![]() when yet its the resistance that the bearing is putting on the crankshaft and ultimately the idle itself. With the bearing compromised and a low idle starting to occur, guys will start to re-tune the engine thinking its the tune that is causing the poor idle. I believe many people, including guys that do have experience with tuning and are very good at tuning make this mistake, ive done it myself. There is also possibility of tiny pieces of the bearing to break up and get chewed up by the piston and sleeve. sometimes the noise isnt so noticeable, the engine will stall out. The symptoms of a bad bearing is a bad idle, horrible rough sound and you will find yourself chasing the tune. Just under a gallon the bearings go bad.Sure i have had a 3.3 in which the bearing somehow lasted 3 gallons and its amazing. Its absolutely unacceptable that an engine from a reputable company like traxxas have bad bearings right from the start. 2 of the many 3.3s ive bought had the rear bearing go bad literally right after break in. Unfortunately somebody without a trained ear wont even hear the rough bearing sound within the engine while its running. The 3.3's rear bearing is absolutely garbage.they go bad. 3 of them were toasted and now my other 5 are running amazing all the time. I have alot of experience with the Trx 2.5 and 3.3 engines, ive had about 8 of them in total. However i notice alot of people complain about the engine not idling correctly and it stalls out and or runs hot. It does a great job putting the power down in these RTR Revo's and T-maxx's, rustlers and jatos. Racing engine? Anyway, it is a lovely engine as far as rtr's are concerned. Hey everybody, i wanted to post a thread regarding an issue with the Trx 3.3 racing engine.
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