Author Topic: new yz490j project  (Read 706 times)

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Offline buzzard

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new yz490j project
« on: April 19, 2017, 12:25:04 AM »
hi guys been gone a while, sold my it250j and picked up a yz490j in need of lots of love. parts like the tank were spray painted several colors without taking anything apart, the frame was a mixture of yellow and white. just a mess. fork seals were totally gone, brown murky water came out of the forks. with a lot of elbow grease and a rattle can I cleaned the frame.


the kick start shaft is broken and worn, as is the clutch cover, but the right side engine case also has a hole in it, I assume from when the kick start crapped out. (what looks like a crack in the middle is just a piece of wire)


this seems to be a common problem? I'm wondering if I can take the cases apart an jbweld the hole from the inside and out? any insight appreciated
 
82 IT250
96 polaris scrambler 400 4x4

Offline Jock

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Re: new yz490j project
« Reply #1 on: April 20, 2017, 07:04:51 AM »
I'm not one for jb weld, I'd be looking for a set of cases or replacement bottom end.


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Offline buzzard

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Re: new yz490j project
« Reply #2 on: April 19, 2018, 08:44:38 AM »
hi guys. I got the case welded, good as new; bottom end is buttoned up with new bearings and seals. have the bike almost complete, but I can't find a cylinder. to help my search I was wondering, will a yz465 cylinder work?  how about an it490/465? I got a "maybe" on thumpertalk, but I figured this would be the place to ask for certain. any help appreciated. cheers
82 IT250
96 polaris scrambler 400 4x4

Offline mudmantra

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Re: new yz490j project
« Reply #3 on: April 21, 2018, 02:50:36 PM »
Yes it would work. YZ465, IT465 or IT490. I have a 81YZ465 cylinder on a YZ490j motor. You just need to tune it for the top end you have. YZ490J cylinders used to be easy to find on ebay, normally on the last overbore.

Offline buzzard

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Re: new yz490j project
« Reply #4 on: April 25, 2018, 01:20:14 AM »
thanks a lot. lots of good info here, as usual.  cheers
82 IT250
96 polaris scrambler 400 4x4