General > In General...
The end is here...
Rick:
Yup, when it's time to fix the 4-stroke, you better have a tidy sum in the bank.
Quite a number of folks in the regional offroad series jumped to the 4-stroke when they hit the market. This year, more than half are back on the 2-stroke. Hmmm, kinda makes you think....
I'll just keep big green as long as I can keep getting parts...
Rick
kawdude:
I love the 2 strokes as much as anyone but I will be very surprised if they stay around. I think it's a losing battle. The EPA doesn't care about maintenance costs. It's the end user. It's what they do. If given the choice would they give up riding because only 4 strokes exist or switch to the 4 stroke. The future could bring better efriendly 2 strokes or better 4 strokes but my bet is on the 4 stroke. Look at the anti-gun groups they are destroying that sport.
One of the above topics mention higher maintenance costs which brings up a question I've been meaning to ask. I would agree that the XR is a dependable machine. With that in mind why are the other newer 4 strokers less dependable or more prone to failure. Is it because of the rpm range the newer ones can rev to? If I owned a yz450f or crf450 and just lazily cruised around wouldn't you expect them to last like the xr's. I would expect them to last way longer than the 2strokes if you don't ring the engine out all the time. What am I missing here?
Paul:
It because they weigh so little, ANYTIME you give up weight - in an engine environment - you are losing strength. Titanium, while light, becomes brittle the more times it is heat cycled as do most other metal that are being used in thumpers, also the internal weigh more that 2 stroke internal and have more internal friction, these are forces the engine must fight to produce power. Over coming these forces causes fatigue in these seriously weak parts. Ever wonder why the 2 stroke manual mentions topends every 25 - 30 hours and the thumper ones suggests 10 hours ? Atleast the CRF one I saw did.
gowen:
I used to have a YZ426 and it did not lug very well, it would stall, overheat and would NEVER start when hot and the compression is twice as bad as a kx500. When I dropped it, I would just walk away and let it cool down, as it would not start. My buddy has a new yz450 and it is just as bad. They are NOTHING like the xr's. I had a xr600r for awhile and it was nothing like the new 4 strokes. Unfortunately. Nothing is going to take the place of a 2 stroke.
Rick:
Wow, a top end every 10 hours!!!! On a 4-stoke!!! That would mean I would be putting a piston in every week after my weekend riding. Yuk!
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