2stroke dirt bike?

[dawgkllr]

That is a very hot bike. Quite the jump from his TTR 125. What you have heard on the top end is more applicable to the 4 stroke bikes.


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True words! They’re a handful.


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[dawgkllr]

2 strokes rule!




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[KyleW]

That’s a lot of bike for a kid used to riding a 125 4 stroke in my opinion..

But they are a blast to ride. Once he gets used to it he’ll never need anything else

[KGreene]

2 strokes rule!




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Very nice herd! Do you ride the vintage series here ? I have a few friends who do. My daughter just rode the 24 hour Gutbuster race in Bridgeport this last weekend on one of her two strokes.

[RifleBowPistol]

There really is not anything to rebuild in the top end of a two stroke. The only moving parts are the crank, rod and piston. That's all bottom end.

Two strokes are very simple, but can be difficult for some people to figure out some problems. You have to keep the crank case sealed up good, change the reed valves on a regular basis and make sure you always put good fuel, in them with the proper mix of oil.

They are a blast to ride, but going from a TTR125 to a YZ250, is going to be a pretty decent jump in bike. If you wind up with a modified YZ250, it will likely be a huge jump in bike. If I were you, I would find a bike very similar to what he wants or the bike he wants and see if the owner will let him ride it first. If it's a modified bike that has been raced, it's going to be a serious rocket compared to what he has been on.

Like others have said, four strokes the power comes on linear, basically light throttle, the bike accelerates slower, more throttle it accelerates faster, more throttle more go.

Two strokes typically stutter at low rpms, low throttle, then there is a point, you give them enough throttle, they start to clear up and run fairly quick, if the bike is not seriously modified. Then a little more throttle and then it gets into it's power band and rips, then from that point on, the rear tire, is usually spinning hard. The more seriously modified race bikes, pretty much completely skip that small window where the bike goes from stuttering, to clearing up and accelerating at a decent rate, and just go straight from stuttering to ripping along. But they are a blast and can be very fast.

I would probably still start him off with a 125cc two stroke, those can be seriously worked over. My nephew's YZ125 is pretty dang fast. The 125s are a little lighter bike than a 250. My nephew that was racing the YZ125, was probably 5'9 to 6' tall, when he was racing it. I don't know how many years he raced that bike, I would bet at least five years. He did pretty good on that bike, till he wrecked it one time, he got hurt pretty good. I think that kind of scared him some. He cut back on riding after that incident. But that was also about the same time he went off to school in Houston, then went out in the real world and started working for a living. I don't think he rode much after he had that one wreck.

Recently his younger brother got a brand new CRF250. It's still bone stock, it's slooooowwww. But it's a good bike for him to learn on. He's pretty pumped up about riding the bike. He is a bit timid, but he seems to be getting a lot of time on that bike. So I would think he would have a lot more confidence by this point. I would like to get another CR250R and go riding with him. I would finally have someone to ride with. Multiple years, when the older nephew was riding, I was recovering from my last dirt bike accident.

A 250cc two stroke can be modified, into a serious beast. I have talked to guys in recent years, with CR250Rs, that were making around 107 hp, I am pretty sure that was at the rear tire. My buddy's 636, put down 109 hp to the rear wheel, after a pipe, race filter, and a tune. That's about a 450 lb. bike. A 250cc, two stroke dirt bike probably weighs 200 lbs. So it's possible to make right around the same hp as a fast street bike, with half the weight. Then you are riding it in the dirt. That's near the top of 250cc two stroke ladder. Most of them are probably only 40 to 60 hp. I have never dynoed a two stroke bike, so I really don't know. I think the last time I looked at a Honda brochure, many years ago, I think the CR250R made 50 something hp stock. Those would be crank hp numbers, so the numbers at the rear tire are going to be a bit less.

Basics of what I am trying to say, is a completely stock, bike, is going to be a lot tamer and easier to ride, but still can bite you pretty easily. Most used bikes are going to be modified to some degree. Then if the guy who did the mods, really did not know what he was doing, the mods, likely are not increasing the power that much. Once the bike is properly tuned, it will likely wake up a lot. But if the bike is built by someone who really knows what they are doing, even a mild build, is probably going to be a rocket.

I love two strokes, I really love riding them, when I have a good place to ride, where I can really enjoy the bike. I have tried riding them in places or times I should not have, got bit or came close to getting bit a few times. I love to see other guys racing and riding two strokes. I will admit that the four stroke bikes are a lot easier to ride in numerous situations.


I would really suggest him riding the bike he wants or one very close, before buying one. Just to make sure he is ready. He may be ready for one, but it will be a good bit of a step up. I went from riding some old enduro, to jumping on my uncle's CR250R. Then later bought that bike off of him, then sold that bike, when I realized it had a lot of problems. It needed a new crankcase, radiator, water pump, and a bunch of other stuff. The bike ran strong, just leaked water from everywhere. So I sold it, then bought another CR250R. I blew up the clutch basket in that one. They could not believe I did that with a dirt bike. Rode that one, till I had no place to ride, then sold it. Then years later bought a third CR250R, rode that one, till my last accident. I plan on buying another CR250R and then get a CR500R. I have wanted to ride one of those most of my life, never been on one. It's very possible to go from a trail bike, to a 250cc two stroke.

The main things are that he have fun and hopefully not get hurt too bad. If you ride hard, you are going to wreck, just a given. Hopefully you have a lot of fun between the wipeouts.

[Hart8]

KTM makes a 150 2 stroke that is a bad dude!

[coy-ote]

Guys thanks for all the input and he had ridden his buddy’s yz125 2 stroke and liked it but thinks he’ll out grow it and then have to buy a bigger bike to take to the track and ride on our place. I ride and have ridden since I was 14 and I’m now 58 , I was a motorcycle officer for the last 9 years of my 30 in law enforcement. But I don’t know much about dirt bikes other than 2 strokes have always been known as beasts!

[JayB]

My opinion...125 is harder to ride than 250.
Here's why: 125 2 stroke is designed to be risen at the top of the the power band. That means higher rpm to get the best power/control. On a 250, there is more bottom end available so you don't have to ride at the highest rpm. If he already understands throttle control, having more power available to get out of a bind is a safer ride.

When my son was 15, he had never riden and the 250 was an easy learner. When I was young I rode 125 so knew what was needed to ride the older bikes.

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