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Old 02-09-2010, 08:57 AM
636squid's Avatar
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Default 2007 YZ250f ?'s

I have a 2007 yz250f, I want to change the oil and filter element in it. What oil do you guys recommend, I've searched the old threads and didn't really find anything so don't flame me. Also it boggs a little when I really romp it at low rpm's. I won't to do a little tuning on the carb. Where is the high low adjustment on the carb. New to the thumpers so be nice. Thanks guys.

---------- Post added at 09:57 AM ---------- Previous post was at 09:54 AM ----------

Also is the tranny fluid and oil the same like in a sportbike?
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Old 02-09-2010, 09:33 AM
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On your carb issues- you may just need to clean the carb out. Have fun, its a pain to get to on the first gen aluminum framed Yamahas (your 250 might be easier than my 450 though). You could start by adjusting the fuel screw in the carb and that might help, don't go more than 2.5 turns out (if you don't have an aftermarket fuel screw you will play hell trying to get to the OEM screw as its tucked way up inside the carb).
For oil use a good motorcycle specific oil. Many people (myself included) use automotive engine oil but they don't hold up nearly as well as an oil developed for a wet clutch setup. I think I'm going to be running Amsoil MCF soon if I can get over the sticker shock. And yes, there is only one oil that lubricates both the engine and the transmission.
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Old 02-09-2010, 09:43 AM
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I have that same bike. I agree with Cowboy on the carb cleaning, I'd start there. I'll have to look as I had the same off-idle bog and we swapped out the main jet. I think I have it written down. You probably want to invest in an aftermarket fuel screw because it is definitely a pain to get to.

I opted to switch to a stainless steel oil filter just because it makes my life a bit simpler. I run Shell Rotella-T synthetic. I know I may catch some grief for it, but it's what I've always ran in the bike and it works well for me. I also change my oil fairly often, as in every three hours or so. I realize it's a bit overkill, but I'd be doing that for peace of mind no matter what brand of oil I ran.

I'm sure you'll get a wide variety of opinions on oil types.
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Old 02-09-2010, 10:40 AM
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Thanks guys, now if it just quits snowing.
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