canyncarvr said:Ridden one?
I have.
Comparing the two is pretty much an apple'n-oranges deal.
The suspension is delightful. That's a fact. It's very narrow...much slimmer than the tank-heavy kdx.
It doesn't have the 'hit' that a 2-smoker is used to. Yeah...what 4-stroke does?
That completes the chain of events for the basic two-stroke cycle. The discussion is not complete. The animated demonstration has an added device commonly known as an expansion chamber attached to the exhaust port. The expansion chamber (an improperly named device) utilizes sonic energy contained in the initial sharp pulse of exhaust gas exiting the cylinder to supercharge the cylinder with fresh mixture. This device is also known as a tuned exhaust.
"supercharging" means supplying to the working space, e.g. cylinder, combustion-air pressurised by means of a pressure source, e.g. a pump.
COMBUSTION ENGINES (cyclically operating valves therefor, lubricating, exhausting, or silencing engines
canyncarvr said:Ever see a 4-stroke with diverging/converging cones on the pipe?
rv6junkie said:I'm interested in hearing how well the 250X stands-up over time. More specifically, I know that my KDX will get 100 hours out of a top end, but what's the longevity of a high strung 4-stroke?
Crispie0 said:RV6Junkie - what do you have on your bike that you didn't pass the sound test? What decibals did the test read?
Just curious, I'm going to a race this weekend and might need to bring along spare parts. Thanks!
Rich Rohrich said:The suggested service interval is in the 15 hour range for the piston and rings. We just did a 250R with about 5 months/60 hours of regular hard riding on it. The piston ring (there is only one) was blowing by like crazy and the valve seat was hammered to twice the service interval limit. So far the Honda 450s don't appear to be throwing parts through the motor when you stretch the intervals, but the 250R/X is still pretty much of an unknown in this area.
They do get really SLOW and sluggish when the rings wear, so it's easy to know it's TIME.
An hour meter is a wise investment on these bikes.
rv6junkie said:That's good info Rich. I ride my woods bike (KDX) about 25 to 50 hours per year, so you can see how expensive a four stoke could get. Of course, if I had a new woods bike, I'd ride it closer to 50 hours! I'm hoping to see a service interval in the 25 hour range.
It's not the short service intervals that bother me. My KX125 is a 25-hour topend bike. But I can change the piston and rings on a friday night for a minimum expense. I'd have to get some training to service the 4-stroke.
Rich Rohrich said:But if you think about it, a water cooled power-valve equipped 125 seems like a bear to work on when compared to an old air-cooled Elsinore. ;)
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