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  #11  
Old 05-09-2022, 08:04 PM
Moto7man Moto7man is offline
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Quote:
Originally Posted by webmaster View Post
FYI

http://www.lt-racing.com/html/xr250r_s.html

Les and I have been riding xr250s since 1987....

I would go with a J & E piston versus the wossner. Although a Honda oem 1985 xr250r piston 4th overbore is a good alternative ( if it is still available).

Your other option is to pick up a sleeve and piston 80mm from thumper racing to go to 300cc. The cases will need to be split and bored to accept the larger sleeve.



Best pipe back in the day was a white brothers magalloy.
The stock pipe with the baffle removed has good power...

For carb, I would stay away from from cheap kits that use 2 stroke carbs.

Stock cam works best for woods.

Jeff
Thanks Jeff!


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  #12  
Old 05-09-2022, 08:11 PM
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I post a heat gun on the cylinder then put a piece of wood on left side and tapped it lightly with a hammer, then the other side and it broke loose, it took a couple of minutes.






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2011 GG EC 300E, 1994 CR 250R, 1984 RM 250 E, 2022 Ranger 300

"If you stop eating donuts you will live 3 years longer. It's just 3 more years that you want a donut."
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"Dreams are messages from the deep."
-Unknown Sardaukar
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  #13  
Old 05-09-2022, 08:18 PM
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Here is the cylinder,








Crank is in good shape,no excessive play.The crank and the internals are super clean and no debris, no marks, looks new inside.I think this may be the original piston.
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2011 GG EC 300E, 1994 CR 250R, 1984 RM 250 E, 2022 Ranger 300

"If you stop eating donuts you will live 3 years longer. It's just 3 more years that you want a donut."
―Comedian Lewis Black

"I think best when I have a wrench in my hands." Soichiro Honda

"Dreams are messages from the deep."
-Unknown Sardaukar
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  #14  
Old 05-09-2022, 09:03 PM
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That is an oem piston...

Jeff
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  #15  
Old 05-10-2022, 08:27 PM
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Ahh, well I see the problem. They've left the ports out of the cylinder in the manufacturing process! Really quite an omission. Bit of an effort with the rotary tool should fix that. Don't forget to do a crankcase pressure test to make sure they haven't made any errors there as well.

Might want to check the Piston for ring pegs, I don't see any.
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  #16  
Old 05-11-2022, 08:46 AM
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Lol, I wish it was as easy as working on my gasser. But it's not too different.
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"If you stop eating donuts you will live 3 years longer. It's just 3 more years that you want a donut."
―Comedian Lewis Black

"I think best when I have a wrench in my hands." Soichiro Honda

"Dreams are messages from the deep."
-Unknown Sardaukar
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  #17  
Old 05-12-2022, 08:21 PM
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Jeff, fun to see the work that you & Les did. What's the magic of the 250 vs. the XR400?

Obviously, I have not ridden either!

Had an XR200 around at one point though, as I recall.

Jeff
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  #18  
Old 05-13-2022, 11:40 PM
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Quote:
Originally Posted by farmerj View Post
Jeff, fun to see the work that you & Les did. What's the magic of the 250 vs. the XR400?

Obviously, I have not ridden either!

Had an XR200 around at one point though, as I recall.

Jeff
Xr250r is lighter than xr400 and has good power low to mid rpm. It is a long stroke motor, in relative terms. Add an inverted fork with billet clamps and the steering is very taught. Turns sharp and precise with shorter wheelbase and tight steering geometry. The xr250 has a six speed transmission with very perfectly spaced gear ratios. Rear suspension has more progressive linkage ratio. Better over roots and rocks (this I s relative to an mx bike).


Jeff
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  #19  
Old 05-14-2022, 02:59 AM
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I got off my old KDX200 1991 onto a then new XR400. Went ok but felt like landing a block of flats (apartments to you guys). I stalled it and couldn't start it again. That was a blessing. My rattley old kdx had worse brakes perhaps but I wouldn't have traded back for a bucket of cash to ride that 400 again.
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  #20  
Old 05-20-2022, 11:29 PM
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10-4, makes sense. I had a Husaberg FX450, and while great in many ways it is hard to overcome weight issues. It was 15 lbs. heavier than my GG300, but all of it was in the rear. Fine if you only ride smooth flowing singletrack and fire roads - and never have to pick it up! Not so good in the woods!

So your comments help me see where the XR250 would work better.

Jeff
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