Thread: My Yamaha SR250
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Old 07-29-2018, 07:21 AM   #15 (permalink)
cRiPpLe_rOoStEr
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Quote:
Originally Posted by Grant-53 View Post
Depending on the fuel available alcohol injection or some other means to reduce pre-ignition might be needed.
If the OP settles on more extensive engine mods instead of the aerodynamic and riding style adjusts it would be quite tempting to try a Prius-ish emulation of the Atkinson cycle in order to avoid the need for either premium fuel or any supplemental injection. Even though I am favorable to warer/alcohol injection for special/high-performance applications, it may not be the most practical approach.

BTW it may be easy to do the tuning without removing the engine block in the motorcycle, but in the bakkie if the OP eventually decides to get a fuel efficiency-oriented cam regrind it wouldn't be so easy to do so without taking the engine out since it features an OHV engine.
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