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Message: [QUOTE="Canadian Dave, post: 580105, member: 16102"] Before you run out and buy a pipe have a look at the one you have. "Fatty" doesn't denote the profile of the pipe. Have a look at the mounting tab at the top of the pipe near the kick start. That numbers are stamped into it K_-30 is a rev pipe and K_-35 is a torque pipe. Torque is tuned for more bottom end. Look for mechanical problems that may be causing you to loose bottom end. How the silencer's packing? Has it been replaced recently? What’s the compression like. Many factory shop manuals wrongly identify the left and right power valves. Pull the pipe and look up into the exhaust port. Both sub port valves (the side valves) should be closed when the bikes not running. Pull the plug off the clutch side of the kips system and insert an appropriate sized t-handle on the nut. Rev the engine and insure the kips system is working. You'll know it is if the t-handle rotates. Check you jetting and let us know what's in there. Could be the pilot circuit is a little lean or the transition between the pilot circuit and needle is a little lean. There's lots of things to check before you go out and spend your hard earned money. It would be nice to have someone like Eric look at your cylinder and determine what kind of power it was ported for. Could be all you need is some head work to bump the compression and you’ll be back in business. Do you have the tools to measure the port heights etc? If so that info should go a long way to helping determine what kind of porting you’re dealing with. Ever had the top end off? David [/QUOTE]

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