Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of engine maker China Yuchai International Limited (NYSE:CYD) jumped as much as 11% today after the company released earnings.

So what: Net revenue jumped 21.6% in the third quarter to $608.7 million and operating profit increased 17.4% to $41.1 million for earnings per share of $0.46. The only analyst covering the company predicted $549.8 million in revenue and earnings of $0.42 per share.  

Now what: Deisel engine sales were up a strong 21.5% in the quarter and truck sales were up as customers stocked inventory. Meanwhile, higher SG&A expenses ate up potentially higher profit in the quarter. China Yuchai's performance has been all over the map in recent quarters and while this quarter might be good the next might now if truck inventory doesn't sell though. Personally, I'll sit out the pop today, because of that inconsistency and my hesitance to buy China-based companies that have a bad history on U.S. markets.

Fool contributor Travis Hoium has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.