WR450 For Ice Racing?
Posted September 23, 2005 - 07:53 AM
Posted September 23, 2005 - 12:09 PM
And with the lighting coil in the wr you can install heated grips. Bonus.
Posted September 23, 2005 - 01:46 PM
yzman400's suggestion of a larger starter jet is probably a good idea. I'll probably try a 72. Not sure by how much I will raise my other jets. Probalby 170-172 MJ. The rest, not sure. I'll have to see when I get there. Really looking forward to it.
Will you be running oval? Road Course? Trail? If you are planning on building a proper set of ice tires, it's a lot of work. I built a set for my wife's XR last year and it probably took me about 16-20 hours (I went with long screws and liners on the inside). I messed up the front tire, so I have to make a new one this year, which I will use on the WR.
Enjoy! I tried last year for the first time and I'm hooked!!
Posted September 23, 2005 - 04:12 PM
Posted September 27, 2005 - 11:10 AM
What is involved in studding tires? I was just going to find a cheap set and screw some studs into them? Any suggestions?
Posted September 27, 2005 - 01:28 PM
Here one from the DR side that is pretty good:
From the WR side:
There is also a lot of info on the YZ side too. If you search, you'll find info about setups from people how just want to get on the ice with sheet metal screws from Home Depot to the pros that build tires with liners approved screws (Holiday Screws, Kold Kutters, Gold Screws) and then you get the crazy ones like Frostbite (before getting his Kimpex rear track conversion, he was using snowmobile studs)!!!!
Posted December 22, 2005 - 04:00 PM
Posted December 22, 2005 - 10:20 PM
Has anyone ever used their 450 for ice racing? How did it do/what mods did you do?
Most important mod you NEED to do is jetting.
I have Akrapovitch silencer with noisekiller and Twinair filter with Twinair cage (this is not a paid commercial but needed information why my bike is jetted like it is)
I use normally #168 mainjet but when iceracing I go up to #170 I also use DUS needle, you might need to rise it up a groove from normal setting. Slow jet is #52. What I did is I went to dyno to get jetting right at the spot and then you need to go bit richer because cold air has more oxygen.
Biggest problem usually is when after a long straight with full throttle you slow down for a corner. Engine goes lean on idle and .....
So you need to be sure that idle is rather bit rich than lean. Also while in dyno ask the operator to run needle mixture profile. 1/8 throttle, 1/4 throttle, 1/2 throttle etc. then you now that engine would not be lean.
One big thing with 4-strokes is that you warm-up engine before going on racing. People here are actually installing/using thermostats to get engine temp high enought. You can also try to covering radiators.