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MX, SX & Off-Road Discussions
General Moto | Off-Topic Posts
old vs new
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[QUOTE="helio lucas, post: 1429726, member: 78346"] probably different type of engines... racing and street engines have different states of tune. modern simple two stroke road going 80cc engines may not have any more than 10 hp... a racing mx 80cc from the '80s may have the same power as modern 85's. even in road engines there is a huge variation. tzr 125 yamaha engine (yamaha, not minarelli) is power valved electronically with stepped motor with more or less modern technology and puts 20 hp (great smooth engine BTW with a big, large, flat torque curve). aprilia rs 125 engine (rotax) is mechanically power valved (although the solenoid is controlled electronically) but with a on-off actuation, puts almosy 30 hp... they both are very similar on tech but the reeds of the yamaha goes on the crankcase and the aprilia goes on the cylinder. small things does the most gain! [/QUOTE]
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MX, SX & Off-Road Discussions
General Moto | Off-Topic Posts
old vs new
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