Featured Tiger 90 Rebuild

Discussion in 'Vintage Classics' started by Sir Clip, Feb 6, 2022.

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  1. Sir Clip

    Sir Clip Senior Member

    Jan 8, 2022
    853
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    Exeter
    Filled the primary cases with about half a pint of ATF.
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  2. Sir Clip

    Sir Clip Senior Member

    Jan 8, 2022
    853
    143
    Exeter
    A can of Alaska white paint arrived today. This is for the front mudguard and fuel tank both of which have large patches where the paint is missing.
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  3. speedrattle

    speedrattle Senior Member

    Feb 19, 2021
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    appalachia usa
    what kind of ATF?
     
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  4. Sir Clip

    Sir Clip Senior Member

    Jan 8, 2022
    853
    143
    Exeter
    Here is the bottle of Automatic Transmission Fluid that i used. It is a cheap non-branded item, but it does the job of keeping the primary chain lubricated. Many years ago i used to use engine oil, but today modern engine oils are full of anti-friction agents and too slippery to use if they come in to contact with a clutch.
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  5. speedrattle

    speedrattle Senior Member

    Feb 19, 2021
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    the dexron 3 formulation is a common solution. i dont know where you are but the original ATF recommendation in america for wet motorcycle clutches was for Type F, specified for ford products a long time ago. but dexron/mercon/universal fluids seem to be the norm these days in many auto applications.

    i have a norton i bought with anonymous ATF in the chaincase, which i am going to replace with Type F as soon as i get around to it. the clutch is very grabby with almost no ability to slip, and im wondering whether the Type F will solve that problem
     
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  6. Sir Clip

    Sir Clip Senior Member

    Jan 8, 2022
    853
    143
    Exeter
    Interesting. I’m in the UK so imagine that ATF products would be similar to those in the USA. I have this in the primary case of two other bikes and the clutches are all right with it. Let’s see what the clutch on this bike is like when it is running (soon i hope!).
     
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  7. darkman

    darkman Crème de la Crème

    Oct 26, 2015
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    Castrol TQF works fine :)
     
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  8. speedrattle

    speedrattle Senior Member

    Feb 19, 2021
    1,099
    243
    appalachia usa
    interesting:

     
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  9. Sir Clip

    Sir Clip Senior Member

    Jan 8, 2022
    853
    143
    Exeter
    I am working on the front mudguard carrier today. The bolts came apart, but are too rusty to be put back on. The carrier has some extra bends which need straightening.
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  10. Sir Clip

    Sir Clip Senior Member

    Jan 8, 2022
    853
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    Electrics today. The rectifier is dead (it’s shorted out internally) and the zener diode looks bad but can’t be tested properly until the engine is running. The best option is to replace both with a modern solid state rectifier-regulator.
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  11. Sir Clip

    Sir Clip Senior Member

    Jan 8, 2022
    853
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    Nearly wired up.
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  12. Sir Clip

    Sir Clip Senior Member

    Jan 8, 2022
    853
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    Exeter
    #292 Sir Clip, Aug 15, 2022
    Last edited: Aug 16, 2022
    Straightened the front mudguard and its carriers. Test fit on the bike to check all is good before painting starts.
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  13. Sir Clip

    Sir Clip Senior Member

    Jan 8, 2022
    853
    143
    Exeter
    A picture of the head, with the new valve guides and a home made drift, alongside. Next step was to put the head in the oven and heat to 330 deg C.
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  14. Sir Clip

    Sir Clip Senior Member

    Jan 8, 2022
    853
    143
    Exeter
    #294 Sir Clip, Sep 4, 2022
    Last edited: Sep 7, 2022
    Picture taken through the oven door, the reflection on the glass window in the door makes for a poor photo. The head is wrapped in tin foil to catch any stray oil drips, and in the top right hand corner is the thermometer. i left it in at 330 deg C for fifteen minutes as that’s how long the engine takes to warm up when running. I found doing it this way doesn’t leave the oven smelling of oil, which keeps the wife happy.

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  15. Sir Clip

    Sir Clip Senior Member

    Jan 8, 2022
    853
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    The old valve guides. These have a slight bronze colour to them, the new ones don’t.
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  16. Sir Clip

    Sir Clip Senior Member

    Jan 8, 2022
    853
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    Exeter
    Head with the new valve guides in.
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  17. Sir Clip

    Sir Clip Senior Member

    Jan 8, 2022
    853
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    Exeter
    Next step grinding the valves in. There is no change in valve angle with the new guides, so a grind with fine paste for the three original valves, and then a leak test. The one valve that was replaced will be ground with coarse then fine paste. None of the seats needed re-cutting.

    I am still wondering why one of the valve stems was excessively worn, while the other three were all right. My guess is that there was not enough oil getting to the right hand exhaust valve.
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  18. darkman

    darkman Crème de la Crème

    Oct 26, 2015
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    Nice job and really lucky with not having to cut the seats :)
     
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  19. Sir Clip

    Sir Clip Senior Member

    Jan 8, 2022
    853
    143
    Exeter
    I spoke too soon! After the valves were lapped in it was obvious that the two inlet valves were not making full contact with the seat. So out with the cutting tool and dressed the seat to be correct with the new guide.
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  20. Sir Clip

    Sir Clip Senior Member

    Jan 8, 2022
    853
    143
    Exeter
    Ready to assemble the head. New valve springs as the old ones were below spec. 18A0BBB3-21DC-4607-9BFA-B5497A348DB0.jpeg
     
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