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About VintageYamaha

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  1. And you're right. Innovation doesn't always award a better bike. The backwards cylinder head idea was clever, but a lot of riders complained about it's shakyness upon entering corners and under braking. Remember the '97 CR250? It had the first generation DeltaBox aluminum frame, which was very innovational, but it was too stiff and very unforgiving in the rough stuff. I rode one, and I certainly didn't like the stiffness out on a motocross track. Maybe on a smooth, prepped motocross track, where it designed around McGrath's riding it would have been beneficial, but on a typical motocross track, you don't want to feel every bump on the track. And let's not get started on the old Cannondale MX400.
  2. In truth, Suzuki hasn't been selling many bikes over here in the last 5 years, due to the current economy. When the stock market was about to plummet, and people didn't have the money to buy a new bike, Suzuki was sort of refusing to import bikes over here in fear that they would sit in the showroom for years. That also killed them, because motorcycles is mostly what they sell. Their cars were getting popular over here, but that wasn't enough to help them get back on track after losing so much money on the sales (or rather, the lack of sales) on motorcycles. For a while, the only bikes imported over here was the RM85, RM-Z250 and RM-Z450 and the GSXR-600/1000. Suzuki just pulled out of car production recently so they can work on producing and selling more motorcycles over here. If you don't think Suzukis are popular, go to a vintage motocross race. You'll see a plethora of evolution class and post vintage RM's on the track. I still run into a lot of Suzuki RM125's on Craigslist in my area. They were just as popular as the other "Big" three, but the last few years weren't so kind to them. Also, not to mention, they no longer have a factory team effort. Yoshimura and Rockstar are both privateer teams.
  3. VintageYamaha

    What should i buy for a 2012 250?

    This all comes down to one thing. Your riding style. If you've been riding four strokes for a majority of your life, than you're probably going to prefer a 250F over a 125/250 two stroke. I grew up on two strokes, starting on a PW50, on to a RM80, and eventually to "big bikes" on a 125, when four strokes were coming on to the scene. Four stroke riders ride with a much different style and use the power much differently than a two stroke rider. If you were to jump on a 250 two stroke, it would make you have to ride with a totally different kind of style, having to get use to the light, flickable feel, and the having to steer the bike with the rear wheel. You'd also have to adjust to the abrupt power and learn to use that clutch to get the RPMs up and keep it up on the pipe. 250 two strokes require more throttle control. If you've been riding a CRF150R, you'd be happier to jump up to a 250F instead. Riding two strokes is a totally different game and I'm sure you wouldn't want to learn to how adjust to the bike all over again. This all comes down to racing, of course.
  4. VintageYamaha

    Love for the 125

    Well, it may not be a motocrosser anymore, but it's a 125! A 1976 Yamaha YZ125X. DG "Sunburst" head, Mikuni VMC38mm carburetor, MotoTec ignition, Bill's Pipe expansion chamber, Wiseco (0.30" over) piston.. All of it, sitting in a Staracer short track frame, with old Ceriani forks, Boge shocks, a Harley-Davidson Sprint front wheel, an unknown brand of spool rear hub, Pirelli front tire, Carlisle Arrow II rear tire, my grandfather's CNC'd adjustable triple clamps, and some unknown brand of flat track bars. Soon to come, compression release, new grips, paint the fiberglass, and find another spool hub to use for the front to lace up to an Akront rim.
  5. VintageYamaha

    Mark my words...Stewart will be 2012 Supercross Champion.

    I'm not putting my money on Stewart.. Although, I like the guy before he got caught up in his television show madness, I just don't see it happening. Yeah, he can be smooth, and ride like it's effortless at times, but he tends to burn out towards the end of the race, much like how Alessi does. And at worst... It seemed like to me, every time he would get caught up with Reed or anyone just as fast as him, it's like he doesn't realize they're on the track and he takes himself out, along with the other guy. Anyone remember the first part of the '09 season, I believe Aniheim I...? Where he took out himself and Reed in the whoop section? To me, whenever the racing gets closer, he gets wreckless and rides over his head. I'm going to be cheering for Reed. He's nearing 30 years old now, he's got his own team together, and he's got tremendous speed. Trust me... He can beat Stewart. Honestly, I can see him beating Villopoto and Dungey. Though, I honestly think Dungey's going to take it this year. I'm praying for KTM... They really need a championship and with DeCoster at the helm, I think it's going to be a good year for them.
  6. VintageYamaha

    1973 sc500

    Because I own a '73 SC500, I can tell you several key points of the SC500 you need to know. The '73 model had a points ignition. The '74 had the electronic ignition. Any YZ ignition will work wonders, even a EMGO ignition from Dennis Kirk. The points ignition was the reason these old two strokes liked to kick back. I kick start my SC all the time, and it's never once kicked back. You'll definitely appreciate a compression release... The stock pipe is.. Ehhh, decent. But it's part of the reason for it's erratic powerband. Most aftermarket pipes will smooth out it's hard hitting transfer into the mid range, all the way up to top end. The pipe on mine, allows for a smooth, yet strong pulling powerband and it has plenty of over rev, without the power dying off in the top end. These are no long stroke 500's... They're oversquared 500's, so you're going to have to deal with the lack of bottom end power. Also a major help would be to go down a few teeth on the rear sprocket. The SC500's "seizing" problem, was due to.. Well, Yamaha's poor boring techniques back in the day. With the cylinder properly bored to size, and a good set of rings, it'll never seize up on you. And I know, in the book it says to run 15:1 premix... Don't. Get rid of the auto-lube, and run 32:1 to 40:1. Part of the detonation problem was the super rich oil to gas ratio. I guess it was to make up for the poor cylinder bore...? The SC500's 4 speed transmission is actually sufficient enough for moto and hare scrambles. There's a plenty of power from mid range to top end, so you pretty much have to ride it like a 250... A 250 that rip your arms out of socket. So prepare to use the clutch on these and be very smooth with the clutch and throttle... They can get out of hand quick. Now, if you're planning on doing some more wide open racing, (my SC500 engine is in a Champion flat track frame.), the MX/DT360's 5 speed transmission would be great. But unless you know how to handle these bikes at full throttle and have tried every gear ratio, the 5 speed won't be so necessary.
  7. VintageYamaha

    Because I'm new here...

    Thanks guys! The KX500 does look fine.. But only from a distance. It's been through hell. Thankfully, I live in the same hometown as the man who tinkers with these bikes, named Stewart Rouse, so I got some help with it on parts and tuning. It's a forgiving bike with a smoother powerband, compared to my old '87 Yamaha YZ490J (which I still have and is in the middle of a rebuild). And I have raced in the MHSR races, and done one of the Hillbilly GP races. I'm hoping to get more involved in them. And by the way, I'm from Joplin, Missouri.
  8. VintageYamaha

    Because I'm new here...

    Thanks! And actually, I do race the Open Class at my local motocross track on the KX500, but it does become a handful at times. Though I race it in hare scrambles mostly, the suspension does pretty well for motocross. And the 51T sprocket keeps me away from 1st gear all together. Besides, who needs 1st gear on a 500cc two stroke?
  9. I'm used to forums where there is a "welcome to" thread section. I guess there isn't one on this site, so I might as well introduce myself here and not seem like a total jerk. My name is Spencer, I'm 23 years old, avid vintage motorcyclist, and yes... God forbid, but I'm a two stroke enthusiast. Does this mean I don't ride or work on four strokes and enjoy them? Absolutely not, as I do own a few. However, most of the bikes I race are two strokes. And I am an avid flat track racer and hare scrambles. Here's "the list". 1985 Yamaha YZ250 1991 Kawasaki KX500 1997 Kawasaki KX250 Champion framed '73 Yamaha YZ250 Champion framed '74 Yamaha SC500 Staracer framed '76 Yamaha YZ125 1985 Yamaha RZ500 V4 - project 1975 Yamaha RD350 1965 BSA 441 Victor 2005 Honda CRF450R 1974 Honda XL350 There's some other bikes as well, but these are the ones I focus on the most. I pretty much have a salvage yard full of bikes in a storage shed... We just accumulate a bunch of bikes from picking them up for cheap or people trading stuff for them. Anyways, I hope to enjoy the site as much you guys do.