DT125R ARCHIVE

2strokemx · Guru

RE: should i swap?

Calum122 · Guru

It's really really clever.

There are two power cycles. One petroleum and the second injects water.

This also means there is no need for coolant.

2strokemx · Guru

Why is this the first i've heard of it if its so good? Or is it not very good, just very cleverly engineered

Calum122 · Guru

Just so very clever.

Luke · Guru

Dt Danny wrote:
im going for the 426, might go for the 450 not sure yet, some people told me go for the 250 instead because i wont use all the power of a 450. is that right ?

How many people have litre bikes and 6 fiddy's when they won't "use all the power"? A lot. It's power there for fun! Go for the 450. 250's are pants. That's like saying "Why get a bigger CC bike, your 125CC will do a maximum of 70MPH" my response to that is silence followed by never speaking to them again. Hah

-- Edited by Luke on Wednesday 11th of June 2014 10:16:01 PM

Liam12 · DTR Legend

2strokemx wrote:
Look at any proffesional racers in mx or supermoto... All use 4strokes, must be a reason for that

A yz 125 is nowhere near powerful enough to race and be competative at events, but considering your (anyone) a beginner and haven't got the bike practically side ways in the corners then it doesn't really matter what you ride

2strokes are fun and can be very fast, but when it gets serious and you want to be winning events, 4stroke comes in and gets the job done

It all depends on the rider! My old coach used to show 450's up on a 125 when racing pro!! I've shown my share of 250f's-450f's up on a 125 it's all about how far your willing to push yourself and your machine! At the end of the day if your riding a 4 banger round and are basically just in 3rd and 4th gear and not really pushing it you'll have a 125 show you up! I've had 450's on my tail all day at a track and the only times he would of caught up is in the corners and thats from where the 125 bogs and you have to clutch it, the day I crashed the 125 I was throwing the 125 into corners in 3rd gesr and launching out of the corner with speed! 250f's had to push it to try catch me! Mate of mine was on a 2012 250f and I was on a 03 kx125 and I was showing him up! A 125 will do just as good as 250-450 you've just gotta have the balls to take it that far!

2strokemx · Guru

Yes, at the local tracks and even in the pro's racing two strokes are used, but im talking the fastest riders in the world... Look at ama, or mxgp and when you reach that certain level two strokes just aren't powerfull enough/easy enough to go fast with, but on the lower pro levels you can have the odd two stroke rippin and being very competitive

Im not trying to say 2strokes aren't fast, they feckin are, just if the top pro's favour the 4strokes there must be very good reason, i that i think is just because of the way the 4stroke functions

Atm im looking to get a 250rm two stroke!!

Calum122 · Guru

No two strokes got banned from that sort of racing.

Watch 'Unrideables The Rainy Days' Shows the true skill needed to ride a big cc 2 stroke and how they absolutely smashed the track in terms of fastest speeds and lap times. very good documentary/.

Nathlaad · DTR Legend

DRZ makes anywhere between 30-36 stock. IIRC the E model was closer to 40 & lighter. I agree 4 strokes are better all round the pickup from the torque is just that much better for road use. Also racing wise if we are talking SM. 4 stroke wins hands down the pull out of the corners the 2 stroke just cannot compete, only advantage would be the weight and possibly more corner speed and later braking but the overall power of the 4's is too much.

2strokemx · Guru

Even braking speed, the engine helps braking on the 4's, not on 2's

They are banned? How come ken de dyker rode a 2stroke in the mxgp?

Dt Danny · Guru

Have we actually started a 2stroke vs 4 stroke argument lol

2strokemx · Guru

Ha yeh sorry mate, ruined your thread abit

Calum122 · Guru

I was thinking general racing. They don't even support 125 2 stroke GP which was by far the best.

Not necessarily though. There are a lot of fourstrokes that have compensated bottom end for much more savage top end.

A two stroke can be ported in such a way that it's got a lot of mid range. A lot of 2 strokes are really really peaky. But you think about 2 stroke go carts used in cadeates racing. They have no gears and need power throughout the rev range. They use two stroke engines right the way up from beginners to finish.

Don't get me wrong. I bible bash two strokes yes. But I flipping love 4 strokes. They're so clever and amazing. But I prefer my motorbikes to be two stroke and my cars to be 4. Reliability doesn't come into the equation for me and bikes. It does for a car lol!

Either way I wouldn't mind having a go on a 4 banger mxer. That video you did looked pretty awesome.

sebamax2 · Guru

Calum122 wrote:
Haha. I'd love to hear how you came to that conclusion about 4 strokes being better than a two stroke. Speaking from someone who has a supermoto road legal mx bike in their garage and have ridden it I struggle to see where you're coming from.

The yz's power is savage yes but smooth delivery. The powervalve system is mechanical and doesn't operate in the same way as the YPVS. I'm sure more appropriate sprockets would further enhance this.

There is the fact that 2 strokes are lighter than 4 strokes and that in itself contributes massively to the handling.

Then there is the obvious one that two strokes simply put out more power and therefore on paper it's better.

Ultimately it's down to the rider. My brother can be on my dt and I'm on the yz and he'll beat me simply to being a better rider.

well my husky weights only 118kg so wnt agree with 2 strokes being lighter , well most probably are lighter than other 4 strokes but not all

sebamax2 · Guru

also another thing, wr 5 gears only, would that be enough for motorways?

Calum122 · Guru

Wow that's light! Are you sure?

Two stroke engines are lighter. There is no denying that. Simply the number of parts they require make that so.

But that's impressive weight for a bike of that cc. That's lighter than a dt125! Almost as light as the Aprilia RS125.

sebamax2 · Guru

yes acording to mcn and bikez. im not too sure now i did the vin decoder thing and it came up as 2003 wr 450 not 2005

Calum122 · Guru

That's an impressive weight. But that's not down to the lump.

sebamax2 · Guru

light chassis . the wr450 weights 122 kg aswell so still lighter than a dtr :D

sebamax2 · Guru

but i cannot imagine the engines being heavy, my bottom end its preatty much as big as dts bottom end, DT could shave off few kilos with the tank and swing arm, plus dtr steel rims are heavy aswell comparing to full aluminium excels

2strokemx · Guru

Apparently they have the technoligy to make 2stroke bikes fuel injected and less emmisions so they are putting the same out as the 4strokes

Did you mean my video cal? I think you will feel allot more comfortable and confident on a 4stroke mx'er

Calum122 · Guru

Yeah your video. Looks very smooth when you were doing it

2strokemx · Guru

Yeh there's no sudden surge like the 2strokes, cal have a go on a 250f, you have full control over the throttle all the time, it never catches you out, and you can yank the throttle back and get away with it unlike the 450's

CarlosRexx · Guru

Calum122 wrote:
Don't do it. These bikes cost a fortune to rebuild. If you're going to buy a bike like that make sure it has as much history as possible.

I got a full engine rebuild for just shy of 400 quid including a new valve kit! That was from Elderfield motorcycles too!