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Old 08-29-2011, 07:21 PM   #781
sion
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Joined: Jul 2010
Location: Hocking Hills
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about a month ago, I boogered up my engine...see here:

http://www.advrider.com/forums/showp...ostcount=39364

today, I ordered the rest of the parts (a wiseco piston kit, a K&L cam chain and the needed but unrelated throttle cables) from ebay. will hopefully be here within the next week...at which point I'll begin reassembly. I'll post up some pics when I do the work.

the top end is easy to work with on these bikes, but I've never had the bottom end apart, so wish me luck.
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Old 08-29-2011, 10:18 PM   #782
Olas
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Quote:
Originally Posted by sion View Post

the top end is easy to work with on these bikes, but I've never had the bottom end apart, so wish me luck.
The bottom end is pretty easy too...just have the manual handy and just don't strip any threads!
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Old 09-08-2011, 09:35 AM   #783
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So, quick question about the clutch side screen filter. I am almost positive that my 2003 XR250R has never had the clutch cover off, so along with that the screen filter on that side has not been checked. It's a pretty low hour bike, only around 1000 miles (PO put an speedo after he bought it new). How dirty will this screen be after break in, and a few oil changes in between that? Should I clean it now or leave it for this winter?

Thanks
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Old 09-09-2011, 04:42 AM   #784
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ok, so I've begun the chore of replacing the holed piston...took the jug off and took it into work to clean up the slight scoring that had occurred. after honing, the cylinder now measures 73.482 mm. the stock size piston I bought is 73mm. the next size up is 73.5 mm. I'm thinking I should get the 73.5 mm piston and hone out the cylinder a little more to accommodate it rather that use the stock sized piston. how big do I want to hone out the cylinder for the 73.5 mm piston?
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Old 09-10-2011, 04:51 PM   #785
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Taken today up at 12,800 ft:



The high point you see in the center of this pic is where the above picture was taken, redcone:



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Old 09-10-2011, 06:34 PM   #786
lamotovita
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Location: WA/AZ, USA
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Wow, my XR gets pretty wheezy at 6000', did you have to get off and push at 12000'?
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Old 09-10-2011, 08:36 PM   #787
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It's a 250 so you can't expect it to be a powerhouse up that high but in first it'll climb anything. The right jetting helps!

122 main, 42 pilot, raised the needle clip by one and fuel screw is about 1.25 turns out.
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Old 09-13-2011, 03:54 AM   #788
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Location: Barcelona - Catalunya
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Can anyone tell me tales about long distance travels on an XR250R?
I recently purchased one of it and I'm tinking to make some offroad travels arround Pyrenees.
There are some photos for you to enjoy!




Salut!
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Old 09-13-2011, 01:54 PM   #789
beat
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i was reading a blog the other dat of people from the uk and drove to south africa on it...
so it shouldn't be a problem
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Old 09-13-2011, 05:41 PM   #790
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Quote:
Originally Posted by sion View Post
ok, so I've begun the chore of replacing the holed piston...took the jug off and took it into work to clean up the slight scoring that had occurred. after honing, the cylinder now measures 73.482 mm. the stock size piston I bought is 73mm. the next size up is 73.5 mm. I'm thinking I should get the 73.5 mm piston and hone out the cylinder a little more to accommodate it rather that use the stock sized piston. how big do I want to hone out the cylinder for the 73.5 mm piston?
You will want .0015 to .002 piston to wall clearance. Since the bore is out of spec anyway, might as well bore it to 77mm and make a 277cc out of it, well worth the effort.
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Old 09-13-2011, 09:52 PM   #791
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You will want .0015 to .002 piston to wall clearance. Since the bore is out of spec anyway, might as well bore it to 77mm and make a 277cc out of it, well worth the effort.
creaky, I much appreciate the clearance numbers...but I'm gonna stick with the 73.5 mm piston for now. I'm already into it for $400 worth of replacement parts as is...I dont really wanna spend more $$ getting it properly bored, then have to work on the carb, etc...for what, maybe 2 or 3 more hp?
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Old 09-14-2011, 06:36 AM   #792
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I agree that since you already have the parts, go ahead with the plan. However, it would be a good idea to mic the bore to make sure that it isn't out of round or tapered out of spec.
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Old 09-14-2011, 03:30 PM   #793
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Anyone have a stock muffler tip laying around that is not in use that will fit a '03 XR250R? Looking for the complete tip set up, if you have one let me know and let's make a deal.
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Old 09-14-2011, 06:44 PM   #794
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Quote:
Originally Posted by Olas View Post
Anyone have a stock muffler tip laying around that is not in use that will fit a '03 XR250R? Looking for the complete tip set up, if you have one let me know and let's make a deal.
I have one I'll give you. You do realize the diameter of the tip is like ........ half an inch! Very restrictive and will probably warrant installing smaller jets in the carb. I'm assuming your bike was jetted for a more "open" exhaust.

If you want it email me at "bruce enns at cox dot net"

cheers
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Old 09-15-2011, 05:52 PM   #795
Olas
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Quote:
Originally Posted by Brewster View Post
I have one I'll give you. You do realize the diameter of the tip is like ........ half an inch! Very restrictive and will probably warrant installing smaller jets in the carb. I'm assuming your bike was jetted for a more "open" exhaust.

If you want it email me at "bruce enns at cox dot net"

cheers
Email sent. Thank you!
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