YAMAFREAKINDOG!! Cold blooded beast!
Posted December 29, 2001 - 10:39 PM
There is NO excuse for a machine to be THAT hard to start in the year 2000 (bike model year). I don't care if it is 0 degrees.
Anyway...any recommendations to do to it?? I read in a few other posts about mabey richening the air screw a 1/4 - 1/2 turn.
This bike is stock. Stock exhaust, stock jets, stock everything. I have mentioned the grey wire mod, and the BK mod to my dad, but he is in no hurry to do anything to his bike. It as it is, is more than enough for anything either of us could possibly do.
The bike is kept in an enclosed trailer, very clean, and well maintained. It is simply a freakin' bear to start in the cold. Like I said...I kicked over my bike twice, she fired right up. Doens't need the choke after about 20-30 seconds either. It's not like a good starting bike doesn't exist...it does. It's certainly not blue though...how about orange?
Again...what can we do to get it to start easier?
Original top end
NO modifications to the machine or it's ignition.
Weather - freezing to slightly above or below, humid. (sometimes in the snow even)
Approximately 500'-1000' MSL.
Also...dad bought some ether. We are going to use that in tremendously small amounts if the sucker doesn't fire.
Posted December 29, 2001 - 01:10 PM
Take a look at this site, www.carbparts.com/keihin/needles_tuning/jetting_your_carb.htm , it may help. I was having problems starting my 02" 520 EXC. It is a California model and the jetting was all screwed up (the dealer didn't have the jets that were supposed to come with it... ). I could barely get the bike to idle without having the idle turned WAY up. After finding that the idle jet was a #45 rather than the #48 listed I changed it to a #48. With this change I could get the bike to idle fine. The needle that came with it, I think a DVR, was really lean so I dropped it 2 clip positions. I just recieved my OCEMN needle yesterday so my jetting days should soon be over.... thanks James Dean. I had just put my new Kouba fuel screw on before I left to ride at Stonyford, if you don't have one you should. Anyway, to make a long story short the bike was still hard to start. Monty showed me this technique to adjust your fuel screw, hopefully that's what your dad's problem is. Crack the throttle about a 1/16 with the motor running. Adjust the fuel screw accordingly until you get the most snappy response. You'll hear the motor cleanup when you get it right. Look at the chart at the website link (jetting your slide carb,)and see the impact the fuel screw has especially between idle - 1/8 throttle.
Posted December 29, 2001 - 01:32 PM
When are we going to get fuel injection anyways? It is going on 2002! Arctic Cat offers it on some model snowmobiles, and it performs very well. Hopefully in the next few years we'll see at least one competition motorcycle with it.
Posted December 29, 2001 - 01:46 PM
The stock pilot jet is appropriate for about 70 degrees. You need to go at least 2 richer (if you have a 42 go to a 48) in the pilot.
Very simple to change. Drain the float bowl, remove the bolt at the bottom of the bowl. Use an appropriate screwdriver and remove and replace the pilot. See the microfiche or your manual for an exploded view.
Once you get that changed out and the beast starts you probably also need to richen up the needle one or two positions (raise the clip which lowers the needle). Search this site for instructions. It's way easy and no worse than any other normal maintenance item.
Jet it properly for the temperature and you will be fine.
Posted December 29, 2001 - 04:10 PM
I also have stock jetting, but I'm changing that tomorrow.
But I have a question, why does a too lean condition cause the plug to foul ????
Posted December 29, 2001 - 06:17 PM
It wouldn't be so frustrating, if my bike didn't fire on the second or third kick....stone cold...but it is truthfully inexcusable to have a 4 stroke loading plugs in cold weather, I'm sorry.
I know my dad would sell his 426 to someone if they wanted it, he's sick of the starting crap, and at 5'6" it's tough for him to get it going at times when it is stubborn.
Anyone have any thoughts as to the ether I mentioned in my original post??
Posted December 29, 2001 - 06:21 PM
Posted December 30, 2001 - 06:10 AM
I rode my 2000 YZ426 Saturday (about 10- 15 degrees), started 2nd kick.
I have 168 main jet, EKR needle (stock) clip 3, 45 Pilot jet (48 pj might be better), Fuel screw 1-3/4 turns out. I did BK mod, about 1 second squirt, so I have to twist throttle about 3 times,then kick (1 should be enought for stock)
Hope this helps
Posted December 30, 2001 - 06:32 AM
Posted December 30, 2001 - 07:09 AM
I have an FMF Powercore IV pipe and FMF recommended going up 1 jet size on both the pilot and the main. I guess the thought is it can breath easier so you have to feed it more. Don't know if this is applicable for the WB E series or not, but some indication that pipes can impact jetting.
Posted December 30, 2001 - 12:21 PM
Posted December 30, 2001 - 12:26 PM
Posted December 30, 2001 - 05:14 PM
Posted December 30, 2001 - 05:42 PM
Whenever I first got my 426 over a year ago...it fouled about 5 plugs in 2wks! The bike was a pain in the @$$ to start! The problem was the check valve on the hose that comes off the gas tank (it is a grey piece about 1/2" long). This valve allows air to come into the tank but keeps the vapors from going out. So what would happen is: on the way to the track in the trailer, pressure would build up in the tank and it couldnt escape, so it forced gas into the cylinder, which flooded the bike before I even rode it! After I removed that piece it was easy to start and now it rips! You also might want to turn your fuel screw to 1 3/4 turns out and turn your idle up, this will also ease starting. Check out my website at http://mx393.tripod.com I have alot of tech articles that will help your bike start easier and stuff that will help a beginner (ex: BK mod...which is very popular on this site, just do a search on it) Oh yeah I am also only 16, so you arent the youngest member on this site LOL! Later,
Posted December 30, 2001 - 05:46 PM
I rode today in 45-50 degree weather with my stock bike and 42 pilot jet. It started on the 2nd kick. You can do it too.
Here is the routine I used today:
(1) adjusted the fuel screw to 2.75 turns out (normal for my bike in 70-80 degree weather is 1.5 turns out),
(2) choke out,
(3) two blips of the throttle,
(4) the normal "drill" (bring to "hard spot" (TDC), with compression release pulled in inch past the hard spot, bring kick start all the way up, then kick it firmly and swiftly all the way through the stroke).
I really should have installed the 45 pilot jet but I didn't.
Posted December 30, 2001 - 10:04 PM
The little woman's XR200 ran great today so I took turns with her and had a little fun anyway...
Posted December 31, 2001 - 05:57 AM
fmf powercore IV, renthal bars, acerbis fuel tank/handguards, devol radiator guards, and new excel rims on the way
Posted December 31, 2001 - 01:31 PM
Posted December 31, 2001 - 07:53 PM
Posted December 31, 2001 - 10:47 PM
I had the same thing happen a couple of times, usually when it was cold out. The first time it felt like just like kicking over my old KX 500 so I gave it a couple of kicks and it fired right up.
Everything returned to normal after the engine warmed up. Since I have started leaving the piston at TDC whenever it is parked in the garage I have not had the loss of compression. I'm no expert but this tells me that if it sits for a week or more with a valve partially open it doesn't seal properly until the engine fires. What do you all think?
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