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Thought it would be good to have a thread about what some of the more common issues on the YFZ 450R are and how to remedy them. It could be stickied later as a guide for new YFZ owners like me!

Thanks in advance to anyone who contributes!
 

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Issues I know of........Rear axle bearings need to be changed every season if you race..........Keep an eye on frame from plastic rubbing, it will slowly cut through it..........Steering damper is a must have......Shocks need servicing every year or two, or between race seasons..........Watch for wire harness rubbing on frame all over bike, place RTV between harnes and frame at points where it rubs under handle bars.......WATER PUMP SEALS can be an issue, you must change all of them it it starts to leak, always use grease to lube new seals in accordance with yamaha service manual, or seals will rub material of shafts (all bikes)...........You shouldn't get a bog issue unless you buy the vortex, people seem to have problems with that.
 

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Some of the problems I've heard about (and some I've experienced)-- fuel level float coming off and damaging the fuel pump; AIS backfiring (not causing damage, but annoying); the dreaded bog on '14+ machines; and the overall weight of the machine. For the fuel level float, you can remove the pump and remove the float before it breaks, and you'll be fine, but you won't have a functioning "low fuel level" light anymore. I wouldn't worry about it, but some people like having it. For the AIS, most people will delete it, which is really easy. You can either block it off with a homemade block off plate or with a different block off. You can also use the 2009-2013 cable hanger there in place of the '14+ piece. For the bog, the only fix I've seen firsthand is the Vortex controller. I know that Vortex fans (like me) will possibly upset some people with their comments or constant praise for it, but it really does work. I've never had better throttle response. As for the weight of the machine, there isn't really a whole lot you can do that doesn't cost an arm and a leg. Titanium parts weigh less than their steel counterparts, but will cost you a ton... and if you're not racing on a professional level, then it's hard to justify that kind of investment. Even if you ARE racing professionally, it may not be worth your time or money to replace steel fasteners with titanium ones. One problem that I encountered, is the high seat height. I've heard of people lowering the subframes on other machines, but it would be really difficult to do on the YFZR if you wanted to keep the stock subframe. Instead of lowering the subframe, I extended my shock linkage. It lowered the rear a bit and I like the riding position quite a bit more now. I still plan on raising the bars, by way of a taller steering stem (modified stock stem), and mounting my Precision stabilizer, but not in the prescribed mounting position, as I think it looks silly hanging off the side, over the left upper a arm. Another problem I've experienced is the breather issue, which is common. I have an LT-R breather, but I haven't mounted it yet. I currently have a UNI breather up by my steering stem mount, but it pukes a little oil every now and then if I ride it hard for very long. Once the LT-R breather is installed, I believe this won't be an issue for me. The plastics may be an issue for some people, as the earlier plastics left the frame uncovered where your knees hit if you're cornering hard, and I've gone home with black and blue marks because of it. The '14+ plastics remedy this issue, and a couple others, by pushing the front fenders further forward, and the rear fenders are a little smoother to transition from the seat to the fender during aggressive cornering. The machine, in my opinion is very good, and is obviously very capable, as demonstrated by Chad Wienen for the third year in a row. I'd still like to break everything down and see exactly where all the extra weight sits, as my carbed '06 seemed to be much lighter, but I went through EXTENSIVE lightening measures. I'm not prepared to go that in-depth on my new machine. I'd like to compare overall weight and the weight of each component between the carbed machine and the FI unit. Maybe then it would be easy to determine a solution. A lithium-iron-phosphate battery will be considerably lighter than the stock unit, so there's that. Anyway, I hope this helps. Have fun, everyone.
 

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Issues I know of........Rear axle bearings need to be changed every season if you race..........Keep an eye on frame from plastic rubbing, it will slowly cut through it..........Steering damper is a must have......Shocks need servicing every year or two, or between race seasons..........Watch for wire harness rubbing on frame all over bike, place RTV between harnes and frame at points where it rubs under handle bars.......WATER PUMP SEALS can be an issue, you must change all of them it it starts to leak, always use grease to lube new seals in accordance with yamaha service manual, or seals will rub material of shafts (all bikes)...........You shouldn't get a bog issue unless you buy the vortex, people seem to have problems with that.
what are you talking about bro The vortex fixes the bog you need to do your research I have a 2021 YFZ 450R had a very bad bog until I bought the vortex and it fixed it people need to do the research before posting stuff on here because it makes people stress
 

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It doesn't matter if this is 8 years old I am posting it so other people see it and they won't know
Thank you for that, I need all the info I can get. I've been lost up until now. Still lost, but have new directions to head.
Thought it would be good to have a thread about what some of the more common issues on the YFZ 450R are and how to remedy them. It could be stickied later as a guide for new YFZ owners like me!

Thanks in advance to anyone who contributes!
Thank you for starting this. The frustration associated with buying a used unit! Some of the illustrations in the owners manual don't jive with the machine. It's been an aggravation just figuring out how to change the oil. What alien technology came up with some of this stuff? But then again, I've only dealt with two engineers out of many that I had much respect for. Common sence doesn't seem to apply. I've got bog issues, and getting simple solutions seems impossible. The problem didn't occur when the machine was new, otherwise it wouldn't have been able to be sold. There is opinions of purchasing a vortex thingy, but I haven't a clue. I'd like to know what has worn out, so I can either repair or replace. I'd hate to sink countless dollars, then find out it was a simple $2 part...
 

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so 2010 efi, ran great the 1st lap of the race then out of nowhere it started spiting, backfiring. changed the plug, changed the gas tank that had a good known fuel pump in it, still same problem. Any idea's on what could be causing it?
 
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