YZ timing with WR stock needle?
Posted February 08, 2002 - 11:04 AM
1.) How can I get rid of the bog off idle?
2.) Should I use a different needle to go with the YZ timing?
baffle and airbox lid removed
Throttle stop cut.
Grey wired disconnected
Stock Jetting except 70 main and clip moved one position leaner
Altitude: 7,000-10,000 ft in Colorado
Posted February 08, 2002 - 12:09 PM
Posted February 11, 2002 - 12:58 PM
Posted February 11, 2002 - 01:03 PM
Currently I am running DVB, 4th clip with a 45 pilot and 170 main. I have been running that for a while now. I also am not happy with the 1/8 response. I'm not fouling plugs, but it does bog quite a bit until it warms up.
I have to look it up, but I have information from James Dean suggesting a EKQ (?) needle. Problem is, I can't find it anywhere. I'll forward that info to you if I find it.
Posted February 11, 2002 - 01:19 PM
From one CO boy to another...
Two "to-do's" for you...
1. Do a search out there for the "BK mod". $15 minutes of time and $15 will permanently remove that off-idle bog. Someone has even put Home Depot part numbers for the parts you'll need to do the job! Apparently, the accelerator pump is way overdesigned for this bike. The "squirt" duration should be 0.5 sec or so. Off the shelf they're setup somewhere around 3 - 5 seconds.
2. My buddy has basically the same setup as you and is running: 42PJ/75PAJ/DRR#3/160 main/200MAJ. Really close to your setup except a bit leaner main (all other parts are stock). I'm guessing you're a bit rich on the higher end of things...thus, go down on your main jet. I'm also assuming that the DRR needle is stock in a 99 WR...so if it isnt, let me know and I'll adjust my suggestion accordingly.
2a. MUCH BETTER THAN 2. See my setup below in my "sig". Except for the YZ timing (which I havent had time to complete yet), my bike runs great! A couple of other Denver folks also run the same EKQ needle. Try it...you'll like it! By my best guess (having ridden both my friends and my own bike), the YZ timing causes his bike to pull harder thru the midrange than mine...but not nearly as much as it did before I switched to the EKQ needle. The combination of the two should absolutely rip! FYI...I've ridden this jetting at Rampart (7K - 10.5K ft) and the bike has performed flawlessly. You might want to richen it up just slightly for local Denver track riding (EKQ#4/165main?), but start with what I've got and go from there.
Hope that helps! Drop me a personal message if you want further help...
Posted February 11, 2002 - 01:30 PM
James Dean suggested the following:
I actually am currently at DVR #3, #45 pilot and #170 main.
Hick agrees on JDs starting point. He also suggested we not use the D tapered needle unless we have stock exhaust and airbox lid on.
Both say start with their suggestion. It will give us the get up and go we've been missing. I just can't find the EKQ anywhere.
Posted February 11, 2002 - 01:35 PM
Posted February 11, 2002 - 01:39 PM
Am I crazy? I also think I remember someone posting a similar mod for the 99's. Anyone have more info on this?
Posted February 11, 2002 - 07:58 PM
Due to the different carbs, the 98/99 WR's require the "KL" mod. And I think Taffy has a mod of his own that also works. Check the archives, there's tons of info.
The "BK" mod is for '00 and newer 400/426's. Also tons of info. on this.
Posted February 11, 2002 - 11:39 PM
Posted February 12, 2002 - 06:36 AM
Posted February 12, 2002 - 07:46 AM
I dug through my stuff and found my extra needle jets. Here's the PN's:
OBEKN - 5JG-14916-EN
OBEKP - 5JG-14916-EP
OBEKQ - 5JG-14916-E1
Dont let the fools at the shop tell you that's the wrong part #. Their microfiche is wrong. These three needles are actually still in their Yamaha packaging coded appropriately with the PN's and the correct markings on the needle jets. (I went thru the same headache 3 different times with the folks at the shop before James Dean steered me down the right path...).
I'm actually running an EJQ...which is a Sudco knockoff...and the closest I could get to an EKQ (only 1/2 clip richer). Their brass but do the job just fine...and are cheaper. Another option for you...just get the 1st and 3rd letters correct and adjust for any differences in the 2nd letter by changing your clip position (as long as it's not way off).
In addition, I'm running a smaller pilot jet (the stock 42)...which you might you'll need once you make the change. First, try the EKQ needle with your 45's...and see what you think.
Do the change boys...you wont be disapointed!