All I can say is WOW!!!!!!!!!!!!!! YZ Timing.......
Posted August 26, 2002 - 07:25 AM
OMG, As of Friday night, I've got a completely new bike!! First off, thanks a bunch to Hick for his YZ jetting suggestions!! Without anywhere else to start, I followed his suggestions to a T. I am almost spot on jetting wise, anywhere from 6,000 feet here in Boulder, all the way up to 12,000 feet, which I rode yesterday up to the continental divide. The bike ran amazingly everywhere, much quicker reving, more punch, and doesn't seem like I am missing anything down low (some people noted a little less down low when going to YZ timing). All I can say is AWSOME!!!
Now with new YZ timing and jetting, I've got a full fleged wheelie monster in any gear, it's like night and day. For any WR owners, that may be looking for additional punch from their bikes, I highely recommend the YZ timing. It's easy, free, and can be switched back easily. However, if you like your power smooth, by all means leave well enough alone.
Thanks for everyones input, it all helped in one way or another.
Peace, until next time..........
[ August 26, 2002, 10:26 AM: Message edited by: Dodger ]
Posted August 26, 2002 - 07:34 AM
If you haven't done so yet go forth and do the BK mod. IMHO it is just as easy to do as the timing mod with great throttle snap!
Posted August 26, 2002 - 07:48 AM
EKQ - clip #3
158 Main Jet
38 Pilot Jet
2 3/4 out on Pilot Screw
Spanking clean Carburator
Everything else is stock at this point jetting wise (for whatever all those other jets are). I rode at the same place both Sat and Sun, and have not done a ride around Boulder yet, I will be doing that tonight to see if I'm ok for 6K. When I first installed my carb on Friday night, the new jetting was a bit to lean on the pilot circuit, it wouldn't idle, but pulled hard all the way through WFO. No stumbles or anything. So I kept going out on the Pilot Screw a quarter turn at a time. By the time I hit 2 1/2, she idled fine but still had a little bit of a hanging idle. The 38 PS may be just a bit too lean, if she doesn't run right tonight around town, I'm going to go to a 40 pilot screw to see if that helps. But hey, I road all the way from 8K to 12K and back yesterday, and she pulled almost as hard at 12K as she does at 8K. That in itself is pretty amazing.
So anyone with the need to tinker, this one was fun ..........
Posted August 26, 2002 - 09:21 PM
Posted August 26, 2002 - 11:32 AM
Posted August 26, 2002 - 11:33 AM
Posted August 26, 2002 - 11:39 AM
Too bad you didn't do the jetting and timing individually, then you could report your experience as to which mod did what.
If you don't have a YZ needle your carb settings aren't anywhere near Dodgers. Changing to the YZ needle is the most comprehensive single change you can make, meaning it is a huge difference for just changing one part, a much larger thing than just changing a main or pilot jet size, for example. The only reason IMO your bike runs at all in the summer at higher elevations with such a large pilot (42) is because the stock "D" taper needle is very lean off the bottom and compensates for what would ordinarily be an overly rich pilot.
I am declaring jihad on that weird stock WR jetting.
Posted August 26, 2002 - 11:51 AM
I have been toying with putting the YZ cam jam on my 99 WR but it is just running so strong and is so nimble in the woods I dont want to mess with the whole jetting thing now that Im happy with it you know,,,,.
I am affraid I will lose the great traction the WR has on big, wet rocks, snow, mud, and the predictable power sliding I have on fast dirt roads and sand.
Posted August 26, 2002 - 11:58 AM
Posted August 26, 2002 - 12:36 PM
Posted August 27, 2002 - 04:18 AM
Posted August 27, 2002 - 07:17 AM
I just noticed you have a 400, so I'll take back what I said about the 42 pilot, that may be okay for you, a smaller motor will likely want a larger jet...
Originally posted by endurodog:
I actually have the YZ needle in it.
...and I have no experience jetting the 400 anyway.
Posted August 27, 2002 - 07:45 AM
Posted August 27, 2002 - 07:55 AM
Well, I suppose a valve clearance check is in order soon,,,, sooo, Ill clock the cam and see how it goes. Is there ANY chance of it running ok if I retime it on the jettng I have??? I have not messed with my jetting since I got it diled where I like it about 8 months ago but I belive I have a 170 main jet, and I had to bump the PJ up to a 38 I think or maybe even a 40, I have it wirtten down in my book,,,, I run it between 200 feet and 300 feet with most of my riding between 1500 and 2500 ft.
It would just be cool If I could get a feel for it with out rejetting,,,, but I suppose thats a slim chance,,,.
Posted August 27, 2002 - 08:34 AM
If you got a little time, don't be afraid to experiment a little with your jetting. You've got a bench mark already, and sometimes you just don't know what your missing. I know I was, before the jetting, I considered my bike to be running as well as it could. But man oh man, what at difference just YZ jetting did, let alone the timing.
Posted August 27, 2002 - 10:30 AM
I too have an 01 and have toyed with the idea of going to YZ timing to get a little more punch. I realize I'd have to rejet and am a little reluctant to fiddle with it because it's somewhat dialed right now.
Anyway.....in your opinion, can I use the same numbers as Dodger and expect results or should they be different due to my relative elevation (about 2500 to 6000).
Posted August 27, 2002 - 11:44 AM
Posted August 27, 2002 - 12:33 PM
Changing the cam timing does nothing to affect jetting in my experience. It may change the idle characteristics a bit…
What do you mean when you say your jetting is dialed? My own personal experience with the WR makes me biased, but I’ll say if you still have the stock needle you are not dialed.
The WR comes with, uhmm, strange jetting because of the strangled exhaust and sealed airbox. Once you rid your poor bike of those ridiculous add-ons it is essentially a YZ motor, and IMO then should be jetted as such (100k YZ owners can’t all be wrong…)
Lessee Mojo, at your elevation, and being in WA which is probably as cold or colder than CO I’d say bone-stock YZ jetting or a tad leaner will be a good starting point for you to work from. This would only involve two parts, the stock YZ needle (’01 or newer) and the stock YZ Pilot Air Jet.
What jetting changes from stock have you already made?
Posted August 28, 2002 - 06:45 AM
I did type "somewhat" dialed. I agree this engine has a good deal of untapped power with the stock jetting.
I have a Canadian model. If I can remember correctly, the pilot air jet (?) is different than US and the needle is also a bit different.
Ive only changed the main jet to a 168 from 170 stock and raised the clip position two (thereby dropping the needle to lean it up). I had purchased a US pipe, and ran with the plug in (I like to talk with my 7 year old son when we ride together). I went back to the Canadian pipe, which is much more free flowing than US with plug in. BK mod done also, but without much notable change.
I've always run rich it seems, and was fouling plugs on a regular basis until I dropped the needle. Sounds like if I use Dodger's settings, It should be a starting point.
Is it a major issue leaving the pipe the way it is?