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b175 ignition cam retaining screw
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Doug Brown
Wiltshire
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February 3, 2014 - 6:10 pm
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I`m sure someone asked this fairly recently, had a search but cannot find it. What thread is the ignition cam screw ? I was checking the ignition timing and it seemed way out , points opening at about  seven degrees btdc instead of sixteen ! Checked the points and they were a little narrow, adjusted them but best I could get was ten degrees btdc with the adjustment plate fully rotated one way,uh oh says I, whats going on here ?

       Its a little bit gash as it relies on the screw being tight to secure the cam to the tapered end of the crank and getting the initial setting is a bit hit and miss. Needless to say it wasn`t as tight as perhaps it could have been, exacerbated by a less than pristine screw slot. No problem, I have a new cam I`ll fit that except it wouldn`t screw in and looking at the screw it had the first number of threads knackered. So I need to run a tap down the female thread, box full of taps and not one of them fits 2 b.a. is too big , or rather feels it. Anyone know ?

Triumph Thunderbird 900 Yamaha rxs 100 and too many bantams !

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sunny
Norfolk
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February 3, 2014 - 7:14 pm
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hi  Doug   if its  the    same    as  the  keyed  cam  on   the   wp 55   its  a wood  screw  size      and   has   too  be   ordered

some   thing    like    4 mm     i  think         sunny

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Doug Brown
Wiltshire
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February 4, 2014 - 6:53 pm
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2BA is the answer. No its not the same as the w55 sunny as its mounted on the right side of the engine and it has no key!

         Its a devil of a job , what you have to do is use a dial gauge to get top dead centre. Then use a degree wheel to set the timing at 16.5 degrees before tdc and I paint marked the flywheel to facilitate using a strobe next time.

Triumph Thunderbird 900 Yamaha rxs 100 and too many bantams !

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sunny
Norfolk
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September 19, 2019 - 9:05 am
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2BA , 3 BA & 4BA    are  the  sizes   used  on   bantams   lenths  &  heads    to  soot  the  job

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