84 YZ 250L

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7/28/2017 7:57 AM

Amazingly, I had a really clean low hour '84 YZ 250 follow me home the other day. Just wondered if anybody has the dope on one of these. I know about the goofy Z spokes, but not much else. Was not riding much during the mid '80s. Planned on racing this in the +60 class. Any info would be greatly appreciated. I believe the previous owner said Race Tech had done the forks and shock.
Thanks in advance,
Mike

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7/28/2017 1:07 PM

Put A Jemco pipe and silencer on it. Lean the jetting out 1 size on both. Keep the 48 rear sprocket and by some 450 titanium pegs that mount right up. Great bikes and have a blast on them.

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7/30/2017 12:58 PM

Great bike.

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7/31/2017 5:53 AM

Vaguely remember a Wrench Report on rear wheel alignment, and suggested jetting specs. Several of our guys ran Ohlins on the rear. We all used the little White Bros. do-hickey extender to lighten the clutch pull. Don't recall anyone porting or grinding much on the cylinders, just a quick check and cleanup. Over all that series bike was a pretty tough and reliable steed with minimal issues.

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7/31/2017 7:27 AM

Here's a picture of the bike...... seemed to be in great condition. PO told me it was a garage queen up until a couple of years ago. Looking at several normal wear spots, I am inclined to agree.cool Photo

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8/2/2017 7:12 AM

oldsocalmxr wrote:

Here's a picture of the bike...... seemed to be in great condition. PO told me it was a garage queen up until a couple of years ago. Looking at several normal wear spots, I am inclined to agree.cool Photo

Have an engine builder look up the wrench report from Yamaha for the '84 YZ250. I had one and the thing hauled ass after the motor work. If I remember correctly, there was some porting, head work, and the pipe was cut and re-welded a certain way. Never had problems with the Z spoke, but heard horror stories. Nice bike, I would like to find one like that.

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