Without a moment's delay both boys shut off power and applied brakes, bringing their machines to a standstill beside their comrade. Dismounting hurriedly the riders approached their friend. "What's the trouble, Jack?" inquired the red-headed lad. Then without waiting for an answer he wrinkled his freckled nose in disgust and stepped back with loud sniffs of displeasure. "You needn't tell me; I know," he cried.[Pg 9] "Somebody tried to take lessons in cooking and burned the water before it could boil!" [Pg 9] Both his comrades laughed at Jimmie's remark. Jack, however, turned again to an examination of his machine with a worried look on his face. Touching the parts gingerly he went carefully over the engine. "Whew, Jack," spoke up the third boy, "you're surely some loud smeller! What did you run over and why did you do it?" "I know!" cried Jimmie excitedly. "He's got a hot box!" "Sure?" inquired Jack teasingly. "Hope I never see the back of my neck!" declared Jimmie. "Guess I know now what that freight train conductor out in Montana meant when he spoke of a 'stinker,'" Harry mused. "But how did you get it?" persisted Jimmie. "Boys, if you want to know the truth, I think some one was unkind enough to wish this onto me!" soberly declared Jack. "You don't mean it!" gasped Harry with a startled look. "I do! When did we overhaul these motorcycles?" "Yesterday. Each boy worked on his own[Pg 10] machine, and I know I did a good job on mine. It runs like a scared rabbit!" [Pg 10] "All did good jobs! Mine, too, was in perfect shape. But look at that main crank bearing now! It's positively frozen!" "Ho! Ho!" jeered Jimmie. "Frozen! Why, it's so hot you daren't even touch it! Just see it frying grease this minute!"