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Thread: Bit of airhead gearbox help please

  1. #1
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    Bit of airhead gearbox help please

    Hi All, I`m trying to fix an R65 - the gearchange pedal does not return to `normal` position after an attempted gearchange from forth to third meaning that I can`t get it into second. If I reach down and `fiddle` with the gear lever it can be done but it`s near impossible with my foot.

    Any ideas on what it could be guys?

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    Quote Originally Posted by Mark Hooton View Post
    Hi All, I`m trying to fix an R65 - the gearchange pedal does not return to `normal` position after an attempted gearchange from forth to third meaning that I can`t get it into second. If I reach down and `fiddle` with the gear lever it can be done but it`s near impossible with my foot.

    Any ideas on what it could be guys?
    first things first...

    Is the kinetic linkage and gear shift pivot assembled correctly and moving freely through its travel?



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  3. #3
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    I think so but I’ll check in the morning. It has been working fine for a while then it started playing up - there’s been no disassembly in between.


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    Quote Originally Posted by Mark Hooton View Post
    I think so but I’ll check in the morning. It has been working fine for a while then it started playing up - there’s been no disassembly in between.


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    Maybe a degrease and re-grease is needed.
    Fingers crossed for the easy fix.


    What year is it?


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  5. #5
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    Not sure, I’ll check tmoz thanks for the support guys. I’ll check the linkage tmoz - hopefully it’s just slipped but any other ideas greatly appreciated


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  6. #6
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    1985


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    Quote Originally Posted by Mark Hooton View Post
    1985


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    Righto - if the cam plate return spring had failed you’d be getting the same symptom in every gear.

    plenty of other things it could be but all involve pulling the box and opening it up.



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  8. #8
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    Ok! Thanks


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  9. #9
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    Sounds like the usual problem, broken return spring.

    Try turning the bike upside down and see if the gear change is ok ... No really, it does work, it's a way of getting the bike into a driveable gear in case it's stuck in 5th or 1st gear miles away from home
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  10. #10
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    Well that’s a great tip, I’d never had thought that would work in a million years.

    Never got chance to check the linkage - just too busy - but will look tmoz.

    Another issue - it suffers from all the symptoms of fuel starvation I.e. high constant speed and engine dies. Leave it for a mo and all is well!

    Normally I’d say this is a blocked breather but the breather seems ok - mebbe sh1te in the tank???


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    Quote Originally Posted by Mark Hooton View Post

    Another issue - it suffers from all the symptoms of fuel starvation I.e. high constant speed and engine dies. Leave it for a mo and all is well!

    Normally I’d say this is a blocked breather but the breather seems ok - mebbe sh1te in the tank???


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    If the breather is ok, could it be a pinch or blockage in a fuel line, so the float bowls empty faster than the fuel supply can re- fill them?
    The Other PaulG



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  12. #12
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    Well, linkage seems ok so it`s gearbox out - I have a Haynes but does anyone have any top tips on gearbox removal?

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    Quote Originally Posted by Mark Hooton View Post
    Well that’s a great tip, I’d never had thought that would work in a million years.

    Never got chance to check the linkage - just too busy - but will look tmoz.

    Another issue - it suffers from all the symptoms of fuel starvation I.e. high constant speed and engine dies. Leave it for a mo and all is well!

    Normally I’d say this is a blocked breather but the breather seems ok - mebbe sh1te in the tank???


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    Could be the fuel float levels are set wrongly in the float bowls.
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  14. #14
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    Quote Originally Posted by Steptoe View Post
    Could be the fuel float levels are set wrongly in the float bowls.
    Thanks I’ve tried that - it’s turned out to be a blocked filter from a filthy tank!

    Am hoping to get the gearbox out this afternoon - I’m thinking a spring has gone......


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  15. #15
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    Well what a saga! I’m at the bit where Haynes sez ‘disconnect drive shaft (so you can remove the swinging arm and move it to the rear) but where and how do I disconnect guys? Any ideas?


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    Quote Originally Posted by Mark Hooton View Post
    Well what a saga! I’m at the bit where Haynes sez ‘disconnect drive shaft (so you can remove the swinging arm and move it to the rear) but where and how do I disconnect guys? Any ideas?

    F
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    Simple, you use a 10mm 12 point ring spanner on the nuts, your finger is pointing to.

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