2009 KX250F NEW BIKE UP KEEP

Redlinger911
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Redlinger911
Edited Date/Time 1/26/2012 10:33pm
i just got a new 2009 kx250fwith the head ported and a 14 to 1 compression ration with high compression piston and i want to keep this thing for awhile so what do i have to do to keep it in great shape
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xnationalwrench 3/21/2011 8:31pm
3/21/2011 8:31pm
I would check with the shop that did the work, they would know how radical the porting (flow) was and what to expect on valve life or valve lash life.
project racer 3/21/2011 8:45pm
3/21/2011 8:45pm
14:1 ? Run the best race gas you can afford.
Redlinger911
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Redlinger911 3/22/2011 1:34pm
3/22/2011 1:34pm
alright any ideas on octane i should run ...
johnnyg
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johnnyg 3/22/2011 2:08pm
3/22/2011 2:08pm
105 min also run a good syn 100% oil and change often.

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Redlinger911
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Redlinger911 3/22/2011 7:30pm
3/22/2011 7:30pm
100% synthetic motor oil....idk i was told to run 10w 40 kawasaki...
ZC35
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ZC35 3/22/2011 9:00pm
3/22/2011 9:00pm
Synthetic oil is not the best choice for your clutch. The best oil is new oil, so hold out on the expensive synthetics and use petrollium based oil but keep it fresh. you dont need 105 octane necessarily, oxygen makes up for octane i.e. U4.4 or Pro 5 which is only 86 octane and that's what the teams in SX running VP use. I have a 14.25 in my '10 YZ250F and I run straight U4.4 for races and 75-25 mix of 110 and pump for practicing. I just pulled my motor apart from getting it ported, piston, cams etc and after 25 hours the piston and valves were spotless. I wouldn't stress over the specs of the fuel but I would worry about what gas you are pouring into it. If it comes in a metal drum it will be more than fine, if you fill your plastic jug up right next to someone's Smart Car, you WILL run into problems.
Redlinger911
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Redlinger911 3/23/2011 7:25am
3/23/2011 7:25am
so what r u saying not to out gas in a plastic container....would it be fine if i ran aviation fuel
ZC35
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ZC35 3/23/2011 7:22pm
3/23/2011 7:22pm
haha yea you can put your gas in a plastic container, im just saying do not run straight pump gas. aviation fuel is high octane but it is not made to be ran at 13000 RPM in a 250cc motor. I would not recommend it.
Redlinger911
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Redlinger911 3/23/2011 7:59pm
3/23/2011 7:59pm
alright ill run sunco race fuel its the only thing we got down here
johnnyg
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johnnyg 3/24/2011 10:00am
3/24/2011 10:00am
I ran 100% syn in all my race 4ts over 10 yrs never had any clutch issues even on the highly abused 250f. Dino oils fine but syns far better
scooter5002
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scooter5002 3/24/2011 12:27pm
3/24/2011 12:27pm
Long story short............... Av gas is made to run in planes. Not bikes. It also has an anti-freeze additive to keep it from freezing at altitude. So unless you are launching a triple in the Andes mountains, don't run it. Have they ever HEARD of moto-x in the Andes? Probably only run on pack mules.
mxb2
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mxb2 3/24/2011 2:21pm
3/24/2011 2:21pm
VP, dragon or renegade are all good fuels! Not cheap but good stuff.
moto314
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moto314 3/24/2011 3:15pm
3/24/2011 3:15pm
I would run min 97-100 oct (motor rated), but there are several variables to consider like the head/ cam mods, type of fuel...

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