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9 posts in this topic
I'm having a mental debate on whether or not to pick up a Gnarly and Turbinecore 2 for my YZ250x. I want more lug and chug, and plan on getting the RK TEK head as well as an exhaust kit. First I wanted a quality exhaust set up to boost the power across the full rpm range, while having a spark arrrestor to keep woods riding legal and safe. I'm getting mixed messages about the power gain(or lack of) from this combo. FMF Stated on the phone and email that "There is no gnarly specific to the YZ250X and it is the same as the pipe for the YZ250. However the Turbinecore 2 is specific for the YZ250X to work with the back pressure generated by this motor." So essentially my understanding is the gnarly would be a zero sum gain, just a tougher and shinier pipe, but the Turbinecore 2 would be a gain. The tech then went on to say I would get a power gain across the entire RPM range with the Turbinecore 2, but wouldn't say whether or not the Gnarly was any better than stock. Running a Lectron which is dialed perfectly for the bike, and overall the 250x package is fantastic just want some more grunt down low.
Looking for individual experiences so far with exhaust changes on the X.
By Matt Feldbauer
Hey guys so i have a pretty interesting scenario going on here. I got a used kx65 on craigslist that needed the bottom end rebuilt, couldn't really hear it run because the knock from the crank and bearings was so bad, so i replaced the crank, bearings, seals, and gaskets. (In my college apartment living room) Bike started in a few kicks! Here is where it gets interesting It starts up totally fine but anything past idle, it really spits and sputters, and past half throttle it wants to cut it out completely. I tried cleaning the carb once, checking the plug and it looks to be burning fine, adjusting the clip position on the needle jet up and down both ways, new gas. Could it be possible the top end would cause that? I did put the old piston in it but it didnt have much sign of wear, but I could be way off. Or is there some stuff I should try first again? Cleaning the carb again? Im open to any and all suggestions! Not willing to give up now, its so close to being done! I have rebuilt quite a few bikes now, 4 and 2 stroke so i have a decent amount of fix it know how, just really stumped on this.
I have a 2003 crf450r and when I got the bike it came with a white brothers carbin pro exhaust and was told it came from a 250f. The SS pipe mount between the muffler and header pipe does not line up without making a bracket but everything else fits.. The muffler mount ended up breaking and looking for a new one to put on now but bike specific ones are through the roof in price.
Does anyone know what 250f year might be the one I had so I know what to look for. Or any years compatible. 450/250 to a 2003 450f
I've read the page for compatible 450s saying 02/03 header the same and need full exhaust to run 03/04.
WOW, I have missed the community during the upgrade, but I am glad we are back up and running. I am in the process of replacing the top end on a YZ125 and going over my CRF250r and replacing all the items that need to be replaced.
Let's get back to the CRF. The right muffler had a big dent in the cone tip, enough that it was driving me crazy, so I bought a used one off Ebay to replace it. When I installed it, I noticed that the diameter of the hole was much smaller than the left muffler. The guy who sold it to me said it was pulled off an 07 CRF250r, just like my bike.
So, is the right muffler hole (at the end of the muffler) smaller than the left one? I just want to make sure I was sent the right one.
Here are some pics of the new one installed.