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took the carbs to church and now I cant get the bike to start

Discussion in 'XJ Technical Chat' started by NikoRx, Mar 1, 2020.

  1. NikoRx

    NikoRx Member

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    Did the oil trick with the compression test, 2,3 and 4 went pretty high up and 1 only went up 5 psi
     
  2. NikoRx

    NikoRx Member

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    How do I remove this properly?
     

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  3. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    Use a screwdriver and bend the locking tab down out of the way
     
  4. NikoRx

    NikoRx Member

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    My lovely girlfriend also recommended that haha
    Here are the dirty pics I promised
     

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  5. Polock

    Polock Well-Known Member

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    i don't see enough carbon on there to raise the compression, doesn't matter now anyhow :)
     
  6. NikoRx

    NikoRx Member

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    Agreed, I guess it must be a bad compression tester?
     
  7. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    What kind/brand
     
  8. NikoRx

    NikoRx Member

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    Otc 5606
     
  9. NikoRx

    NikoRx Member

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    While I’m in the head of the engine and cleaning the carbon, I was also going to lap the valves and replace the gaskets and o-rings. I was also thinking of having the pistons measured and rings checked
     
  10. Minimutly

    Minimutly Active Member

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    Now you've done it! Gaskets and o rings you have no choice in, as soon as you decided to remove the head this expenditure was sealed. I would also add valve stem seals to this list, and any shims you then need, check the exhaust header gaskets as well.
    Just inspect the pistons for scoring, I wouldn't take them off the rods unless you need to. Remove the rings one by one and check the end gap - this is the measure of wear in the rings. If you have someone local by all means measure bore diameter as well.
     
  11. NikoRx

    NikoRx Member

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    Bought the necessary top end kits from @chacal! Thanks for the advice! The bike only has 5k miles on it so I wasn’t really wanting to remove the pistons. I didn’t see any real scoring but will post some pics.

    Learning a lot about the engine in the process, can’t wait to get it cleaned and back together.

    Besides adding silicone grease to the o ring components is there anything I add to the gaskets?
     
  12. Polock

    Polock Well-Known Member

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    if your going to lap the valves, for sure put new stem seals in
     
  13. Minimutly

    Minimutly Active Member

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    See above...
     
  14. Polock

    Polock Well-Known Member

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    i was trying to reinforce your wisdom, if i offended you in some way please accept my deepest apology buttercup
     
  15. NikoRx

    NikoRx Member

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    Yep those came with the kit, I will replace them, just got the valves out today
     
  16. Minimutly

    Minimutly Active Member

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    Lol, no.
     
  17. NikoRx

    NikoRx Member

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    Update: lapped the valves and have beautiful rings on the seating surfaces now. removed the valve stem seals and looking into how to properly install the new ones. Any advice would be appreciated, should I buy a special installation tool?

    Future plans: cleaning the surfaces of residue gasket, having a bike shop measure bores, piston heads, and ring gaps. then replace gaskets and O-rings. Put it all back together, recheck valve shims and tune/sync the carbs and hit the road!
     
  18. Polock

    Polock Well-Known Member

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    [​IMG] wood dowel rod, square on the end, hole little bigger than valve stem, the rim of the seal should fit the bevel
    on the hole
     

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