ikb Posted December 11, 2020 Report Share Posted December 11, 2020 Hi, I have just acquired a 1968 Bearcat which is the ideal starting point to build a Gaunt replica! Being the latest model of the Bearcat it has the B100 frame with the TC120 dual range motor it’s perfect for the job! But I have a number of questions... Forks, These should be from the Invader 200 are they still 30mm? And looking at photos they must be a bit longer if so how much? If I can’t find any Invader forks I’ll find something suitable that looks right While we are at the front did Peter alter the head angle? Hubs These look to be smaller than the B100 or Bearcat hubs, possibly A100 or A50? Swinging Arm I know it’s about an inch longer but does anyone know how much exactly? And what length shocks would be best? Engine, So far I’ll just be fitting the T20/ GT 250 piston as it needs a bit of a rebuild anyway Any information is welcome Thanks Ian Quote Link to comment Share on other sites More sharing options...
teamferret Posted December 12, 2020 Report Share Posted December 12, 2020 use the hubs from the K10/11 80cc Suzuki. I only have experience of using super six pistons, I think the GT250 ones are slightly shorter and may mess with the porting Quote Link to comment Share on other sites More sharing options...
cleanorbust Posted December 12, 2020 Report Share Posted December 12, 2020 Peter Gaunt used the Super Six piston, making capacity 128cc from 118cc. There's a detailed article about the bike, including a picture of the lengthened swinging arm, on www.bsaotter.com in the article headed "Geekies Gizzmo" in the list on the right of the screen. 1 Quote Link to comment Share on other sites More sharing options...
ikb Posted December 12, 2020 Author Report Share Posted December 12, 2020 Thanks I think the super six is the T20 and according to various websites the part number for the pistons are the same for the early GTs , but I will check again. Ian Quote Link to comment Share on other sites More sharing options...
ikb Posted December 16, 2020 Author Report Share Posted December 16, 2020 Just a piston update, I’ve gone for a Mitani 53.5mm B100 piston which is only 0.5mm less than the super 6 piston giving 125.8cc. I don’t think I’ll miss the missing 3 cc! Ian Quote Link to comment Share on other sites More sharing options...
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