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The xs250 is a tiddler for sure, and while not any kind of whelming, under, over or other- it has options. The xs250, 360 and 400 share the same conrods, cranks and cams. The valves may differ, but i cannot remember by how much, or if by much, if at all. The 250 barrels can be bored out to...

"Also, I've read about putting oil or atf into the cylinder and letting it sit for a few hours to improve the compression, has anyone had luck with that on these bikes?" It can yes. Mix some 2 stroke, a tiny bit of kero and a tablespoon of acetone in about 1/2 cup ATF, and syringe about 1...

Hello, this is a common problem in all IC engines. It is likely not the rings or the head gasket, for reasons, you may already know (the compression is great). Adjust the valve clearances and check the head fastening bolts are the correct specified torque (as found in the factory manual)...

Milling machine. Nice. Would do a beautiful job with that Wohlhaupter. Have you made any big bored xs400s, or do you re-sleeve other engines?

Which years? Year model seems to mean a lot with these. I wouldn't have thought the problem was wether or not straight swaps would be a problem, more, the problems beginning with where the pivots for the suspension are, and if you are taking suspension from a single shock bike or not... And...

How are you machining the cylinders? With a veritcal boring machine or a milling machine?

Yes. A boring head. I will send it to the same shop i send all my boring work. They do cast iron sleeve fitting.

O.k., i think j get it. I have the earlier type engine, than yours. My engine is a single cam, i will have a look at the holes when i do the top end.

When you say series, do you mean single cam, then twin cam? Or '76 to '78?

I have a 1978 xs250 special that i would like a little more HP added to, and i have heard from multiple sources that i can swap the barrels from a 360 onto the 250. Has anyone tried this, and to what degree of success? I have enough experience to make it work. Just ask...

Yes, i am aware of the avalanche of work it presents, but i saves me fabbing a whole frame from scratch, and gives me options not available on some XS650 frames. I dearly love the XS250 (special) i have as it has so many options to tweak out that extra margin of power. Its about thw journey...

So, a noob member here, bit of an XS fan, but have only recently joined the cult. The cult membership fees are less invasive than the HD cult, and the lobby is smaller. Jokes aside, i have been the collector of many badges and hats 👒 😅 and certainly have the skills required for an...