Comments on: Shocking Four Stroke Costs

By: elementx665

elementx665 — Sat, 27 Mar 2010 05:05:20 +0000

my 02 kx250 has never had a topend or anything. just new spark plugs thats it and still runs like a beast.

By: jrhockey03

jrhockey03 — Mon, 15 Feb 2010 14:20:49 +0000

So I just rebuilt my ‘02 KX250, guess how much it cost just for the top end with gaskets…. $230 (Canadian $$$) I could have gotten a full rebuild with the crank and gaskets for $480. The old girl was still running strong and I used to race it when it was brand new. When I took the piston out there where no marks on the cylinder or the piston. I could have just threw a new set of rings in and it would have been good, but I figured I’m already in there I may as well do the whole top end. I was really close to buying a KLX450 cause I could have gotten it for $5600 but I’m glad I didn’t. Plus 4 jokes sound like crap when you pipe them up.

By: sooo sooo true!! - E2S

sooo sooo true!! - E2S — Sun, 14 Feb 2010 03:23:49 +0000

[...] sooo true!! Shocking Four Stroke Costs :: Two Stroke Motocross read this arcticle. its is absolutely true! __________________ 1986 lt250r Currently Stripping [...]

By: Paul

Paul — Sat, 13 Feb 2010 20:05:19 +0000

About 10 years ago I heard from a very reliable source of a test conducted with the ‘big 4′ 250 MX engines. The engines were set to run on a dyno at redline, at Max HP, approx. 7500RPM, and left in the room until the motor failed. The Honda CR 250 held up the longest at over 80 hours! That is 80 hours of top revs without a break. How long would you bet on a 250/450F to last in that same test?
So far, I am on my 10th season of play riding, racing on my 81 490 Maico since rebuilding it 1999. I took it apart last season to paint it and the motor did not need any new parts. Nothing! I ride vet expert classes and do not baby the bike like some of my 450F riding buddies. I’ve seen 4-strokers blow apart where peices scatter all around the bike.
Paul

By: 2STROKEREVOLUTION

2STROKEREVOLUTION — Tue, 09 Feb 2010 06:42:03 +0000

So if you race a 250 2-stroke, a 450F, and a 250F in motocross at the same pace what would be the expected life of each engine?

Just piston and rings? Valves? Full rebuild? Clutch?

By: JohnNicholas

JohnNicholas — Sat, 06 Feb 2010 04:14:29 +0000

2STROKERREVOLUTION – remember that the 15-20 hours is the recommended service interval on the four-stroke. For the YZ250 two stroke, Yamaha recommends replacing the rings after every third race and the piston every fifth race.

In actual practice the difference will be in how you use your machine. If you are a hard core racer competing in the Nationals you service schedule would be much more often than a trail rider on the same bike. I know guys with YZ250’s that race motocross and only change the piston and rings once a year!

In Pro Racing the factories change the motor after every event and sometimes after practice! Costs for four-stroke motors runs between $12,000. and $25,000 depending on who you are talking to.

If you were to race a two-stroke at the Pro level you could easily rebuild a complete motor for less than $2,000.00 per event.

That is a huge difference in a racing investment, no wonder the factories are having so much trouble getting sponsors to support this kind of costly racing!

The sad part is that many people base their buying decisions on a bike based on what wins in Pro Motocross. Even if they don’t race motocross…

Unfortunately the guys that actually buy the bikes are beginning to catch on. At first I’m sure some of them just thought they were having bad luck, but after blowing up multiple motors, they got the picture…

Hopefully they decided to buy two-strokes instead of taking up another sport!!

By: 2STROKEREVOLUTION

2STROKEREVOLUTION — Sat, 06 Feb 2010 02:40:58 +0000

So a 450F lasts 15-20 hours. How long does a 250 2-stroke last?

By: irace2tmotos

irace2tmotos — Fri, 05 Feb 2010 16:23:33 +0000

I know it has been done before, but the prices of rebuilding a two stroke should be shown to all.

There still is and will never be one of these overpriced, over weight, ill handling, run for 1 week 4 junks in my toy box. I have had motorcycles since 1970. Lot’s of them! My 1994 Suzuki DR 350 had 8900 miles on it and never had the top end off yet, still runs strong.

That’s funny the one dealer says “hey it’s a race bike”. I see the same dusty 4 junks sitting in the same place on my local dealers showroom every time I visit. I laugh really hard as I walk by on my way to the parts counter to buy parts for the older 2 strokes I’m totally rebuilding for less than 3 grand… LOL. I can totally rebuild older 2 strokes all day that will out last, thrill me when I hit the gas, and out run the new 4 brokes.

A 500 AF will roost all over a new 4 joke. Every time I visit my dealer for parts for my 2 strokes, I tell him I will never buy the products he is selling now, and other dealers who sell Service Honda, KTM, Gas Gas, TM, Ossa, Maico and Yamaha, will get my dollars.

DO NOT BUY THESE FAULTY PRODUCTS, IF THEY WERE AUTOS THEY WOULD BE RECALLED BY THE CONSUMER PRODUCT SAFETY COMM,among other groups, in fact I’m sending info to them for exactly this concern. These products are a safety hazard, and a rip off.

Let’s get thew REAL word out! Either build good products the consumer will buy, bring back the 2 strokes, or go out of business!

Check out the new Gas Gas line!

By: msambuco

msambuco — Thu, 04 Feb 2010 02:21:56 +0000

I hava an 08 YZ250. I am very guilty of lack of maintainance since I have not raced in years. I spend my time on the kids bikes and ignore my own. My bike has many hours on it and by compression check there is still no reason to rebuild yet. Used to be 4t was indestructable and 2t was high maintainance. Tables have turned and the 2 stroke is the longest lasting cheapest most high powered racing engine you can possibley run. I own 08 yz250, 03 kx65, 08 kx85, 87 cr500, and an 05 230 honda 4t 4 wheeler. Yes the 4 wheeler is most reliable but crank the HP up and then it is junk. Any 4 strokes going to Croom this weekend that want to look at my rear fender???

By: 357 Racing

357 Racing — Wed, 03 Feb 2010 23:11:48 +0000

Just blew my 88cc crf50 motor up. Dropped a valve, valves, head, piston, cylinder are paper weights now. My other pit bike motor is now buring oil, needs new valve seals.

My 10 year old 2-stroke weed whacker still running strong = priceless