2008年11月12日 · The 490 SHOULD have and could HAVE been a relative to the yz 250, but many things went wrong. Also, showing up on a two stroke motorcycle forum and posting how much you like the yz 490 takes real guts. Its on the level of going to political forum and talking about how cool Communism is.

2013年11月13日 · hi,i'm no yz490 expert but i do remember reading about them being hard to jet and the motor's suffered from pinging/detonation problem's.the good new's is that a simple head mod apparently cured the problem back in the day.heres a couple of LINKS i found with more info on it.apparently eric gore had the fix for this by simply milling the head and squish so you could send it to him for the mod ...

2012年5月3日 · Hello, All, I'm looking for ways to get my 1983 Yz 490 to start easier. My main type of racing is dead-engine-start Hare Scrambles.

2010年7月30日 · ive got my eye on an 82 yz 490, im trying to sell my 79 yz 250 project to fund it. the bike seems in good shape, he says its mint, but i havent seen it yet. ive read some other threads about the 490 and it seems like a good choice. im really excited, have wanted one since i …

2016年8月30日 · Hey everyone have the opportunity to buy a cheap 1984 yamaha YZ 490 and would love to build this in a new style frame for example newer yz450 or 250f or a newer 125 or 250 yz 2 smoker as i love my yamaha's and currently have a yz 125 race build i did this past winter! Now this 1984 engine has the...

2006年12月23日 · Had a 75 MX 400, 76 YZ 400, 82 490, 87 490. I never checked compression once. After blowing the YZ and MX 400 up twice I went to a 32:1 and ran a bit rich. I would run them in Jawbone on the biggest hills in the heat of late spring and had no problems, New piston and ring every year- stock.

2013年11月13日 · 1989 yz 490 --- best mods? By Mountainmanmyke, November 13, 2013 in Yamaha 2 Stroke. Share More sharing ...

2017年2月15日 · Any hints on how to get a 1987 yz 490 to start easier. Any hints or tips appreciated ... The 490 has worn ...

2012年3月10日 · yz 490 questions. By motomonster360, March 10, 2012 in Vintage Dirt Bikes. Share More sharing options...

2013年8月30日 · 004.JPG 008.JPGThe 490 is pretty strong it had its bad spots. But with a few simple mods it works really well. But with a few simple mods it works really well. And most of the vibration is in the pipe and jetting.