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Dirt Bike Mods & Maintenance
Two stroke VS four stroke. Facts & figures.
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[QUOTE="Ol'89r, post: 891971, member: 17212"] A couple days ago there was the usual discussion going on about which was better, cheaper, etc, etc. I made the statement that the four stroke will last longer that the two stroke between rebuilds, and over a period of time it will even out even though the fourstroke has more parts. 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. Small end bearing and pin. Replace every 22.5 hrs or 6 races. Cost to do a top end rebuild on a CR250, includes rings, piston, pin, clips and all gaskets. = $166.86 Suggested Dealer prices. Not including labor. CRF450 Rings and piston. Replace every 15.0 hrs or 6 races. Pin. Replace every 30 hrs or 12 races. Cost to do a top end on a CRF450, Includes rings, piston,pin, clips and all gaskets.= $170.05 Suggested Dealer prices. Not including labor. Now, if you run 50 races a year and adhere to the recommended maintenance schedule you would have to rebuild the top end on your CR250 a total of 16.6 times at a total cost of $2,769.88 On the CRF450 you would have to rebuild the top end a total of 8.3 times at a total cost of $1,411.17 Taking into consideration you did nothing to the head on the CRF450 and had to replace the entire head, valves, springs and cam, this would cost $840.47. The difference between the CR and the CRF rebuild is $1,358.71. So, even if you had to buy a complete new head for the CRF and a cam you would still be $498.24 to the good on the CRF. In my experience, if you use good oil and check your valve clearance often, the CRF will go much longer than the required maintainance schedule. Perhaps three times as long as the CR or more. But, for this study I used the recommended factory specs. Plus the fact that the CR lower end will have to be done several times before the CRF lower end will need to be rebuilt. This is not meant to be another two strokes are better and four strokes suck or visa versa thread. Just pointing out some facts and figures.. I still stand by my original statement that 'over time' the costs will even out. In fact the fourstroke may even cost less to maintain. I did not include labor costs since most people do their own labor. The parts prices used are available on Service Honda's website. Have a nice day. :cool: ;) Ol'89r [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Two stroke VS four stroke. Facts & figures.
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