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The chart below shows the output of my 1993 Yamaha TZ250E, before and after
tuning by Graham File.
Dyno testing by Dynotech, Basingstoke. 01256 881711.
- First run before tuning. 73hp.
- Best run before tuning (different tailpipes & heads)
73hp but a better midrange
- Best run after tuning - 79hp
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