halfbreed4lyfe
XS400 Addict
thanks the encouragement is much appreciated. I'll update you with pics and questions as they come.
-
Enjoy XS400.com? Consider making a donation to help support the site.
XS400.com receives a small share of sales from some links on this page, but direct donations have a much greater impact on keeping this site going.
What just happened, one cylinder?
- Thread starter halfbreed4lyfe
- Start date
Part of me is excited for you - you always remember your first tear down...
It sucks not riding, but sometimes wrenching can be almost as much fun. And then riding afterwards is like nothing else, cause you know you did all the work yourself!
It sucks not riding, but sometimes wrenching can be almost as much fun. And then riding afterwards is like nothing else, cause you know you did all the work yourself!
Drewcifer
1976 XS 360 Maniac
I kind of envy you too. The first tear down, everything is someone elses fault.
The second one, all the wrong things are YOUR Fault! LOL.
Enjoy the journey. It will be a lot of learning and fun. Take breaks, sleep on it if you're stuck, get rest.
Drewcifer
The second one, all the wrong things are YOUR Fault! LOL.
Enjoy the journey. It will be a lot of learning and fun. Take breaks, sleep on it if you're stuck, get rest.
Drewcifer
halfbreed4lyfe
XS400 Addict
well removed head today, but that is as far as i got for today, real mess in there.
when i turne the exhaust over a bunch of metal chunks came out. I dropped one washer from the head bolts into the came chain space. I'm guessing I'll be taking apart my crank case anyway however with all this missing metal. What are your thoughts on the rebuild?
I say so far I need a new head to valves and a new piston.
when i turne the exhaust over a bunch of metal chunks came out. I dropped one washer from the head bolts into the came chain space. I'm guessing I'll be taking apart my crank case anyway however with all this missing metal. What are your thoughts on the rebuild?
I say so far I need a new head to valves and a new piston.
pictures way too small to see any detail 
halfbreed4lyfe
XS400 Addict
I'll fix that on mine the pics show up huge
halfbreed4lyfe
XS400 Addict
Last edited:
halfbreed4lyfe
XS400 Addict
Any advice on removing the block? Sealed tight. I've been using a rubber mallet no luck though.
Drewcifer
1976 XS 360 Maniac
Drewpy was right. Holed Cylinder! OUCH! That sucks monkey nuts.
Luckily these engines and parts are plentiful.
Re the washer in the lower end. See if a magnet can fetch it out. if not then remove the oil tray and mesh screen and reach up in to see if the magnet can reach it there.
Drewcifer
Luckily these engines and parts are plentiful.
Re the washer in the lower end. See if a magnet can fetch it out. if not then remove the oil tray and mesh screen and reach up in to see if the magnet can reach it there.
Drewcifer
halfbreed4lyfe
XS400 Addict
Little liquid wrench got the block off in 20min, but really not wanting to open up a crank case, will I be able to just flush it. @drewcifer I tried the magnet from the top with no luck I'll give it a go from below.
more pics
cylinders dont appear to have any scratches, right piston seems fine, thats all I can tell. Oh and that valve is missing completley
more pics
cylinders dont appear to have any scratches, right piston seems fine, thats all I can tell. Oh and that valve is missing completley
you'll have to split the cases, its too risky with all that alloy that will have found its way through the piston.
I reckon the valve head snapped off and then forced its way through the piston head, that valve must be in there somewhere
I reckon the valve head snapped off and then forced its way through the piston head, that valve must be in there somewhere
halfbreed4lyfe
XS400 Addict
so question would it be easier to replace the entire top end/engine seeing as i have no clue why the valve pushed its way through the piston in the first place?
easier to replace the whole engine.
there's more detritus down below I bet ya!
there's more detritus down below I bet ya!
halfbreed4lyfe
XS400 Addict
Thanks for all the opinions and advice all, time to ponder.
halfbreed4lyfe
XS400 Addict
how universal are the x2 engines from year to year and model to model,? can a 79 go into an 80? or seca into a special.
halfbreed4lyfe
XS400 Addict
I posted a thread about a shop in wisconsin that started specializing in cafe racers, well they have this engine for sale on ebay. Would it fit the 1980 xs400 special?http://www.ebay.com/itm/YAMAHA-82-XS400R-XS-400R-ENGINE-MOTOR-/230718502867?hash=item35b7e4f7d3&item=230718502867&pt=Motorcycles_Parts_Accessories&vxp=mtr#ht_500wt_1288
The ebay engine is a DOHC from a Seca or a Maxim. I believe that they fit different in that the engine is an integral part of the frame instead of sitting in a frame like the SOHC models.
I think any 400 SOHC could be swapped for another though, but wait for confirmation on that from someone who has worked on the SOHC.
halfbreed4lyfe
XS400 Addict
Thanks Lou, I just read another article showing that it was a dohc also.
You're welcome.
Something like this, a little closer to home, might be the thing to look for. You could make back some of the cost by selling what you don't use piece by piece.
Good luck.
Something like this, a little closer to home, might be the thing to look for. You could make back some of the cost by selling what you don't use piece by piece.
Good luck.
halfbreed4lyfe
XS400 Addict
So if I replace the entire head and its internals(valves etc.), + the piston + clean out the crank replace gaskets and seals should I be fairley set minus timing issues and fine tuning.
