Sounds like the DR-Z250 is not the bike for carver, but here's some thoughts from an ex-owner.
I had an '01 model. As far as I could find, they are the same bike back to around '94, although I found a review the other day from '97 claiming them to be "completely revised and dramatically better." Photos of '94 models looks the same... Regardless, she's not a modern bike by any stretch of the imagination but has won it's class in the Finke or Aussie safari or similar in nearly stock form, so isn't (or wasn't) a complete dog.
The rear shock in mine was revalved by Craig Brown @ Colemans, man what a difference!! Didn't change the front except raised oil height in a couple of stages, it was enough improvement on a cheap bike (I'm at/under the design weight so springs were acceptable). The Aussies say the forks are crap but respond very well to racetech improvements, and the shock is fine
The carb is a Mikuni TM28SS flat slide. Mine had a horrible bog/lag that was lean stumble, as far as I could find. A couple of different shops tried to fix it, so did I: we never did. Lots of ppl online complain about it. Fiddled with the (sticking) accelerator pump improved it marginally, tried to get it to give more fuel sooner. Then I started reading on thumpertalk about AP timing (for WRs IIRC) and I decided to trade up
In woodhill/riverhead I'd get passed by the bigger bikes on the open stuff, then get held up/repass through the single track...that's riders of somewhat similar ability. On wet days, I'd do better, relative to everyone else. Rider was definitely the limiting factor when I did the GNCC.
I never bothered to even doing basic uncorking to mine, engine was all stock stock stock (but de-restricted of course). Staintune & rejet lift rwhp by 2hp or 10-ish%; too busy riding to muck around with stuff like that.
Main reason to trade up was for less weight (picking it up on steep muddy hills 6 times in a row trying to get going again really knackers you - they have big-arse hills down this way), better power to weight, and better suspension. Definitely a value-for-money bike that performed reasonably well as an all-rounder - it was also a commuter, tourer and sports road thrashmobile with a second set of wheels - but I outgrew it.
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