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Featured XS400 Bobber build/first post

Discussion in 'The Garage' started by volcomskater77, Oct 20, 2010.

  1. yeah im prob just going to lap the valves and clean out everything else i can in my small engines shop at school. its a deeply mild rebuild. if you know what i maen. im not gonne go crazy on it, just enough to get it running smooth. keeping everything thats good and replacing everything that isnt. lol HT you should do i polishing tutorial...
  2. I would, but you guys don't wanna see my Skippi way of doing it. That, and I look like Death when I'm finished....COVERED in black crap! haha I may try to write-up a little something though!
  3. its a way to do it right? and is works. that what it comes down to. lol
  4. anybody know where to get good sized piston rings? or a car size that fits the same? i found NOS ones online but i have nothing to compare price on. there like 20 bucks is that good?
  5. Travis

    Travis Staff Member Staff Member

    Yeah $20 is a good price for a set for one piston. So they are the stock size? Is that what you need?
  6. drewpy

    drewpy Excess twin

    price sounds ok to me
  7. Any luck on locating rings bro?
  8. yeah ill share the link when i get home. and its for both pistons. it says NOS. so thats a plus i dont know if i wanna share the link tho because its so awesome. lol
    there .25mm. is that the right size? it says 1st oversize piston rings to fit the xs400.
    Last edited: Feb 16, 2011
  9. I'm guessing that if it says 1st oversize, that they are for an overbore application. I may be wrong though..
  10. drewpy

    drewpy Excess twin

    yep, .25 is first overbore, they are not standard bore.
  11. well i can always bore it out. we have the equiptment at school. thats a cylinder hone tho. how hard would it be to bore out and what else would i have to do to it? just new rings right?
  12. drewpy

    drewpy Excess twin

    no, new .25 pistons as well :D
  13. logan

    logan XS400 Enthusiast

    preatty sure if you rebore the cylinders, your gonna need oversized pistons. set the rings inside the cylinders and check the end gap on the rings. you would want to hone the cylinders if your putting in new rings, but honing is not boreing!

    drewpy beat me to it!
    Last edited: Feb 17, 2011
  14. damn ok. thanks guys. there goes that idea. on the search again. haha where did you guys get your rings from?
    and a new update: i bet my boss $100 that i would have it running in time for our little get together. so now i really gotta get my @$$ in gear. haha
  15. Travis

    Travis Staff Member Staff Member

    Volcom, you have to measure the wear on your cylinders with a fancy bore gauge and then determine if you can get by with standard size rings after honing the cylinders. If you can't, then you have to buy oversize pistons and rings and have the cylinders bored and honed to match.

    I'm no engine expert, but that's my understanding. I would just take it to a machine shop that does that type of work and they'll tell you what you need. Then you gotta go try to find the parts.
  16. thanks for the info guys. ill be checking it out and using a bore gauge at school come tues or wed. no school monday!
  17. Chickenone

    Chickenone XS400 Enthusiast

    any updates?? i need new rings too... stock size....
  18. not really. ill be taking in the jugs and the head into skool on wed to clean out and check for wear. should be some updates on wed-friday. depends on when i finish.
    where are you getting your rings?
  19. not an update, but i learned how to run a lathe today. its pretty fun and i will be posting pics of my progress and how ill be using my knowledge for use on my bike. probably a kicker pedal and some homemade Z-bars. (i gotta knurl them somehow)

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