1993 Honda XR 250 R Full Restoration
 

Another build coming along. I was wanting something more simple for extremely tight wooded single track. Low seat height, air cooled no radiators, smooth power, low maintenance and super reliable.I have had the YZ400 F, CRF 450s etc but I am really a two stroke guy so I am not so sure how this is going to work out.

Here is the old girl, she has been in storage for a long time. She turns over but won?t start. She has spark,fuel but the compression is too low,50 PSI per my gauge. So, I am going to start by pulling the head,cylinder for inspection, then send out head,cylinder to be bored for a new Wossner piston and all new Honda gaskets.I think the subframe and foot pegs are a little tweaked as well.Yikes, look at that stock silencer?. it?s as big as a boat anchor.

https://i.imgur.com/U7rVGgRl.jpg

https://i.imgur.com/qMwdNlSl.jpg

https://i.imgur.com/5bz086ol.jpg

I do enjoy your restos. I might struggle with the subject matter having valves and cams, but will see the transformation as what it is I bet.
RM still looks great lurking in background.

Thanks! I am struggling with the valves and cam stuff too.

Ok, I per her at TDC per the Honda Manual and removed the valve cover confirmed the timing marks on the cam sprocket were lined up. Here is a picture of the inside of the valve cover, everything looks good. She looks really clean inside, no metal, oil had drained out clean.
https://i.imgur.com/xWqpyoQl.jpg

Here is the head at TDC, It?s very clean, I have to check the valve adjustment, .1 mm on intake and .12 on the exhaust.
https://i.imgur.com/AET63Dhl.jpg
https://i.imgur.com/kQIiUTwl.jpg

I went ahead and removed the sprocket cam bolt, then rotated the crank 180 degrees and removed the other sprocket cam bolt, then removed the cam sprocket and the cam shaft and bearing noting that the sealed side of both bearings face outward.

https://i.imgur.com/xf3t5ySl.jpg
Everything going along well and I removed the head bolts and head.
https://i.imgur.com/JzRp8yml.jpg

The piston didn?t look too bad, it is a Honda KT1, but I don?t see an indication if it is a std, a .25 or a .50.
https://i.imgur.com/JzRp8yml.jpg

Here is the piston,

https://i.imgur.com/YQg4Nkul.jpg

Side shot of the cylinder,
https://i.imgur.com/qXlSGiul.jpg

This is where we are so far, however I have a problem, I have removed all the head bolts without a problem, it is a mix of 12mm and 8mm but I cannot break the cylinder loose. Does any one have any ideas?

https://i.imgur.com/SN778Bdl.jpg

Double check all the bolts are out and if so a CAREFULLY place block of wood and a few taps with a hammer will break the gaskets hold. Those stock Honda gaskets get a good bite in over time on air cooled motors. But make sure you try to not hit the fins as they are extremely brittle.

Extreme Violence.

Worst that can happen is that you will give the ghost of Soichrio a double hernia. And that prick kinda deserves it.

LOL,maybe?

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