trx400ex
09-03-2001, 06:53 PM
hey guys ....i have a question about the this article. is what hes saying true about needing to run race gas on a any comppression 400ex?thanks here it is, btw i trust this guy and he knows his **** but i just dont know about this one
Jeff, I can do just about anything you want for the 400ex, especially for the mx racing, but the only problem we are going to have is with the choice of fuel. There is no way to build any power without upping the compression, even going big with lower compression still requires race fuel due to the added heat. The 400ex is a lot different than the 300ex, we can take the compression to the moon on them things and make them live, but the 400 is a much different, weaker design and you have to really maintain it, especially if you have it modified and it needs a steady diet of good high octane race gas, 112 octane or higher. You can build a 416cc 11.0:1 compression engine, but you are not racing woods, and then again Jeff, I tell my woods guys with that same engine to run race gas simply for added protection against detonation/preignition. The least slight detonation and this thing will pull head studs like crazy, it will seem like a simple leaking head gasket but what is actually happening is one of the cylinder studs is pulling the threads out of the cylinder-yuck! So now you see what we are up against, if it is a matter of not being able to get it, most places will sell the race gas at the track. We can build you a killer engine for mx, as my rider Aaron Slingluff just took first place at Loretta Lynns in Four Stoke B class, and that was with a 425cc engine, racing against MANY 440's, 426 YZF powered quads and a couple with the Suzuki DRZ engine. I can't take ALL the credit, he is also a very good rider. If you are interested in building a national mx enginje plan on spending no less than 2500 dollars and running race fuel. Thanks, Scott.
Jeff, I can do just about anything you want for the 400ex, especially for the mx racing, but the only problem we are going to have is with the choice of fuel. There is no way to build any power without upping the compression, even going big with lower compression still requires race fuel due to the added heat. The 400ex is a lot different than the 300ex, we can take the compression to the moon on them things and make them live, but the 400 is a much different, weaker design and you have to really maintain it, especially if you have it modified and it needs a steady diet of good high octane race gas, 112 octane or higher. You can build a 416cc 11.0:1 compression engine, but you are not racing woods, and then again Jeff, I tell my woods guys with that same engine to run race gas simply for added protection against detonation/preignition. The least slight detonation and this thing will pull head studs like crazy, it will seem like a simple leaking head gasket but what is actually happening is one of the cylinder studs is pulling the threads out of the cylinder-yuck! So now you see what we are up against, if it is a matter of not being able to get it, most places will sell the race gas at the track. We can build you a killer engine for mx, as my rider Aaron Slingluff just took first place at Loretta Lynns in Four Stoke B class, and that was with a 425cc engine, racing against MANY 440's, 426 YZF powered quads and a couple with the Suzuki DRZ engine. I can't take ALL the credit, he is also a very good rider. If you are interested in building a national mx enginje plan on spending no less than 2500 dollars and running race fuel. Thanks, Scott.