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Mr. Know It All

CRF250 DONE BLOWED UP ON ME

BOOM!

By Rondo Talbot

 

Hey Mr. Know It All

I got a question for you that will probably stop you in your tracks. I bought a Honda CRF 250F 2009 model a few months ago.  The guy the guy I bought it from did a complete rebuild on it and showed me all the receipts, he said he forgot to put the right oil in and that's what smoked the motor, so I started with a good fresh motor.  He said it only had maybe 15 hours on it …… all trail riding and no racing hours. Well here's what's happened to me. I only had maybe six hours on the bike.  I was riding with my buddies at the local sand dunes and my bike started running really really crappy. I figured it might have been a bad plug or maybe some water in the float bowl since I washed the bike at the car wash a few days ago. Nope nothing there. So I figured I just run it a little harder and clean it out. Well I ran it about another 20 min. or so and the bike just quit running completely and I can't even move the kick starter not even an inch. Now I know that everything is fresh in the motor cause I got all the receipts, but what would make the bike do what it did? I can't afford to take the bike into the shop because they charge $85 an hour just to look at stuff so I figure maybe you're the cheaper way to go if you're really Mr. know it all.

Danny

LA California

 

Danny,

Hey is something horses eat, and is no way to address someone in the “to” portion of a correspondence. Mr. Know It All, Rondo Talbot, or Sir is acceptable. Also, there are things called "paragraphs" that we use in conveying thoughts to each other in the written word. But back to your CRF: 

Unfortunately Danny you got took like Grant took Richmond, i.e. that is to say you got suckered into purchasing one of the most explosive topics in the dirt bike world, a four stroke two fifty cc MX bike. Since these new wonder machines turn around 13,000 rpm to make half the horsepower of a comparable two fifty two cycle machine, all the parts inside that fragile little four striker have to be made light enough to allow the motor to “spool up” with some degree of alacrity, to mimic the power of a two-stroke.

Now this might be all fine and good for about ten hours of hard riding, but after that, things start to go south in a hurry. Pistons that weight about the same amount as a medium bag of salted peanuts develop cracks along the wrist pin boss, and skirt. Under designed small and big end bearings, along with connecting rods that would be overtaxed on a lawnmower start to “give way”. Light weight valve assemblies and keepers start to deform, the valve drops into the cylinder assembly, and causes things to come to a sudden and very expensive stop.

So Danny, what has happened, is your dirt bike is dead, gone, passed away, shot. This is no fault of yours, as in normal times an off-road motorcycle lasted for years, with decent maintenance, before something broke. But in this new age of environmental tolerance that forced the big motorcycle companies into building four-stroke machinery that could compete with a two stroke, this is what you get; a fast, complicated works-type dirt bike with a short fuse. After about ten hours of hard riding, you need to totally rebuild the motor, or it goes off like a trick cigar.

What we here at superhunky.com suggest is you go out and find a decent used 250cc two stroke. At their peak the 250 two cycle MX machine was the picture of horsepower, handling and reliability. They can still be found for relative peanuts, and you can pick one up for about the same amount that an engine rebuild would cost on your CRF.

And yes, you really should have known.

Cheers,

Rondo