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Fellow big bore brothers, I have uncorked my XR650L with Dave's Carb Mod, popped the top snorkel on my air box, Free Flow filter, and finally wore out my stock Bridgestone TW knobby trash tires and put on Mitas E07 front and rears. I am now searching for an exhaust kit that compliments the bike aesthetically, gives it a good bark at idle and highway speeds, and still delivers good power. I have been considering XR's Only header and slip-on but haven't heard to seen too many reviews for it... but like the price I have also considered FMF since I was never disappointed on my 2 strokes or my previous CRF450X... My ears and mind are open to suggestions... what is everyone using? I am budget conscience but more so concerned of getting a kit that may need re-jetting due to the existing Dave's Mod. Thanks -Risty
Can anyone explain to me why the mid-pipe on certain XR600R/XR650L exhausts gets substantially bigger before attaching to the muffler? In most cases it is actually the same size as the muffler where it attaches. The XR's only mufflers are a great example of this and so is my White Brothers E series muffler. On the other hand you have the more traditional mid-pipe shape from companies like FMF for the same XR600R. The midpipe is relatively the same size from the header to the muffler connection. Even high performance street bikes use this approach so why is it different with the big single? I've been looking at replacing my White Brothers muffler lately because it doesn't have the discs nor the backing plate to make it USFS approved. I've been back and forth between the FMF Powercore 4 and the xr's only mufflers. I was wondering if the odd mid-pipe shape helps the XR's only mufflers flow better. From what I've read the XR's only mufflers are stupid loud and that would warrant a quiet insert for me and thus choking the high flow muffler, right? Also, for anyone wondering- the White Brothers header that was installed on my XR600R is VERY CLOSE to the same dimensions as an XR's only header at both the cylinder and mid-pipe connection.
I just bought a 2012 xr650l and it starts and runs great until about 4000 rpm give or take (I’m guessing) it feels like it spits and pukes. Also when releasing the throttle the exhaust pops and hiccups. I am calling the dealership to ask if they are willing to fix the problem as I just purchased from them yesterday but I am curious as to what the problem could be in case they do not offer to help for my “as is” purchase. I have read a couple other topics on here that talk about the vacuum lines being hooked up to an air cut diaphram but I don’t know what that is. The smog delete has been done on this bike as well as a slip on dg exhaust and the side cover has a bunch of holes drilled in it exposing the air filter. The battery has also been relocated. My question is what jetting should I have at 2000 feet? I am planning on opening up the carb to see what the idle jet and main jet are and if they were even changed from stock. Also if someone knows about the air cut being hooked up to vacuum and can supply pictures that would be very helpful. I know that the smog block off kits just plug the vacuum holes and the air cut usually gets disconnected. Thanks.