Been building myself a couple of XS motors lately. 277° and 360°. Have had the blocks together for some time – gearbox and crank, new bearings and seals etc.

Got round to stripping down an old XS1 head the other day. Just to check her out. Actually not too bad, some leakage around the top of the inlet valves, guides ok, valve stems straight. Cam ok. Rockers starting to wear a little. Decided to replace them and the shafts as I had a new set lying around and I have a new cam.

First you need to remove the 4 press fit sleeves that seal the outer-headstuds. You can simply bash these out but I wanted to remove the rockers and the shafts sit pretty tight (unlike the SR500) so I popped the rockerbox in the oven for a while.

The sleeves knock out easily with an 8mm socket.

 

 

Then you can get to the rocker shafts. These are tight.The puller I had rustled up for the SR500 wasnt up for the job but still had the longest 6mm thread I had on hand so I simply packed the outside with a socket and an old gearbox bearing and wound the shafts out.

 

 

Total time, less than 5 minutes once heated (if you heat use the oven and not a torch – no point in risking warping the box).

Slapped her back into the oven for a few minutes before inserting the new shafts and rockers. Dont forget to blow out the oil galleries first, and lube.

If wanting to reuse remember to bag and label: left/right, inlet/outlet

enjoy

Can you believe this?

ebay item nr 131068858233 … seller: losser0

 

This is what he has to say …

very rare Yamaha 69 70 71 xs1 head, this is the one with only three bolts on the triangle valve cover over the left side exhaust valve, not a square cover with four nuts but round with three matching the other three valve covers on the engine, this head is in excellent shape, it has been completely torn down chemically cleaned all tolerances checked, the valve guides are in perfect condition,then the valves were lapped and then cleaned again, reassembled and ready to run, does not come with plug in photo,only used to cc combustion chamber after work was complete…. all, and I mean ALL threads are good and has no broken cooling fins, this is a really really hard to find part, and if your looking for one and you found this one you already know that, only a limited production the first few years so there almost imposible to find, much less one a beautiful as this, make offer option is there, but don’t be a NED! im not accepting 3/4 the asking price, thanks for looking and happy rides.

Very rare? … there were 32,069 officially produced

No broken cooling fins? … well I can see 2

broken cooling fin #1 – top left

 

broken cooling fin #2 – top right

 

This is an early one – shown by the oil return dams in front of the intake valves – although one of these has been smashed out.

oil return dam – left intake valve – smahed out

 

WHERE IS THE COVER? This is useless without the cover – see here

No cam. Or rocker gear.

And all for a $750 bargain.  … hmmm – for who?

What the fuck?

This chart is also listed in the ad …

hmmm – what possible good is this without a cam???????????

 

Who the hell is this?

??Dont be a NED??

Who’s the fucking NED here?

losser? – or is that loser? – or tosser?

Take a walk through the Hall of Shame.

But wait!! Another head. Same seller. Again no cover.

wow – a ported head, no cover – you are wasting your money buying this without a matching numbers cover … same as the one above

 

It gets worse. Take a good look. It’s the same head in both pictures. Broken top front cooling fins (left and right). Smashed out left intake valve oil dam.