250-500cc First WR250

Hi Guys

Just purchased a 2013 WR250. Previously, I was riding a Yamaha TTR125L. Whats the best way to break the bike in? Any other tips or suggestions that I should know about as a new owner of this bike? Thanks so much!

30:1 pre mix and pound the crap out off it !!!

Drain the cooling system of the goop that's in there and flush with some hot water, then replace with real coolant. I changed to a 1.6 radiator cap which solved my coolant loss on every ride problem. I think my stock cap was defective. Check your coolant every ride!

Don't do this.


Find a ratio you are going to always use, jet the bike for this ratio and ride the bike. Adding more oil makes a leaner air fuel ratio and we all know what happens when you lean thing out to much.

whats the ratio from the factory?

the factory ratio is sort of a default thing
imagine someone buying oil at wallmart and wondering why a high tech engine failed
buy good oil and never look back, currently Golden Spectro 50:1 considering 60:1

30:1 At break in , read the manual

manuals are irrelavant

dissconnect the negative cable

32:1 i believe. first tank at least!

I have an 09' wr250 ..... I broke mine in on Amsoil Dominator @44:1 and have been running it ever since.... I did install a Keihin PWK carb after about 6 months of constant jetting woes however. So far 2 yrs. of trail riding and about 15 or so Hare Scrambles, still on the original top end and running great.... for that matter I'm still on the original spark plug !!! Never over heated.... never lost coolant... It's a great bike, like any bike it has a few quirks but are easily fixed... One thing for sure, either fabricate a strap to hold the kickstand up or remove it all together (I opted to remove it).....It likes to come down at very in-opportune times ! It's a far cry from your TTR .... Take it easy on the first ride... then let'er rip !!

I created a super high tech, bling bling kickstand strap for my wr. 2 zipties attaching a 1.5" long section of a used front tube works awesome, stretches nice and holds it secure and it doesnt cost anything but a coupla zip ties. Make sure you do secure it tho!
As far as the premix goes, i started with the break in mix for like 2 tankfuls and then went to 42:1. May seem a little thick but it runs awesome, never stalls, and Ive only changed the plug once in 20 hours just cuz Im a stickler for maintenance. There was nothing wrong with it.

I also switched to the Keihin PWK from JD jetting on my 2010 WR I run Belray H1R with 44:1 ratio and no problems. Best rule of thumb on mix ratio is to follow the oil manufactures recommendation

30-1 would be a richer mix as far as the amount of gas to oil ratio. Adding more oil would make it richer not leaner and would most likely foul the plug right away.

in reality adding oil means less gas going through the carb jets, but in the real world unless you are leaned out as far as you dare you will find 32:1 vs 40:1 not as dramatic as it looks and that is a big change
now that sid I always reccomend rejetting after any fuel or ratio change
as to 32:1 is 3% added oil as in not fuel and 40:1 is 2.5% added oil, 32 parts fuel to 1 part of oil,
over the years I have changed oils I remember when 16:1 was the common mix, I went to 32:1 in the 70's, 40:1 in the 90's I am currently running 50:1 and I did rejet as necessary

wow thats some good info. I thik i'll try changing my ratio a little and see how it goes.

Sure what ever you say. I have only being repair mistakes like this for 30 years or so but I'm sure you're correct. Thanks

No reason to have an attitude about it, this is a wide spread misconception and understandable. Would have taken the same effort to explain as it did to be sarcastic.[/quote]



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