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From reading all these replies , these 250F's seem to hold up quite a bit longer than what I was thinking. Btw I have ridden a few in the past couple years and I liked them. I think my corner speed was actually faster on the 250 compared to the 450 for some reason. But totally remember them not having any where near the power of my 450. But then again , neither does my RM 250 as far as that goes.
The Shop
JK
or we can work out a twofer at motosport and Ill pick up the 15 450.... the wife would kill me
Biggest factor here and it relates to the way you ride your motorcycle.
Are you a Barcia (Top End &Then Some)
Or are you a CP377/KR/JS7 All Bottom To Lower Mid Using Momentum type of Rider?
I replaced pistons simply for piece of mind, not wanting the motor to lock up. You also will notice a power increase with a new piston every 50 or so hours. A stock 250F motor that is well taken care of is not a time bomb like some think.
@Osaka......Well I'm kind of a weird rider to be honest. When I'm out of riding shape and don't feel confident , I ride a LOT slower. Been hurt so many times that I'm just not willing to cross any lines. When I'm in good riding shape and my confidence is really good , I tend to ride a lot more aggressive and a lot faster. The throttle position all depends on how I'm feeling. I know with switching to a 250F I'll have to ride a lot more aggressive. Which is what I'm lacking right now. Because riding my 450 super aggressive , one slight mistake and I'm toast ( again ).
I really do believe that 450's have made me lazy. Hard to explain here , but when I jumped on my RM250 2 stroke , it flashed me back to about 15yrs ago , but in a good way? Like I was craving that extra skill it took to make it go faster. And when I got tired , it wasn't so scary to get out of shape on. Don't get me wrong , I love my 450 , but only up to about the 8 -10min mark. After that I get a little worn and that seems to be where I always make my mistakes.
I know how to ride a bike. Spent many years in the INT classes and the +25 and +30A classes. It's not that I don't know how to , or forgot how to ride , it's that I don't have time in my life to get in the kind of shape I " want " to be in , to ride that 450 the way I know how too. It's very , very seldom when I actually feel good enough on my 450 , where I'll actually push it. I can't even start to push that thing to it's potential , but a 250 I can at least man handle it the way I want , without it trying to kill me.
I'm going by an old rule I heard about 30yrs ago. And that it's a lot more fun to push a slower bike to go fast , then it is to ride a really fast bike slow. I've at least gotta give it a shot.
i havent really ridden a 450mx bike on a track but ive been riding 250 2-strokes for awhile and can only imagine a 450 is alot easier to ride...
i know they're heavier but maybe you could try changing your technique ...?
And I have an 06' RM250 as well. I can ride it more aggressive than my 450 and still put in longer rides with it. The extra weight , power and overall feeling of the 450 is what seems to be wearing me out lately. So what the hell , I'll give it a shot.
Stay off the rev limiter. The ability to upshift is there for a reason.
Change ur oil every 20 hrs.
Check the piston out every 150 hrs.
Bike will last forever.
Pit Row
Couple questions though.
Change ur oil every 20 hrs.?
Check the piston out every 150 hrs.?
Those seem to be extremely excessive there. Or lack of actually. I change my oil every 3hrs or so. And lot of guys in here have said check the piston between about every 30-50hrs or so. Every 150hrs seems insane to me. Even on a well maintained 450 that seems a little crazy.
3 hrs is hyper excessive. Though, Im sure Lucus Oil & Maxima love u guys for it.
I tried to edit my post to say check the valve train every 150 hrs, and give the piston a look. Odds are the piston wont need changing.
The only reason mfg's tell the consumer to change the oil so frequently is a precaution to avoid warranty issues. During the actual R&D process, you'd be very surprised to know how long a box stock engine will last without having the oil changed before it blows up.
My advice? Zracer is right. Get a 350. It's the best of all worlds. Just a ton of fun. The power delivery and curve is perfect. I change my oil/filter every 25-30 hrs. I got 2700miles on it. No issues at all. I honestly think I could go 50 hrs and have no issue.
Granted, I cant speak for everyone else. A lot of this depends on how you bike but then again, during endurance testing mfg's have seen good results with even a pro on the bike.
My advice is if ur afraid of upshifting and want to be reving the crap out of your thumper all the time or ride the clutch constantly (which makes no sense considering the torque 4strokes have compared to 2strokes), then you might want to change the oil more frequently. Also, if you dont let the piston heat up, these racing thumpers have a tendency to allow blow by which further breaks down your oil. And like I said, dont sit on the starting line rev'ing the crap out of your bike. It's really hard on the valve train and it's just overheating ur bike. We all have EFI now, free rev'ing isnt necessary.
What an idiot.
Post a reply to: All 250F owners , how the longevity?