Motor question, going south, or bad tune?
Ok, let me start off by saying I'm way over geared. Some of ya'll know what I did, but for those who don't, I'll explain. I took the suspension off my Volcano EPX and transferred it to my Tornado XL chassis, cuz I wanted a nitro truck. I still have the orig tooth count clutchbell on it, 16 or 17, what ever it is. I know I'm geared high. With that being said, here's my problem. I start up the engine, and it idles great, pulls great, but after about 5 or 6 min, it won't rev out. It revs some, then sounds like it's bogging and won't rev hard. It still pulls good, but won't climb into the higher rpms. But it will for the first several minutes. Now, if I drive it around easy after that 5 or 6 min, after a few min it'll start to rev good again, but never as good as when it's cooled off and then run again. When I say cooled off, I mean still warm to the touch, usually long enough for me to get it into the shop for fuel. So, does this sound like an engine on it's last legs, or maybe I'm too rich/lean? I've got a pretty good trail of smoke, even when it's having this problem. Also, I'm pretty sure it's not overheating because I can wet my finger and run it over the head after a good run, and it doesn't sizzle and pop, it just evaporates off. Any suggestions guys? I don't really want to buy a new motor, and I don't want to ruin this one if it's not already. Thanks