the pulley, which was a) sweated on, b) glued on and c) screwed on.. it was a case of Mr Butane and heat.
The trigger wheel was then all cleaned up, ready to lay on an alloy pulley to see exactly what we have.
Fishing through the box of old engine parts I found the original alloy pulley from the engine, it will do grand I think.
Dropping the trigger wheel in position I can see I will need to spin down the pulley a couple of mm in order to get the trigger flush with the pulley edge. A couple of mm is modern slang for 80 thou or 1/8th inch if your reading this in Black and White.Its possible a spigot ring maybe required, but I shall leave that up to the machine shop to decide the correct attachment method.
Now I just need to find some more 4mm countersunk screws to replace the ones I removed (poxy hex head rounding, as glued in screws and tiny hex heads don’t mix well)