Posts
240
Joined
1/31/2011
Location
Walnut Creek, CA
US
Edited Date/Time
1/27/2012 11:57am
I'm not trying to start an arguement... Its kinda beat to see all jap dirtscooters going 4stroke except yamaha.... Vulliman is having the french kid cedric racing a YZ250 against the 450's this weekend.......... I like both bikes to be honest but prefer a two stroke.. Tje no engine braking is a plus! Always starting a plus! Lighter a plus! 180$ topend rebuilds instead of thousands! 53 horsepower out of a 250 stock 2 stroke...... And that upper rpm pull...... Last brrraaaap! 4 strokes are sick but i cant see how parents and privateers can afford to fix them
If your a racing a series.... Its gotta be brutal on the pocket... They seem to be a tickin time
Bombs and valve eaters!!! Companys are making way more on fix it parts than the bikes.. And i feel they should always have a 125 school boy class! Everyone needs the joy of a 125!
If your a racing a series.... Its gotta be brutal on the pocket... They seem to be a tickin time
Bombs and valve eaters!!! Companys are making way more on fix it parts than the bikes.. And i feel they should always have a 125 school boy class! Everyone needs the joy of a 125!
The Shop
Free shipping: VITALMX
DeCal Works Huge Plastic Inventory of UFO and Polisport kits.
Luxon 4-Post Bar Mounts
$189.95 - $239.95
Welcome
There are two realities for two-stroke and four-stroke racing in the U.S...pro and amateur.
For many amateurs they're a good choice for all the reasons you mentioned.
In the pro class, under the current rules, they're a novelty that makes old-schoolers giddy, but they have zero chance of anything approaching a top ten.
Here's some reality for you...none of the manufacturers submitted 2011 two-strokes
models for homologation for motocross/supercross. As I understand it, the most recent model that can hit the track is a 2010...and that's good for five years.
I'm not sure how that affects amateur racing.
I think not ( was already pissed of with the weight,handling,engine braking,hard starting the list gose on)
I will never have anything to do with 4 strokes again
sold my cr250 a few months ago, to a guy that rides trails and fields.
Tell us a story: Tell us how much better your 250F is than a 250 2 stroke...
Pit Row
Yes, I don't like a 250, period. I am 6'2" and 225 lbs. Back in "the day" when i rode 250's, I was always finding every mod I could to get more power out of it (Porting, head work, pipes, reeds, etc ). That is big money when you are buying new cylinders and getting 300 bucks worth of porting done every season. I don't need to mess with my 450 motor, they come stock with enough power in all the places I need it. I'd still be running the factory pipe and silencer if they didn't get smashed and worn out. I am rebuilding my head for the first time in 3 seasons, right now. I'm still on the second piston. So far, I have spent $160 on my 450 motor for 60+ hours of motor time. I would be WAY over 1K in top end kits and cylinders on a 2fiddy by now (even more if it was an F). If they start making a DI 350 2 stroke, maybe i'll give 2 cycle internal combustion motors a try again. I've had a kx500 before, and though a 500 has that low end torque and full powerband, they are just a little bit of a handful for me. I'd give a 500AF a chance if I could find someone around here, that would let me try theirs for a few laps.
One point I wanna say though. Saying you'd be over $1,000 in top end kits on a 250 2 stroke at 60 hours is crazy. You do realize that a 250 2 stroke and a 450F have exactly the same routine maint schedule, right? Doubt it, go look at the Honda manuals. At 60 hours, you are also due for a crank now, and let us know how much the head work ends up being. Remember, a CR500AF, can be detuned. Anything can be detuned, to run as slow as another bike. Owners just tend not to do so. Just sayin
here is a copy of the wiseco kit (and gaskets) I bought back in april (at 47 hours)
Order date: Apr 19, 2010 9:28 AM EDT
Google order number: 376332447406270
Shipping Status Qty Item Price
Not yet shipped 1 Honda CRF450R Wiseco Piston Top Kit 02- 8 13: 1 Comp - Honda CRF450R 2002 2008 Wiseco piston Wiseco piston part 4822M09600 Std bore 96 mm 13 : 1 compression ratio Pistom comes w... $178.00
of course I have spent more on MAINTENANCE, I change my AF every ride, and buy new ones just about every 2 months. However, that is the only motor related repair I have made to my 07 crf450 in 3 seasons of pretty hard riding, and 7 races of 30+B, and 25+B. I'm no pro, but i'm not slow. I ride BDMX just about every other friday during the summer. They key to making a 450 last is maintenance, and not riding the rev limiter.
i agree with you Meidos on almost all your points. You have to admit though, that blowby and loss of compression starts in a 2 stroke WAY before a comparable 4 cycle. Its the nature of the lubrication system and the ports in the 2 cycle cylinder. I grenaded my '00 250 back in 07 due to pushing the maintenance interval out to the end of the season. The old "just one more ride". The air was cold, my mixture richened up, and BOOM. New honda cylinder 342 bucks (not ported. add another 300 for that), new piston, rings, and gaskets $180. New crf450 head with stainless valves and gasket kit $600 bucks. I won't be replacing my crank yet. Guys routinely get 100+ hours out of a stock cr450 crank.
If I can get a chance to ride one, I HAVE thought about getting a cr500AF. Its just WAY more cash to layout than i want to.
Oh yeah, and BTW, I just got back into racing after about a 5 or 6 year break and I did it on a mint 06 RM250 that I picked up for $2500. It had about 10 hours on it. I couldn't touch a 4 stroke worth my time for any where near that so I figured, how bad could it be? Truth be told, it wasn't bad at all. I had a blast riding it and I was competitive on it. Albeit I am just racing a local vet class but it was still enough machine to keep me battleing with the top 3 all season and keep me smiling. This off season I made the investment in a new 2011 RMZ450 but I decided to keep my good ole smoker just for the fun of it
Post a reply to: 2stroke vs 4stroke in reality