4-Stroke Motocross Bikes Are Ticking Time Bombs Because....
704-stroke mx dirt bikes are ticking time bombs because....
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First of all I just wanted to say that these four strokes are not bad or defect bikes(most of them anyway), or that I'm partial to two strokes. This is just my honest opinion about the modern four stroke motocross bikes; 250f and 450f. They are very fast bikes and I will admit that they are easier to win a race with than a two stroke because of all the torque they have and the somewhat-smooth and endless power. But with that much advantage they must have a downfall, right? Well my answer would be yes, and the reason saying that is because these extremely high-revving, performance engines can grenade very quickly without much notice. Not to say that this will always happen, because a lot of riders can put one hundred hours or more on their four stroke motocross bike without having any problems. It's the owners that don't maintain the bikes or repair them properly that this usually happens to. A two stroke top end is fairly easy enough for most riders to rebuild if they have a manual and the tools, but a 4 stroke engine is more complex with many more parts involved. If one slight mistake is made, such as over-torquing a bolt in the engine, the engine can and most likely will break down, and if one part in the motor breaks then it usually breaks other parts. The cost to repair a four stroke engine is enormously high, especially if you take it to a mechanic. Take this for example: You have a 250cc two stroke and 250cc four stroke that both have blown top ends and you will be having a professional mechanic do the work for you. The 250cc two stroke will cost anwhere from $200-500 for brand new parts and another couple hundred for labor. Then you take the four stroke, and the parts will cost around $1000 if not more, plus you have to pay for labor. Also, if you do the two stroke yourself, which most riders do, you won't have to pay labor fees. Now I'm not trying to start an argument about two strokes vs. four strokes, or even try to convince you to buy a two stroke. I'm just expressing what actually can happen to these bikes. Although four strokes are easier to ride, the repair bill can add up to the cost of buying another used bike. I have both types of motocross bikes and they are both great to ride, but I normally go with the two smoker because it is much cheaper to maintain. If you want to ride four stroke, by all means go ahead, have fun, and make sure you maintain it. But get ready for a big bill if something happens...... Thanks for viewing.
250F Cylinder Head
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Yeah ok, I see what you're saying. It also depends on what parts you have to replace and what all the mechanic does. When I say $1000, it's because the cylinder, piston, head, valves, cams, etc. do actually cost around $1000 for new oem parts. Now you may not need all of those parts, but that's usually the case. Thanks for the comment.
Yep just blew my 06 KX250f up and it sucks.
Love the bike but it is $1500 to fix now. And thats doing it myself.......
so I bought a 94 KX500 which I'll ride while the 4stroke is down. 500's are a nice reliable bike.
Thanks for the comment. Yeah, that's why I race with 2 strokes. Check out my website at http://motocrosshideout.com/
i agree completly i think its good to have both race with 2stroke and just ride with 4. (keeps you from maxing out the 4 stroke all the time) i own both types and if one breaks down i always hope its the 2 its so cheap due to no moving parts. and you need a good sponcer or alot of money to put into motocross to keep a 4 stroke competitive. as 2 stroke are cheap and if you tune them for the track and add some aftermarket parts with the money you save since u dont have a 4 stroke and you can own 4 stroke bikes every time. ps always remember ride hard ride fast but most importantly dont get scared. i live i ride i am honda cr 125r
TO MX4GOD, i read your blog, i already know all about the problems with 4 strokes through word of mouth an research. I am writing to you because i am buying a 250SXF, but before i actually get it i wanted advice on how to maintain it, as this will be my first MX bike.I will be riding it almost every weekend. ANY ADVICE WILL BE APPRECIATED!! Berron
I'm an ex-mx racer from Sweden in the 70's, the hotbed of mx in that day. 2-strokes are ruling mx because of politics, marketing, and profits, not because they are superior to 2-strokes. Any race-bike must be serviced correctly and often, totally stripping a bike or engine every 2-4 races was not uncommon in my day, if the bike/engine deemed it so. Both my 4-speed and 6-speed 250 HVA's ran for 25,000kms each, rarely failing (coil fell off, sort of idiot problems). Both were still running the same bore after this time, sealing perfectly. The 4-speed was stripped and checked often, gears needed changing twice a year for example, I realised I was changing parts more often than needed so the 6-speed ran for 3 years without ever splitting the engine, just pistons and rings needed (but I was always checking, just in case). 2-strokes should be geared to pull hard, not rev like buggery, and jetted to run rich, only chiming-in properly after 20 percent of the race, more on hot days on tough sand tracks, for example. A rich-running engine grunts better than a tuned-to-a-tee one will. Only rev out when called for. And don't run a 2-stroke on synthetic, let alone at 100:1; use only common mineral-oil at 25:1, the thick oil-film helps lead heat away from the piston and out via the fins. The Hon/HVA 4-stroke special I last rode was a waste of space - and money. The only 4-strokes worth looking at were the old ones from the 60's, but these were too heavy to be competitive and none raced them now. But those old 4-stroke engines were FAR superior to todays offerings. Not cheap, either, the really good ones, Lito, Hedlund, the HVA/Monark series, raced by the old greats, Bill Nilsson, Lundin, Tibblin etc., would probably cost about 100,000 dollars in todays money. Yup, you read right. But they were of the highest quality. And they were serviced properly, cost no object. I would refuse to buy a modern 4-stroke, as there would be no way for me personally to service it the way it should be, nor would I have the money to do it, nor do I know a mechanic/machinist with the skill to do it. Nils Hedlund is too old now, retired, the others dead. But a 2-stroke I can manage myself. Having said that I'd love an X-Cam Lito 4-stroke in an alloy monocoque chassis with twin Ohlins - and even better, I'd love to be 40 years younger in order to really ride it as it should be!!!
iv been riding dirtbikes since i was 4 years old iv had my fun on both bike 2 stokes and 4 strokes i loved rideing period but my opinion on the matter is 2 strokes are funny bikes and easy to fix but are all was seem to be fixing them but it true when something on a four stroke bike gose it there as kicks you in the ass with the pirce to fix it but dosent matter what you ride as long as its got two wheels and rips like hell and if you have fun on it thats what matters thanks for reading
Awww nah
So what you are saying is = if you have the money and/or time go with a 4 stroke ;)
LOL... I thought this was written in the early 90's at first!Have a nice life in the dark, chump.
Mike # 370 2 years ago
Hello Kelley, I have a few things that i noticed in your blog that aren't completely true. Umm first of all the four strokes when you get the top end rebuilt with a mechanic doing it, its not $1000 plus. Its around $600 too $700 dollars. And another thing is you said that 4 strokes when you do something wrong in the engine its going to break down. Now that is with any bike. The same thing happens with the 4 stroke. But like you said if you take care of the bike it is good. Ive rebuilt my engince once in the 2 years of having mine, racing every weekend. So yeah just a few things i though i should comment on. See ya at the track.