rossHinckley

79 Yamaha RX 125 discussion forum:


rossHinckley

rossHinckley 
13Phoenix said 2012-03-13 05:09 
 
hello out there in yamaha flavoured cybberspace,

does anyone have porting details for 79 rx125?
specifically:
exhaust port size (mm)
exhaust open (degrees)
main transfer port open (degrees)
secondary transfer port open (if applicable)
rear boost port open (degrees)
exhaust port + gasket length (mm)
i´ve downloaded expansion chamber design software, and can pull apart and measure, but would be easier if the data is out there.
2 Stroke Wizard 4.

btw have recently installed MotoTassinari Vforce 3 reed valves. the V384A fits with a bit of drilling on the bolt holes. carbon fibre petals, definite improvement, plus the peace of mind that when fatigue finally happens, you don´t get metal falling into the works.
cheers, ross 
 
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