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Starter - 9 or 10 teeth pinion

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Mick5961

Post subject: Starter - 9 or 10 teeth pinion

Posted: Fri Jan 25, 2019 10:40 pm

848cc

Joined: Sun Dec 17, 2017 7:56 am
Posts: 3

Hi all,
Just replaced my Lucas 9 tooth starter for a new 10 tooth. Some suggest its a non issue, others say the 10 tooth will eat the ring gear. Engine is a 1969 - 1100S block with a Mk3 Cooper head. Not sure on the ring gear teeth number though - 129/107?
Cheers

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drmini in aust

Post subject: Re: Starter - 9 or 10 teeth pinion

Posted: Sat Jan 26, 2019 9:00 am

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39754
Location: near Baulkham Hills, NSW

Both pinions work fine. But original was 9 tooth.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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Mick5961

Post subject: Re: Starter - 9 or 10 teeth pinion

Posted: Sat Jan 26, 2019 9:46 am

848cc

Joined: Sun Dec 17, 2017 7:56 am
Posts: 3

Many thanks Doc, was worried there for a bit :oops:

I wonder why some say the 10 tooth will eat the ring? :?:

Cheers
Mick

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drmini in aust

Post subject: Re: Starter - 9 or 10 teeth pinion

Posted: Sat Jan 26, 2019 10:15 am

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39754
Location: near Baulkham Hills, NSW

I have used a 10 tooth one for years.

Re the 127T ring gear that is for the Rover pre-engaged starter which has finer teeth.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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Mick5961

Post subject: Re: Starter - 9 or 10 teeth pinion

Posted: Sat Jan 26, 2019 10:53 am

848cc

Joined: Sun Dec 17, 2017 7:56 am
Posts: 3

Interesting, thanks for the feedback.
Cheers

Mick

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