The trailmaster uses the internal reverse engine which is more money. You can make repairs yourself if you have any mechanical ability and a good manual and some patients. You would pull seats, valve cover, tentioner, than 4 nuts which secure the head and cylinder. Easy job really. If you go to americanlandmaster.com, click on owners than manuals a list will pop up, just scroll to 7150 or 7151, click and choose engine service manual and download, there is also a transmission manual I would recommend. The manual has excellent illustrations and easy to understand instructions to totally rebuild the engine. Download and read through to see if it is something you could handle. If you then have any questions you could give me a call @ 662-301-1563, if no answer make sure to leave a message and I'll get right back to you. While tearing down if you check engine timing first with valve cover off. If chain is tight on sprocket and engine is in time the bottom end will be good so you'll just be pulling apart the top end of engine in frame. As I said earlier if you have any mechanical ability and patients and can follow instructions it's an easy job. You would need basically 8mm,10,mm and 12mm sockets, pliers, small screwdriver, some other basic tools and a torque wrench in foot pounds you could pick up for 30.00 at harbor freight or even rent one from auto zone however you need one that will read 25 ft/lbs. With you doing work you would need maybe $50-$100 in parts but you will want a quality part and not the cheap crap on Ebay and Amazon. You could even go with larger bore and head for increased performance much cheaper than a new engine.
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