Two-strokes set to continue at MX Nationals in 2015 (not VMX)

[cr4ever]

http://motocrossactionmag.com/news/new-rule-250-two-strokes-are-too-fast-for-250-four-strokes

Read what they have to say in  the USA....interesting!

[KTM47]

How great is that!!!!!

We just need a 400cc 2 stroke now to flog those noisy, smelly, expensive 450 4 strokes

Bring back the 2 strokes!!!!!!!![/b]

[bishboy]

If I read the rules right, and I must admit it was only a quick read, in MX1 there is nothing stopping you riding a 255cc or larger two stroke. 

So you could put a 500cc two stroke engine in a 450f frame and race against the 450 four strokes?

Is this right or did I not read far enough down the page??

[80-85 husky]

a kato 300 will sort a 450 out so whats the issue??

[evo550]

If I read the rules right, and I must admit it was only a quick read, in MX1 there is nothing stopping you riding a 255cc or larger two stroke. 

So you could put a 500cc two stroke engine in a 450f frame and race against the 450 four strokes?

Is this right or did I not read far enough down the page??

You read right...

[Nathan S]

I'd love to see a 300 2T up with the 450Fs, but its not gonna happen with any useful regularity.

Apart from modern 450Fs being faster and easier to ride across the average of all possible conditions, the manufacturers are paying the best riders to ride 4-strokes - so the top tier riders are already on 4Ts. The only time you'll see a 2T up there is if you had a talented up-and-comer on a properly sorted bike, and the conditions were just right - it would be awesome to see, but its not going to be a long term, sustainable thing.

[80-85 husky]

i think that's the way of it Nathan, the big four have gone green with 4 banger push from the 1990's and not much will bring them back other than real smack in the face sales figures. kato and husky etc with their 2 bangers have that sown up....

[Momus]

I saw young Joel Milosevic on his TM300 hand it to a lot of 450 4 strokes at the MX Nationals round in Swan Hill in June.
Came 9th for the day.

He qualified 4th at Raymond Terrace the next round and came in 10th overall.

I predict a 2 stroke will win the 250 MX National Championship next year.

[KTM47]

If I read the rules right, and I must admit it was only a quick read, in MX1 there is nothing stopping you riding a 255cc or larger two stroke. 

So you could put a 500cc two stroke engine in a 450f frame and race against the 450 four strokes?

Is this right or did I not read far enough down the page??

No you read it wrong.  The upper limit in the Aust MX & SX Championships  450cc.  So a 500cc 2 stroke is too big and anyway the last of the 500cc 2 strokes were too powerful.  The last 2 stroke to win a 500cc World Championship was a 360 KTM.  So something around 400cc would work.

[evo550]

i think that's the way of it Nathan, the big four have gone green with 4 banger push from the 1990's and not much will bring them back other than real smack in the face sales figures. kato and husky etc with their 2 bangers have that sown up....

The manufacturers would like us to think the 4 t push is for the enviroment, but it's B.S.
The real reason is the spare parts gravy train and regular( annual or bi annual) bike up grades required for the four stroke racer.

[evo550]

If I read the rules right, and I must admit it was only a quick read, in MX1 there is nothing stopping you riding a 255cc or larger two stroke. 

So you could put a 500cc two stroke engine in a 450f frame and race against the 450 four strokes?

Is this right or did I not read far enough down the page??

No you read it wrong.  The upper limit in the Aust MX & SX Championships  450cc.  So a 500cc 2 stroke is too big and anyway the last of the 500cc 2 strokes were too powerful.  The last 2 stroke to win a 500cc World Championship was a 360 KTM.  So something around 400cc would work.

Reads MX1 class 255cc and over, no limit.
SX1 has 450 limit

[Lozza]

Problem with big bore 2T engine is the bigger the bore gets(compared to stroke) the less efficient the cylinder gets where a 4T with a big bore and short stroke will have a lot of valve area and breathe very well. Same as a 125cc 4T would never compete with a 54 x 54.5mm 2T 125cc.

[KTM47]

If I read the rules right, and I must admit it was only a quick read, in MX1 there is nothing stopping you riding a 255cc or larger two stroke. 

So you could put a 500cc two stroke engine in a 450f frame and race against the 450 four strokes?

Is this right or did I not read far enough down the page??

No you read it wrong.  The upper limit in the Aust MX & SX Championships  450cc.  So a 500cc 2 stroke is too big and anyway the last of the 500cc 2 strokes were too powerful.  The last 2 stroke to win a 500cc World Championship was a 360 KTM.  So something around 400cc would work.

Reads MX1 class 255cc and over, no limit.
SX1 has 450 limit

Yes you are right.  So it is another rule they have changed.  450 was the upper limit in 2013.

Anyway with the tracks today a 500  stroke would be too much.  Maybe on a sand track with the right rider.

[FourstrokeForever]

i think that's the way of it Nathan, the big four have gone green with 4 banger push from the 1990's and not much will bring them back other than real smack in the face sales figures. kato and husky etc with their 2 bangers have that sown up....

The manufacturers would like us to think the 4 t push is for the enviroment, but it's B.S.
The real reason is the spare parts gravy train and regular( annual or bi annual) bike up grades required for the four stroke racer.

^^^^^^^That's about the sum of it in one post^^^^^^

[Davey Crocket]

Talking to a few people who's kids ride the 250 4 bombs hard is when they get to 50 hours sell them and buy a new one. Yamaha recommends a timing chain replacement every 10 hours on there 4 bombs. The "green " aspect of 4 bombs does not exist as they have no emission control type devices to limit there pollution to the environment. We even got a new pollutant in motocross thanks to them.....NOISE. And that one is what is causing the most damage to our sport. Where's the manufacturers responsibility here? Darryll King won the NZ 250 championship a couple of years ago on a Yamaha YZ 2 T.....smoked all the kiddies.