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My XS400 "restore"

Discussion in 'The Garage' started by SoulMan, Jul 4, 2018.

  1. SoulMan

    SoulMan XS400 Enthusiast

    I understand what you are saying. With how it broke the float pin doesn't actually move which is surprising but true. I am looking to do a permanent fix of some sort but I havent done it yet. Not considering the float post which else should I check. I suppose I should check that the air jets on the filter side are all open and flowing properly. Just spray carb fluid in there and check for fluid flow out of the corresponding other side orifices?
     
  2. xschris

    xschris a lifestyle not a trend Top Contributor

    Spark, fuel and compression is what you need. You said the plugs are new but dry when you try to start it? Try starting fluid? Can't remember if you have ever said that you have heard the bike run before. Maybe the coil connections to the harness are swapped and it's firing at the wrong time. If the plugs are dry fuel is now getting trough the carbs. What are the needle settings on you jet needles? Should be third from the top. Be careful when taking them out and make sure they are assembled correctly. It makes a big difference.
     
  3. SoulMan

    SoulMan XS400 Enthusiast

    I am getting spark and I could get it to run before cleaning the carb. But I did put in new float needles and of course its possible that I dislodged something in the cleaning process in one of the passages... thinking choke but it did not get out of the body completely. The jet needles are on the 3rd clip down from plastic spacer.
     
  4. SoulMan

    SoulMan XS400 Enthusiast

    Put everything back together and got it started. After I fixed the woodrufd key tarter engaging a but but then it is just slipping.

    Going to get the oil and filter changed is my nect task.
     
  5. xschris

    xschris a lifestyle not a trend Top Contributor

    How where the springs? Check the length of them to make sure they are in spec. Did you align the pressure plate and basket? There is an arrow on them that needs to be pointing the same way or the clutch will not work correctly.
     
  6. SoulMan

    SoulMan XS400 Enthusiast

    I actually replaced the three springs with NOS ones I purchased off of ebay. I did not check the length. I did not take the starter clutch assembly apart so I did not have to change anything with regard to the pressure plate and basket. I could check over it to make sure that if it was messed with previously that it was put back together correctly so I will check on that.
     
  7. xschris

    xschris a lifestyle not a trend Top Contributor

    Sorry, I was thinking about another members post on his actual clutch not starter clutch. If your starter clutch is slipping it could be the housing for the rollers worn or the race they ride on. Any wear at all or miss align will cause slip. Take it full apart to check.
     
  8. SoulMan

    SoulMan XS400 Enthusiast

    I will check it out. I know I have some gaskets that need to be replaced and it is possible to buy a set but I was thinking about cutting my own. If I cut my own what thickness should I buy? Additional is there a specific type of material I should get?
     
  9. SoulMan

    SoulMan XS400 Enthusiast

    Another question. The left exhaust has the crossover pipe broken. Anyone had any luck welding a new crossover to one of the exhaust pipes to make those connections there?

    2018-10-31 09_52_43-1980 Yamaha XS400G Exhaust _ Babbitts Yamaha Partshouse.jpg

    Basically this part is gone so if anyone has suggestions I would appreciate it. I have a stick welder that I have never used (never welded before ever) but if someone has a suggestion/tips for if I can repair that would be great.

    Thanks,
    Scott
     
    Last edited: Oct 31, 2018
  10. Petew

    Petew XS400 True Believer Top Contributor

    Is there any viable, non rusted, surface for a replacement pipe to go over? If so, if you cut vack to that area,you should be able weld it, probably an exhaust clamp at each might suffice. If not you might be able to fabricate and weld a new one, it can get tricky. Be careful that your fix doesn't create more holes. Obviously the repair will be much easier off the bike.
     
  11. BBS360

    BBS360 XS400 Guru Top Contributor

    Same problem on mine. Plugged the holes temporarily but I did buy a V band clamp with the idea of welding it in place.
    -1628645799-1405206122.jpg

    No room for misalignment or it won't seal though. A more flexible option might be better.
     
  12. SoulMan

    SoulMan XS400 Enthusiast

    I wound up buying a left side muffler off if ebay. Next problem. I took the bottom plate off to drain the oil and clean that filter down there and I am not sure how it goes back on. There is an arrow on this part. My intuituon says it goes towards the front.

    15524361190891984493773.jpg
     
  13. xschris

    xschris a lifestyle not a trend Top Contributor

    Yes , but what screen does it have? If you have the later style with the metal band on it that needs to point in a specific direction. I don't think the plate really matters.
    DSC03625.JPG DSC03626.JPG These are much better than the old ones with the weak rubber pegs on them.
     
  14. SoulMan

    SoulMan XS400 Enthusiast

    I have the other one.
     
  15. SoulMan

    SoulMan XS400 Enthusiast

    I just ordered one of the new ones. I have waited this long to put it back together a few more days wont hurt anything.
     
    xschris likes this.
  16. xschris

    xschris a lifestyle not a trend Top Contributor

    If you needed one, I have plenty. Good idea to upgrade from your old one.
     

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