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4 stroke vs 2 smoker

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Ok so I'm stuck with wich one to get I always wanted a yz250 but I want to do enduros and technical trails but not sure what to get people say a yz250f or yz450f can't decide. So if I was to get a yzf which is better I am 5"8 and 210lb and getting taller I am pretty good on mechanical stuff so doing a topend is not a problem I would just like to know which one will go longer on a topend and how to prevent one from BLOWING UP that is the issue I am worrying about I love four strokes but a blown motor want fit my budget. Any advise is really appreciated. Thanks oh and I'm a trail rider Not a racer

Edited by steelapper

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Most dirtbikes dont blow there engines 2 or 4 stroke, unless your really abusing them.

If your just messing around in the trails i would get a 4 stroke since you said you love them. since your 210 lbs and growing a 450 might not be bad to look into, unless your doing tight technical trails which doesnt need all that power.

I would get a yzf just cause everything is pretty much going to 4 strokes these days, and a 450 if you need that power and a 250 if your in 3rd gear trails 

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Thanks so do you know if the topend in a 450f last longer than a 250f I always heard talk about this but wasn't sure

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Of course the engine lasts longer on a 450F, they turn fewer rpms and aren't nearly as highly stressed.

 

When pushed hard, a 250F doesn't last any longer than a 250T.

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Also how long will the top end on a 450f last if just slow trail riding and how long will the bottom end last I know I can rebuild the top end of a 450f but not sure about the bottom end.

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Also how long will the top end on a 450f last if just slow trail riding and how long will the bottom end last I know I can rebuild the top end of a 450f but not sure about the bottom end.

 

 

There's no magical interval for how long they will last, too many variables. How good is the maintenance, what kinds of loads/rpms does the engine see on average, etc.

 

A 450F, when properly cared for, will outlast a 250F or any two-stroke other than a 500.

 

Just as an example, at 9000 rpm, the piston speed of a 250T is almost 4300 feet/minute. A 450F at 9000 rpm has piston speeds in the 3700 feet/minute range.

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Thanks that's really helpful I think I'm going to look around for a yz450f I do a lot of trail riding so I want need all the POWER but when I hit a open field it's there when I need it. I was kind of worried about the cost of the rebuilds but I know if I do my maintenance I shouldn't have a problem is the yz450f the only reliable bike out there or can someone mention another good 450f out there il be buying used also

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