WR450 ?'s....about vibration and low rpm "hit"
Posted January 04, 2004 - 05:29 PM
I have made no modifications to the carburetor jetting, but I have shortened the throttle stop screw, removed the air intake silencer(actually, I don't think I removed all of the airbox restriction that most people do.), and sometimes use the GYT-R exhaust insert.
1. There is a lot of vibration, particularly in the handlebars. It's especially noticeable on dirt roads, even at low speeds. I compared the feel of smaller bikes(XR100, XR200, TTR125) and they are very smooth. Is the vibration normal for big bore fourstrokes like this?
2. When i try to run at very low RPMs just off idle, the motor is a little held back, but with a very small amount of throttle eased on, there is a quick "hit", making it difficult to find a sweet spot for "putt-ing" when I want to. It makes me jerk backward and forward(enough to be tiring, but not exaggerated enough to be comical) as the engine speed crosses the "hit" point. The higher this bike is revved, the better it runs. It breathes fire from half throttle on. I know this is a competition bike, so maybe it insists on staying above near idle rpms. Is this just how it will be? Thanks for any help.
Posted January 04, 2004 - 06:10 PM
Posted January 04, 2004 - 08:15 PM
My only other mods are the throttle screw and and no exhaust insert.
We just got back from a 25 mile trail ride and it was the first time she really got to stretch her legs. She stands-up at about 1/2 throttle in third but has to be snatched in fourth. I'm still getting used to the bike and really enjoy being able to wheelie through puddles and not have any squirming, the TTR225 just couldn't do it...
I've about 110 miles on my bike in a little over two weeks and like the bike more everytime she hits the dirt.
Posted January 04, 2004 - 08:29 PM
Posted January 05, 2004 - 07:08 AM
Posted January 05, 2004 - 08:39 AM
You may find someone willing to do an even trade. I suggest doing a test ride on a DRZ400 if you pursue that path. The bike feels just like a big TTR125 except it's taller and has lots more linear power. No hit of any kind that I noticed.
Posted January 05, 2004 - 06:51 PM
I think that you just need to get your jetting squared away. This bike is jetted terribly from the factory and I can "putt" around on mine all day long.....that's what I love about this bike. Fix the jetting and you'll be much happier. This bike will cruise slow as good as any XR....order the James Dean kit...you wont be disappointed, I promise!! rekless
Posted January 09, 2004 - 02:40 PM
Posted January 09, 2004 - 02:51 PM
Yeah, these are awesome bikes.
Posted January 10, 2004 - 12:10 PM
My son just went from an XR100 to a YZ250F. He also complained about the vibration. We went to renthal bars with pro-grip gel grips and he says it is much better now. We consider the problem solved. However, there is no doubt that the bigger 4 strokes vibrate more than the "trail bikes".
As for the "hit", I agree with others that have commented. First dial in your jetting. Then if you want, try YZ timing. I loved my WR426 when I went to YZ timing. On my bike, I can putt all day long. I do not think there is anything specific to these bikes that does not allow them to putt around. I ride mostly in 2nd and 3rd gear with stock sprockets. The throttle is touchy in the slow stuff because the bike has a lot of torque, but, you get used to it. With such a big piston and high compression, the bike jumps when you twist the throttle. To me this is an attraction, not a problem. The more you ride, the more you will love it. You just have to get used to being more precise with the throttle. Getting your jetting right will definitely help this learning process.
IMO, do not give up. You will end up loving this bike!! An XR400 does not hold a candle to your bike! They will be lining up from miles around to trade you. Personally, I do not think an XR400 does anything better than a WR. Woods, desert, tight trails, etc..., I think a WR does it better than an XR400. The XR400 has a fan following and they produce alot of rhetoric because they love their XR400s. Personally, I believe if you gave those same people a WR and they took the time to get used to it and dial it in, they would think of their old XR400 as an "inferior" bike.
Posted January 14, 2004 - 11:41 PM