TNT899_new starter
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Thread: TNT899_new starter

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    Member Adonis's Avatar
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    Question TNT899_new starter

    I need a new starter. Mine is worn and I don't see the reason, the bike has only 15k km.
    Can anyone please confirm if the 10-teeth sprocket Denso 128080-8630 fits the TNT?
    Clockward rotate direction is correct?
    thanks guys!

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    Senior Member Rick67's Avatar
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    Hi .. just so we know what are your symptoms first ?

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    Senior Member Rick67's Avatar
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    Have a look here in Errol's site good alternative parts listed .
    http://www.engenia.com.au/01_General.../AltParts.html
    Also have a look for this on fleabay.
    But please check first .
    https://rover.ebay.com/rover/0/0/0?m...2F283059843989

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    Member Adonis's Avatar
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    Thanks for answering mate,
    that model (errol's site) is no longer available, it's been replaced by the Denso 128080-8630:
    Click image for larger version. 

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    the problem is that some suppliers offer the same starter with 9-teeth sprocket (TnT's starter is 10-teeth) ... and prices vary a lot.


    symptoms: the cooper sheets and carbon brushes are so worn that the starter does not rotate fast enough to start the engine.
    From inside, the starter seems much older than the bike...
    Click image for larger version. 

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    Last edited by Adonis; 05-11-2019 at 01:12 AM.

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    Senior Member Rick67's Avatar
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    Oh dear that looks bad !! .. is their any companies near you that could Refurb your starter ... Worth a try maybe .
    I see there are new ones for sale from the states. Import duty on top I guess .
    Or you could look for the Triumph alternative.

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    The groove worn into it isn't very deep - maybe around half a millimetre. If the copper segments of the commutator have sufficient thickness, you can use a lathe to turn it down to a clean cylindrical surface again.
    It's a simple job if you or any of your friends have a lathe. Chuck speed about 1500 rpm, take several shallow cuts and finish with fine emery to remove any burrs.

    I'd also suggest you replace the brushes. It looks as though the brushes that were in it were too hard or abrasive. Also check that the brush spring isn't applying too much force. The brushes just need to be held in contact with the commutator. You should be able to easily lift the spring with light finger pressure.
    Last edited by Sprocket; 05-10-2019 at 09:08 PM.

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    Member Adonis's Avatar
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    Quote Originally Posted by Rick67 View Post
    Oh dear that looks bad !! .. is their any companies near you that could Refurb your starter ... Worth a try maybe .
    I see there are new ones for sale from the states. Import duty on top I guess .
    Or you could look for the Triumph alternative.
    I'm still on it... and you guess right!
    Anyway, I prefer a new one, even paying taxes, to a second-hand one, given the state of mine ...

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    Member Adonis's Avatar
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    Quote Originally Posted by Sprocket View Post
    The groove worn into it isn't very deep - maybe around half a millimetre. If the copper segments of the commutator have sufficient thickness, you can use a lathe to turn it down to a clean cylindrical surface again.
    It's a simple job if you or any of your friends have a lathe. Chuck speed about 1500 rpm, take several shallow cuts and finish with fine emery to remove any burrs.

    I'd also suggest you replace the brushes. It looks as though the brushes that were in it were too hard or abrasive. Also check that the brush spring isn't applying too much force. The brushes just need to be held in contact with the commutator. You should be able to easily lift the spring with light finger pressure.
    that would be a solution, thanks, but the copper sheets are very thin and some have already been bent ...
    As for the brushes, there is almost nothing left of them...

    Maybe this is because the brushes were too tight, or maybe this starter is just not my bike's original one....

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    Ok, if there's not enough metal to turn it down to a clean cylindrical surface, you may get another season out of it by just cleaning it up. Put it in a lathe and spin it while polishing the surface of the commutator by hand with fine emery cloth. There's no guarantee that it'll be perfectly concentric, and it will still have the groove, but the new brushes will soon bed into the shape. It'll cost nothing so is worth a try to get the bike back on the road while you're looking for a new starter.
    ron d likes this.

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    Member Adonis's Avatar
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    you're right mate! I could fix it and keep it as a spare starter.

    thanks guys!!

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