New 05WR450F, What Mods, What's Air Induction, and Descrepancies
Posted December 27, 2004 - 08:02 PM
The exhaust is internally restricted. Do what you want with the tip, it doesn't matter. There is a 1" hole going into the spark arrestor chamber. If you want airflow, get a new muffler.
There is no fuel screw and the jetting section is ommitted from the manual. I tried to install a zipty screw and found a plug on the carb bowl. I checked the manual and cannot find the fuel screw in the parts breakout or the carb assembly section. I will remove the bowl tommorrow to verify this. How can you FINE tune/adjust the jetting up to 1/4 throttle? Does Yamaha expect us not to jet or does this new air injection system help with the mixture.
What does this new air induction system do? It goes from the air box to the exhaust and also just after the carb. I thought it was just to dulute the exhaust for CA emissions green sticker. Thanks CA, our air is to thin in CO and we need all the airflow we can get. Could this somehow mechanically adjust jetting by adding air to the mixture after the carb? It is only mechanical not electronic.
Does the grey wire mod apply? There seems to be a rev limitation even when in 5th gear wide open.
Wich brings me to the throttle stop. The throttle seems to move a lot. I will open the throttle section of the carb and verify if the stop needs to be cut. However, currently the bike seems to cut out or chug just before I reach wide open throttle. Must be cdi rev limiting.
Lastly, this is an off road bike. What's up with the lights on all the time? Need to sell a few bulbs? A switch will fix that in a hurry.
I like the bike. It has lots of torque at the low end <1/4 throttle. More powerful than the wr 250. However, in a straight away, mid range and top end, the 250 would win since my WR250 could rev up. At 1/4 throttle the bike starts pushing against the muffler. I also like the 1st gear for short, technical control. It will be a great woods bike because of power delivery. I just wish it had more power to deliver from stock.
Posted December 27, 2004 - 08:54 PM
Posted December 28, 2004 - 09:58 AM
The point of my post was what mods are applicable. I am heading to the garage to check out the carb, plug color, and throttle stop. The bike is officially broke in.
Posted December 28, 2004 - 11:14 AM
Posted December 28, 2004 - 11:45 AM
Posted December 28, 2004 - 01:47 PM
Posted December 28, 2004 - 02:01 PM
Posted December 28, 2004 - 02:11 PM
Posted December 28, 2004 - 08:18 PM
Posted December 28, 2004 - 10:55 PM
i've heard about the grey wire.is that the ignition wire and if so does it make a difference?and how?
If not mistaken, the gray wire retards the timing.
Posted December 29, 2004 - 07:36 AM
The exhaust can be uncorked by removing the six bolts that hold the end cap on and then remove the 4 bolts that hold the outlet pipe and SA in place. Throw the outlet pipe in the trash and put the SA back. Then get a JD jetting kit and rejet following the instructions(you'll get an adjustable needle in the kit).
So basically if I get the jet kit I can toss the whole internal sound baffle out?
I figured this was probably the case...but didn't want to lose bottom end grunt just in case. Guess Ill have to get around to getting that jet kit.
I did try to drill out the baffle like on the 250 FAQ. But it wasn't gonna come out. (And yes...I did completely drill out the rivits.)
Posted December 29, 2004 - 11:04 AM
Posted December 29, 2004 - 02:00 PM
Posted December 29, 2004 - 02:28 PM
kawi did the same thing with the klx300 needle, and the plug covering the fuel screw. most street bikes (my bandit1200, my gf's xt225, my old klr650) have the same deal, non-adjustable needle and plug covering the fuel screw. i don't believe that ktm has done the same thing (but i don't have a ktm 4-stroke, so i'm not sure), and i have no idea why that would be.
What's up with this silliness from Yamaha?
the 'air injection' was also on my bandit. another way for aftermarket companies to make a buck by selling blockoff kits. sigh.... The logical next step will be annual emissions testing and some guy will inspect to make sure the plug is still covering the mixture screw, etc....
Posted December 29, 2004 - 02:35 PM
The logical next step will be annual emissions testing and some guy will inspect to make sure the plug is still covering the mixture screw, etc....
How dare you speak such blasphemy!!!!!!!!!!!!!!!!
Posted December 29, 2004 - 05:36 PM
Come on let them know you never get in to the upper rpms. You need the low end to have as much torque as you can get. Then you'll have a great time with the bike. It needs to be set up like a trials bike. By the way it is raining here today, and I still haven't gotten the water pump parts yet.
Posted December 29, 2004 - 06:25 PM
For the guy who could not get the insert out. I just removed the insert out of the pipe. After the rivits are drilled out, I used a needle nose vise grip and a hammer. You have to pull it straigt out in the direction of the exhaust. It is in very tight. The bike wasn't significantly louder with it removed but it did run better. Haven't tried the no tail pipe for fun.
On the throttle stop, thanks for the warning. I almost forgot about the stuck problem. They completely cut off the stop on my old wr250 and I had to order a new stop. I will warn my dealer since they grabbed the bike from another dealer for me. I have a YZ stop on order (arriving next week) and am careful not to pull the throttle hard at the end. Per Parrot's jab, I normally don't wack the throttle so I am ok.
I was wrong about the muffler. I looked in the arrestor chamber in daylight and saw that in addition to the 1" hole at the start, there is a 1" tube that runs on the bottom and is open at the rear of the chamber (rear of bike). So it is not as restricted as I thought.
After finally deciding that I am not going through deep water and to remove the snorkle. Of all the silliness, I cannot get the snorkle out past the battery clip. I have the battery out but am afraid to crack the plastic box that holds the battery.
The bike is responding much better with the mods. (grey wire, throttle stop, exhaust restrictor). I may even leave the stock exhaust. The bike will be great for mountain trails and when it gets up in the high altitude, there should be enough excess power to go where I want.
Posted December 29, 2004 - 08:46 PM
Posted December 29, 2004 - 10:01 PM
If I am not mistaken, this is the first year the WR has been a green sticker...
Actually, the 03 and 04 WR450F are the ONLY years to not be green sticker. Its funny how they have to make it emission legal for an "off road competition" motorcycle. I wonder when they will start cracking down on NHRA
Posted December 29, 2004 - 11:14 PM