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Thread: Yamaha Yzf600r Thundercat gearbox fix thread

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  1. Yamaha Yzf600r Thundercat gearbox fix thread 
    #1
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    I have started the mammoth task of getting my bike in pieces so I can first take a look at the gearbox then secondly, hopefully, fix it.

    Few start off pictures shall we?




    So got all fairings off that I need to. Ive got the sprocket cover off. Disconnected the battery and drained the oil.

    Next session will be drain coolant, remove radiator, water pump, piping etc. Then remove the exhaust. Remove petrol tank and start to strip the Carbs down on the engine.
     
     

  2. Re: Yamaha Yzf600r Thundercat gearbox fix thread 
    #2
    Diamond Member Dan505's Avatar
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    safer/easier to take tank off now before you start messing with the rest?

    good luck with it tho
    onwards and upwards and sometimes a little sidewards....

     
     

  3. Re: Yamaha Yzf600r Thundercat gearbox fix thread 
    #3
    Diamond Member Scotty's Avatar
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    DON'T remove the water pump before dropping the engine out! That'll leave a big hole into your gearbox that any crap can get into, even if you're splitting the engine you still don't want anything untoward inside it.
    Someone may have mentioned already somewhere, give your exhaust header clamp nuts a good spray with WD40 or similar and let them soak for a while, they may not have been disturbed since the bike was new and a snapped exhaust stud is a pain in the arse >
    If there's a garage close by it might be worth asking if you could push it round there for them to use a rattle gun to loosen the clutch centre nut and your front sprocket nut too, you could struggle with them otherwise (ask first and if they will, take off the clutch cover and remove the pressure plate and all the friction plates, then refit the cover to push it round. Either that or borrow a compressor and rattle gun from someone)
    Racing is life, anything before or after is just waiting.
    Steve McQueen
     
     

  4. Re: Yamaha Yzf600r Thundercat gearbox fix thread 
    #4
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    Will brute force work too? I am nowhere near pushing distance of a bike garage or any mechanics garage. I'll keep mister water pump on then but take his arms(pipes) off.

    Anyone any idea how much the engine will weight roughly in KG? Bikes whole weight is 187kg.
     
     

  5. Re: Yamaha Yzf600r Thundercat gearbox fix thread 
    #5
    Diamond Member Scotty's Avatar
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    If you can get sufficient leverage then pure torque will do it, but you may need a breaker bar a metre long and maybe a lump hammer to assist by giving the back of the socket a tap when it's loaded up. Use a length of wood through the rear wheel to lock it against the swingarm.
    The engine will probably be getting on for half the mass of the bike. Unless you're unfeasibly strong and dexterous it's a 2-person job to remove, refitting is easier with three.

    RTFM will really help, do that first....
    Racing is life, anything before or after is just waiting.
    Steve McQueen
     
     

  6. Re: Yamaha Yzf600r Thundercat gearbox fix thread 
    #6
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    You have a garage...yes? You're not doing this outside your house shirley?
     
     

  7. Re: Yamaha Yzf600r Thundercat gearbox fix thread 
    #7
    Chatterbox Jon_W's Avatar
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    Get the exhaust off. Soak it in WD40 for days, then tackle. Is going to be the worst bit.

    Agreed with Scotty, wedge the read wheel and with a breaker bar and hammer, shock the sprocket nut off. If you can VERY carefully apply heat to the nut, it will break any thread lock in there.

    As to the engine, I imagine that it is going to be the better part of 100kg. You'll need two or three people to get it out the bike safely.
    "there's no aspect, no facet, no moment in life that can't be improved with pizza"

     
     

  8. Re: Yamaha Yzf600r Thundercat gearbox fix thread 
    #8
    Diamond Member Dan505's Avatar
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    Quote Originally Posted by Scotty

    RTFM will really help, do that first....
    Excuse the interruption guys but whats RTFM? Only ask cause might have to have mine in bits
    onwards and upwards and sometimes a little sidewards....

     
     

  9. Re: Yamaha Yzf600r Thundercat gearbox fix thread 
    #9
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    Really Tight Flux Manipulator.
     
     

  10. Re: Yamaha Yzf600r Thundercat gearbox fix thread 
    #10
    Diamond Member Dan505's Avatar
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    Aint that stupid Mitch.....an it aint a deloren either
    onwards and upwards and sometimes a little sidewards....

     
     

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