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| *Vultures Knob>>>Dirt Bike |
What do you think is better 2stroke or 4 stroke on dirt bikes? |
What do you think is better 2stroke or 4 stroke on dirt bikes? If we're talking about playbikes, trailbikes, beginer bikes, ect, the above posters are close to being right. If we're talking race bikes, most of them are, well, clueless. The new generation Racing Four Stroke (RFS) bikes are high revving, fast wearing, maintainence intensive bikes that require the rider/wrench to stay on top of the beast mechanically, and put a hurting on your pocketbook everytime you need parts for it. The 10,000 + rpm engines eat valves and valve seats on a regular basis & piston wear is an issue due to the skirtless design. Some are even having big end rod bearing failure issues that grenade the whole engine when they let go. Emissions friendly? Give me a break. There are very few stock RFS bikes being raced or riden, most have aftermarket exhausts and richer jetting to compensate for the pipe change. At that point all bets are off boys. That engine is far more dirty than any well tuned two stroke. Remember, four strokes like to be rich, on a 2 stroke lean is mean... KTM, Gas Gas and Yamaha have committed to the 2 stroke for the foreseeable future, Suzuki and Kawasaki are waiting to see what sales numbers do before committing one way or the other. Don't kid yourself, sales are what's driving this 'revolution', so if the two stroke does disappear we have no one to blame but ourselves. See, there is an exemption to the EPA/CARB rules for closed course use only machines. So race bikes don't have to be compliant. So, to answer your question, I prefer the 2 stroke. More nimble, less rotating mass, easier and less maintaince, cheaper to rebuild. I've got two of those thumping 'diesel' pigs and will not have another. 4 stroke is cleaner but don't you get more torque from a 2 stroke? It all depends on what you want. I would go with the 4 stroke for environments sake. Ripping up dirt? = Two cycle. Dependable back country riding? = Four cycle. Pretty much depends what you're going to do with it. Both would be a good choice for any riding. One thing you will find is 2 strokes require more mantenance and a overhaul every once an a while. while 4 stroke requires little maintanance and will last a long time on the original parts. 4 stroke would be better. quiet, lower maintnances, never mix oil, etc. Let me put it this way, soon you won't even have the option of buying a 2 stroke dirt bike. There is probably only a couple pro-racers who still ride 2 strokes and most of the Japanese companies won't be producing them after 2007/2008. 2 strokes are more polluting, loud and labor intensive to maintain then 4 stroke engines. different strokes for different folks as the saying goes! |
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