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Old 09-28-2013, 09:23 PM   #1
mudmantra OP
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1982 YZ490 trail machine

I've got the YZ490 running pretty good. I really like the bike and the power, but I think I need to smooth it out a little bit. I need a some idea's on how to make it better for riding in the woods. What are the best mods for it? Carburetor, Pipe, Ports, Flywheel weight, Gearing? Any idea's, or experience's of turning up the old YZ490 would help.
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Old 09-28-2013, 09:36 PM   #2
advNZer?
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i would suggest a 490 isnt a woods bike?
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Old 09-29-2013, 01:40 AM   #3
Twin-shocker
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Why not sell it and buy a 200 of some sort? Using large capacity bikes for competitive woods riding is a bit like choosing a chainsaw for delicate work with wood.
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Old 09-29-2013, 03:24 AM   #4
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IT490 fly wheel and cylinder maybe?

Fly wheel weight and a smaller carb.

No experience with them, just wanted to add something more than the "sell it and by something else" that seems to be popular with some members these days.
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Old 09-29-2013, 04:26 AM   #5
Twin-shocker
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Its very easy to spend a lot of money trying to change an open class MX bike into a capable woods bike. Its possible to improve it certainly, but it will never be as good as a smaller machine. When you figure in the cost of the alterations, selling and getting a more suitable bike seems the best way to go for most.
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Old 09-29-2013, 06:03 AM   #6
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Send the cylinder and head to Eric Gorr. viola! Broad smooth reliable powerband with enough power to scare anyone with sense.
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Old 09-29-2013, 10:44 AM   #7
mudmantra OP
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Quote:
Originally Posted by tHEtREV View Post
IT490 fly wheel and cylinder maybe?

Fly wheel weight and a smaller carb.

No experience with them, just wanted to add something more than the "sell it and by something else" that seems to be popular with some members these days.
Thanks. I looked into it. Would be cool, but it's the crankshaft that's heavier on the IT490. It would be a lot of work, but I might try it some day. I just got a stealthy flywheel weight, it should give me a good idea of what to expect.
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Old 09-29-2013, 10:29 AM   #8
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Why not sell it and buy a 200 of some sort? Using large capacity bikes for competitive woods riding is a bit like choosing a chainsaw for delicate work with wood.
I tried some newer machines. They just don't have any charisma. This machine well be set up for having fun, not racing. But I may find a 200 I like someday.
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Old 10-08-2013, 01:51 PM   #9
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Quote:
Originally Posted by mudmantra View Post
I've got the YZ490 running pretty good. I really like the bike and the power, but I think I need to smooth it out a little bit. I need a some idea's on how to make it better for riding in the woods. What are the best mods for it? Carburetor, Pipe, Ports, Flywheel weight, Gearing? Any idea's, or experience's of turning up the old YZ490 would help.
Don't fret mudmantra...all the good mods you'll need to make your 490 a kickass woods bike have been posted.

Twin-Shocker is just tired of getting roosted by big bores. One can only take so much sandblasting!
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Old 10-08-2013, 04:15 PM   #10
The Flyin Hawaiian
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dynodave, I live right by the Rt 72 circle.
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Old 10-11-2013, 04:49 PM   #11
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dynodave, I live right by the Rt 72 circle.
Ohhhh...I get it. Chatsworth (and the like) used to be good places to ride. Recently I have heard not so good things though.
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Old 10-11-2013, 10:15 PM   #12
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Ohhhh...I get it. Chatsworth (and the like) used to be good places to ride. Recently I have heard not so good things though.
There is still good riding in the area, its looking like a tough go for the enduros that are held in the area. All the clubs that use the area for their events are having a tough time with the greenies and such. I can ride from my house and hit quite a bit of good tight stuff still.
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Old 11-19-2013, 07:06 PM   #13
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You aren't going to smooth out a YZ490. I had one when they were new. It'll throw a grapefruit size rock a half a mile...
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Old 11-19-2013, 09:50 PM   #14
mudmantra OP
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You aren't going to smooth out a YZ490. I had one when they were new. It'll throw a grapefruit size rock a half a mile...
Well even just a little smoother on the YZ490 would be OK. It's also supposed to run better and be easier to get the jetting sorted out. But I'll find out when my parts come back. I got the jetting sorted out on my YZ465 and it runs great, throttle response is right there. But in a way, it dose kind of feel like I shortened the fuse to the TNT.
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Old 11-20-2013, 05:27 AM   #15
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You think the 490 has an abrupt delivery you should ride one of these. That is if there are any left in one piece.

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