Its normal for the buggy to seem to go faster in reverse since the gear ratio of the reverse unit holds it in low gear. It was that way before he put the new chain on. You first have to determine where the grinding is comming from. It could be from the reverse box due to the gears not meshing at first then slamming into gear. This can be a simple cable adjustment but you need to determine carefully where the grinding is from before tearing anything up then worry about the dieing engine later. The guy you bought it off probably did not tell you all thats wrong this is generally why people sell them when they are not running . Most common story I hear from 70% of customers who bought non running buggies is : it run great before it sat but now the kids don't drive it and it sat up and now won't start. Since you cannot start it and drive it you have bought a mystery buggy and can count on something else wrong 70% of the time. Good news is nothing costs that much to fix as compared to say a Honda or like unless you have an off the wall brand that parts are no longer available. Lesson to learn here is if it don't run even if there only asking 300.00 offer 100.00 unles they get it running. What brand of buggy is it? If unknown post some pictures for it will deffinately help should you need parts. Also where are you located?
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