Collets and .... collets
Posted: Sat Mar 21, 2020 11:06 am
I have finally got round to starting to rebuild a 1961G80, bought as a project about 15 years ago. I stripped the bike and stored items 'safely', but the ravages of time and other distractions - including other bikes - are taxing my memory … 'now where did I put ….' or 'did that go that way round?' The latest stumbling block found me trying to rebuild the head - I know, hairspring valves can be a swine to fit, but this took the biscuit ….. having ground in the valves, I started to fit the inlet. I have one of the semi circular spring compressors which was duly fitted and I dropped in the first collet, followed by the second …. bit of a fiddle, but when I released the pressure on the springs the collets would not fall into place. Several hours - yes, HOURS! - found me still struggling with the first valve, until my son returned from work. He came to see how I was getting on, and his keener eyesight spotted a slight problem - the two collets were different profiles, and would not fit together. On checking I found there were 2 different pairs, one for the inlet and one for the exhaust, as the valve stems were different sizes …. Is that normal? Having matched the collets to the collars - also different! - twenty minutes later found everything sorted, well for the moment anyway, but watch this space! Tony.