Ol'89r said:One of our members asked me to check the maintenance schedule for my CR250 against the maintenance schedule for my CRF450. So I did.
CR250
Rings and piston. Replace every 7.5 hrs or 3 races.
These are the intervals suggested by the folks that built the bike. Your (anyone's) desire to follow the schedule or not is entirely up to you. You decide what YOU think is a good interval and then live with the associated costs :)I wouldn't agree that all of this info is "factual" Do you actually follow those schedules?
Exactly.I have neither the time nor energy to mess with a four-stroke top end, so I know I have no business owning one. I think some folks are finding this out the hard (expensive) way.
pace said:Y
I'll do my own two-stroke rebuild. I have neither the time nor energy to mess with a four-stroke top end, so I know I have no business owning one. I think some folks are finding this out the hard (expensive) way. :think:
James said:I am curious how a piston in a hotter higher compression engine, with a single ring, and turning about 2k rpm more lasts twice as long? Same with the bottom end? If the CRF trashes clutches in short order, I don't see how it would be any easier on bottom ends and transmissions.
You had me at hello ;)Rich Rohrich said:A four-stroke fires .....lots of techno stuff omitted for purposes of brevity......ever will.
Okiewan said:These are the intervals suggested by the folks that built the bike. Your (anyone's) desire to follow the schedule or not is entirely up to you. You decide what YOU think is a good interval and then live with the associated costs :)
Exactly.
A Ford Foucs requires less maintaience than a F-40. They try to make it (ex; Focus) bullet proof from the factory, knowing full well the average owner will never lift the hood, much less change the oil every 30,000 miles. If you don't have the time to take care of of an Itallian supercar, don't buy it, you'll do much better driving your Ford into the grave.
James said:I wouldn't agree that all of this info is "factual"
Do you actually follow those schedules?
I don't know anybody that rebuilds 8 times a year much less 16.
Oh, the complete Wiseco CR250 top-end rebuild kit is $119 at motosport outlet.
QUOTE]
The FACTS, as Okie pointed out, come directly out of the Honda service manual. These are the recommended factory intervals for the CRF and the CR and used only to compare the two.
The FIGURES come directly from the Service Honda web site and are FULL RETAIL PRICES. These prices were used for comparison purposes only.
No, I don't follow those recommendations on my own bikes. On my CRF, I inspect and measure everything and if it is within factory specs I put it back together. Been doing that for two years now. Other than replacing the rings and piston, the bike still has the original valves, cam, springs, cam chain and bottom end. And Yes, it has been raced. And Yes, I'm old and out of shape but not inexperienced on 2 strokes.
This thread was only meant to point out some of the misinformation on the internet about fourstrokes. Many people seem to think you need to replace everything in the engine, cams, followers, etc, just as standard procedure. This is simply not true. In the service manual they do not state replacement intervals for anything other than the piston, rings and pin. Everything else like cams, followers, valves are inspect and replace as necessary. If service intervals are followed, most of the time it is not necessary to replace these items.
As Rich pointed out there are many reasons why a 4 stroke lasts longer than a 2 stroke. Better oiling system, filtered oil fed by constant pressure instead of oil mist. Full cylinder ring support instead of a cylinder that is full of holes. Cleaner internal operating enviroment. Half the power strokes allowing the engine to run cooler.
Again, this is not meant to bash either 2 strokes or 4 strokes. Just pointing out a few facts and trying to correct some rumors.
Fact is, all the new bikes are awesome. The 2 strokes will be around for a long time and the aftermarket mfg's will be producing parts to keep them running for many years to come. The 4 strokes are just in the beginning of their evolution and will only get lighter, faster and easier to ride.
It is a very exciting time to be involved in the industry.
Just pick a color and go ride. :yeehaw: :yeehaw: :yeehaw:
Ol'89r
marcusgunby said:and if the 4 blowsup , your savings have gone up in smoke.
CaptainObvious said:Get over your lunatic obsession with the past. By the time you come to accept four-strokes they'll be replaced by something else. :blah:
3 gallons per hour???? You might need to change your jets or something.CaptainObvious said:Nice try Ol'89er. Some people will just never believe :bang:
Another thing to consider when you start to nit-pick the cost of ownership as many like to do (I choose not to), Two-stroke fuel costs a lot more. Just the cost of oil alone will add $1 to $3 per gallon, that works out to $3 to $9 (without the SFC in front of me for each engine type, this is a guess) per more an hour for operation. That is $300 to $900 more in operating costs per 100 hours of operation.
Ol'89er said it best when he figured that all of the costs even-out in the end.
It's just so embarrassing how extreme some of the two-stroke riders have become. Get over your lunatic obsession with the past. By the time you come to accept four-strokes they'll be replaced by something else. :blah:
I know for a fact that I don't have to replace my piston every 7.5 hours. Recommendations = guesses in my opinion, not facts.Ol'89r said:The FACTS, as Okie pointed out, come directly out of the Honda service manual. These are the recommended factory intervals for the CRF and the CR and used only to compare the two.
I would agree that those figures are factual, the prices that is.The FIGURES come directly from the Service Honda web site and are FULL RETAIL PRICES. These prices were used for comparison purposes only.
You can bash all you want. Like I said, I ride both. The only thing I am questioning is the "facts". Your information is interesting for sure, but I am not convinced yet. No matter, I have to to get busy obsessing over the past, no time for debates. :)Again, this is not meant to bash either 2 strokes or 4 strokes. Just pointing out a few facts and trying to correct some rumors.
James said:I have been saying for 4 years that I would love to have my old XR400 engine in a CR250 frame because the 4s are easier/more fun to ride (for me).
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