top end

  1. Toro

    Splitting the cases

    I’m posting this in hopes to get some guidance on the matter at hand. I’ve disassembled the whole top end and am slowly getting to everything (boring and installing oversize pistons, checking head and valves for spec/lapping, new cam chain etc etc). The whole shebang. Anyways, while I have it...
  2. W

    Top End Rebuild - What Parts are needed?/What Other Parts should be replaced?

    Hello, This past weekend my 1977 XS650D broke down when I was on a ride where I lost power(couldnt go past 30mph in 5th gear) and oil started coming through the left exhaust. I anticipate this being caused by Piston Rings, Exhaust Valve issues, or a damaged Piston. To determine which and...
  3. JTD1989

    1980 Engine Top End Rebuild

    Hi everyone, I am new to participating in the forum, but I have had my XS for about 4 years and have done a lot of research and learning on many of the great threads on here. I have very little mechanical experience, but I am learning a lot in this process. I bought the bike several years ago...
  4. Surfrat28

    Top End Noise maybe a rod knock?

    Anyone with any advice or knowledge of this sound would help. I have found a video/thread that had the exact sound that I have on my XS650SG. In the thread it was never solved or finished back in 2016. Again this is not my engine in the video, it just has the exact sound that I have. I...
  5. D

    Top end strip, rebuild.. what do i need?

    Hello! i have determined that i have oil getting into the left cylinder when parked up, fouling the plug untl it coughs up all the un-burned petrol and oil in a series of very loud crash, bangs and wallops...! so, i am going to re-do the top end over the next few grey miserable english winter...
  6. B

    Help General top end questions and vm34 settings...

    So I've had my bike running for a few years but it has always had trouble doing more than 60mph. I just tore into the top end because I was ruining plugs on the left side really bad so I thought my rings were shot. that side was oily and the rings might be bad but the cylinder walls seem fine...
  7. Metal

    Top end questions

    Hey guys, So Pulled my head off for the first time since I got this motor. At hi revs I could hear a big tapping sound. I thought it must be the cam guide or the head gasket. I have oil leaking out the head gasket so I figured it was a blown head. Looking at the pictures what do you guys think...
  8. Sub xs650

    Reversing the head

    Has any one tried reversing the head on the xs I'v seen it on some other site what the point and dose it do any thing to help hp or what's up with it and saw some thing about water cooling them to
  9. pnedac

    Bike "burps" after you turn it off...What is that about?

    So I picked up an 83 XS that I am redoing (previously bobbed a 77) into a cafe. It was evident that the PO was trying to make a cool bike with $0.00 and it showed. Black primer on EVERYTHING and the bike did not run. Next day I got it started and took it for a little spin. Smooth through all...
  10. X

    Rebuilding a motor with 20K miles

    Hey everyone, I've been in France for 4 months for work, but I'm home in a little under 2 months so I've started thinking about all the fun things I want to do to my bike. It is a 1980 XS650, btw. Anyways, I rode it around before I left and it runs great except for aluminum bits in the...
  11. M

    Mixing 78 top end with 82 bottom end

    Purchased a '78 xs650 with a bad bottom end. was given a '82 donor motor with a bad top end. I mated the good '78 top end with the '82 bottom end and did a back yard rebuild. After running the half assed rebuild for a couple weeks I decided to bite the bullet and take it in to get rebuilt...
  12. pnedac

    Rebuilding top end, rocker arm sticks a bit, is that okay?

    XS650s are the best! So I am rebuilding a barn find. I have the engine taken apart and I see that one of the pistons needs replacing. One of the rocker arms (exhaust side) for it sticks if you push it all the way back, but not forward. None of the other rocker arms stick at all. Do you think...
  13. B

    ATU reasembly

    i am working on putting my bike back together after a teardown and following the manual pretty closely i am at the atu shaft and bob weights and they say that the arrow goes out (which mine does) and that the mark lines up with the corespnding bob weight i do not see any marks on the...
Back
Top