I wouldn't say that it is "okay" to do. We don't know what jets he's running, what ratio of premix, does he have a fresh top end and clutch, what type of rider he is (aggressive/passive), etc.
I ALWAYS run a paddle (I have on 250's, 500's, 4-strokes). Any bike you take will run at a much higher temperature than normal. Only you know how you maintain your toy. What is good for one person might not be for another. You take that chance of grenading your engine when you run w/o a paddle. I know there are always exceptions but I would suggest you spend the $ to save the $ in the long run.
The top end is good. It's a 94 250. I run the recommended 32:1 and switched back to an 8 plug. It's got an FMF fatty pipe and should be jetted accordingly but I personally didn't re-jet it. The bike is well maintained. Maybe I'll just ride at Ocotillo until I get a paddle. I've only been riding the bike for a short while. It's a good learning bike.
You will be fine but a paddle is nice. I rocked a 125 out there for a week without a paddle (new meat though) and geared for the dez and it took me everywhere back when I was in highschool. Just stay on the pipe.
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i rode mine about 5 trips without a paddle , climbed olds without it , so its not that bad but it took its toll on my top end on the 6th trip. let me tell you , its a long PUSH from osborne to the ranger station on gecko !!
its 10 times easier to ride with a paddle . save your bike and stay on hardpack .