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-   -   Dakar: KTM great but why not 2-strokes? (http://www.advrider.com/forums/showthread.php?t=858840)

SnakeBreak 01-27-2013 02:55 PM

Dakar: KTM great but why not 2-strokes?
 
So I watch as much of Dakar as I could and the top riders are riding KTM 450's. Why not 2-smokes? Why 300exc is way simpler to fix and has less to go wrong? In the USA I would say it is rules against 2-strokes on the road, but down there?

STisma 01-27-2013 03:22 PM

I think it has to do with the torque.

Katoom72 01-27-2013 03:23 PM

Long stretches of WFO and 2stroke don't go well togeather.

SnakeBreak 01-27-2013 04:08 PM

Quote:

Originally Posted by Katoom72 (Post 20588438)
Long stretches of WFO and 2stroke don't go well togeather.

Why is that? I am sure you right but I do not understand why. It seems a 2-stroke 400 or 600 would make massive power /weight and you would not have to run WOT. They put 2-strokes in boats and they run WOT all the time.

Racer111v 01-27-2013 04:35 PM

Baja has been won many times by 2Ts. It doesn't get much more wide open than that. But the manufactures want to sell 450 4Ts, so guess what they race.

crofrog 01-27-2013 05:58 PM

Quote:

Originally Posted by Katoom72 (Post 20588438)
Long stretches of WFO and 2stroke don't go well togeather.

when they aren't jetted right...

but 2 strokes seriously suck gas which would add allot of weight for a dakar bike.

Brokein2 01-27-2013 06:02 PM

I don't know about you, but I would not want to try and figure out proper race jetting for a day that has a 3000 meter elevation change. Maybe fuel injected 2 strokes would be ok....

WARRIORPRINCEJJ 01-27-2013 06:03 PM

Luis!!!


http://i929.photobucket.com/albums/a...EJJ/JM0752.jpg

crofrog 01-27-2013 06:05 PM

Quote:

Originally Posted by Katoom72 (Post 20588438)
Long stretches of WFO and 2stroke don't go well togeather.

Quote:

Originally Posted by Brokein2 (Post 20589634)
I don't know about you, but I would not want to try and figure out proper race jetting for a day that has a 3000 meter elevation change. Maybe fuel injected 2 strokes would be ok....

not really that different the carbed 4 strokes though.

FI brings it's own problems ask HRC

tHEtREV 01-27-2013 08:29 PM

Fuel consumption.

Any weight saving from a two stroke is taken up by the extra fuel it would have to carry.

My 200 used to use 10l per 100k on gravel roads taking it easy, my 4 strokes use between 5 and 6 liters per 100k.

Considering 30l was not enough for an FI 450 ridden by a front runner, how much fuel would you need for a 300 2t?

Yellow Pig 01-28-2013 07:11 AM

Plus the oil you have to carry for refueling

snarf 01-28-2013 07:50 AM

Quote:

Originally Posted by Katoom72 (Post 20588438)
Long stretches of WFO and 2stroke don't go well togeather.


Sure they do. 500s used to rule the desert for years and years.

snarf 01-28-2013 07:55 AM

Quote:

Originally Posted by Yellow Pig (Post 20592626)
Plus the oil you have to carry for refueling

Most of the time, guys allready mix the premix in, before they take the fuel to the fuel stops.

2T uses more fuel than a 4T?

If its not jetted right, sure they do. My 300 sips gas, why? Because its jetted right, lol.. I get 35+ mpg out of it just tooling around, and about 30 at race pace.

Manufacturers DONT WANT to race the 2T's, otherwise they would. Thats why.

crofrog 01-28-2013 11:04 AM

Either your bike is dangerously lean or your idea of race pace and mine don't line up at all. I get about 20 out of my 200 during race. Jetted for max power clean plugs and no spooge.

toro618 01-28-2013 12:25 PM

Quote:

Originally Posted by crofrog (Post 20594208)
Either your bike is dangerously lean or your idea of race pace and mine don't line up at all. I get about 20 out of my 200 during race. Jetted for max power clean plugs and no spooge.


Sorry to hijack, but how do you avoid no spooge? I always thought even if jetted perfectly, the motor will not burn 100% of the 2T oil.


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