
Originally Posted by
Jantar
If you consider most piston driven aviation engines (lycoming, continental, etc) are designed to run at around 2500 rpm, avgas is also designed to be a slow burning fuel to give optimal performance.
When Honda were racing the 5 cyl 125 and 6 cyl 250s back in the '60s, they ran the engines on regular grade gas becuase the higher octane fuels were too slow burning. At 22000 rpm there just wasn't enough time for the fire to get going properly before disappearing out the exhaust pipe.
Considering that current 250 4 cyl motors are doing close to these revs, running av-gas in these would be detrimental to performance - even 98 might be too high (ie slow) for them.
it's not a bad thing till you throw a KLR into the mix.
those cheap ass bitches can do anything with ductape.
(PostalDave on ADVrider)
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