Off my WR426 and onto WR450 - 1st thoughts and Qs
Posted August 28, 2003 - 08:07 PM
My 426 was YZ timed, jetted, blah, blah, and was fast out of the hole and on the top end. Way fast, with a big hit to get you there, too.
The WR450 feels... sluggish. There is no hit. It is weak down low and the top end is not impressive. Going 20mph on the 426 I could be in 2nd, 3rd, 4th, didn't matter and wheelie with a twist. On the 450 I have to be in the right gear or no dice. Even then it's harder. However, I can climb a hill incredibly slow on the 450 and NO STALL. The 426 couldn't brag about that. It stalled if you looked at it funny.
I'm also having a problem while I'm putting around and suddenly give it full throttle. The bike chokes, almost dies, and then picks up and goes a second later.
I need to talk to the original owner to figure out exactly what jetting and other mods he did, and then I'll get back to you guys. I expect some help here, too. Everyone got a good giggle out of my burning motorcycle story; that should be worth some free advice. I gotta get this bike hopped up.
Posted August 28, 2003 - 08:12 PM
Posted August 31, 2003 - 06:16 PM
I had the YZF cam installed, installed a power now and
cut the grey wire -it gets up every hill my modified 98'
KX500 did! It also easily pulls 5th gear wheelies. Enjoy!
Posted September 01, 2003 - 05:22 AM
I changed the jetting and cut the grey wire and put in a ProMoto exhaust baffle. I also removed the intake baffle in the airbox.
The bike is very fast and starts easily.
Guys who need big horsepressure use YZ parts.
I think I would buy the JD jetting kit.
With 2 hours of work the bike will really run.
Posted September 03, 2003 - 09:33 PM
So, couple questions:
(1) Quick goose at low RPM kills the motor. Any suggestions?
(2) If I take the PMB insert out I get a ton more power. Am I really going to have to give up that much power to keep quiet OR will the effect lessen with a properly jetted motor?
(3) YZ timing... worth it? I understand you have to buy new cams. It seems as though folks change the exhaust... what about intake?
(4) What mods am I missing?
I miss my 426.
Posted September 04, 2003 - 01:51 PM
Posted September 04, 2003 - 01:52 PM
Posted September 05, 2003 - 04:19 AM
Posted September 05, 2003 - 10:08 AM
Do yourself a favor. Hold off on the cams and other aftermarket mods, let's get your bike running great stock and then move on from there....
You only live 40 minutes away from me so stock jetting should work for you too..
Jet you bike like this:
clip" 4th (middle)
airscrew 1.25 out
While you're at it change the plug and totally clean out the carb......
If that doesn't work unplug your TPS and see if that helps...
If you need any help doing this, feel free to bring your bike over to me, and we'll get it perfect...
Posted September 05, 2003 - 11:03 AM
Re: your exhaust... is it 96db legal or not?
I've got the stock jets... thought about that. Everyone seems to like the JD kit as well. I can live without the 426 hit, but I can't live with it stalling everytime I jump on the gas. E-starting is hard as well. A good kick works fine every time. Perhaps the E-start isn't as fast? Thanks for the advice and the offer to help. I've never changed jets...
Posted September 05, 2003 - 01:04 PM
Nope.... If you need to get to 96, get the PC496 or the FMF Q....
your exhaust... is it 96db legal or not?
Please don't fool yourself with the performance of your bike..... Your jetting is jacked up!! Your estart is suffering because of it.. Trust me, I've been through this with my dads 450... Just jet it STOCK like mine!!!! You'll thank me!!!!!!!!!
I've got the stock jets... thought about that.
JUST DO IT!!!!!!!!!!!!!!!!!!!!!!!!!!!
Stock the bike is poorly jetted and choked up.
Not my bike Beezer...... My bike came perfectly jetted and didn't come with a grey wire or throttle stop, just a lame Canadian exhaust sys.
Posted September 05, 2003 - 06:25 PM
Posted September 06, 2003 - 01:13 PM
Any other ideas? Given the shape of my body, and the thickness of my wallet, I don't appear to be either lean or rich.
The top end seems a bit sluggish still. 1/4 - 3/4 are awesome, but that last 1/4 (really 1/8) seem to roll on slowly. I just came off a yz timed 426 though, and it could be that that's the way the WR450s come. Any other WR450 owners have the same experience?
Posted September 07, 2003 - 09:04 PM
Do yourself a favor and buy the JD jetting kit. The JD kit is worth the money. His needles are the shizit! From off idle to the top they rock!
Also the BK mod doesn't apply to the WR450. The carb is new this year and differant. You might try turning the acc. pump adjusting screw clockwise a half turn. This will delay the squirt just a little and let the slide open a hair more before squirting.
Posted September 08, 2003 - 08:07 AM
JD kit is on the way, and a ZipTy fuel screw so I can fool around with that a bit more easily.
From what I understand, the accel.pump squirt is supposed to hit the slide just as it begins to move... can anyone confirm that?
Last Q for now... Is it possible to get enough air with the battery in place (and the insert removed)? I've seen 'interesting' mods with holes in the side covers, or replacing the battery with a smaller one, but I'm not going to do that if I don't need to.
Posted September 08, 2003 - 09:39 AM