coombehouse Posted March 16, 2016 Share Posted March 16, 2016 On my GSX1100EZ fork change, I would like to keep the standard clocks so i will have to machine the GSXR K3 wheels to fit a drive. Can anyone suggest the narrowest speedo drive as a start. A ZXR750 has a 25mm bore which is correct & would probably work out ok for the accuracy but its too wide. T595 might be an option but its hard to figure out the size just looking on that site. Help please Nick Quote Link to comment
Gammaboy Posted March 16, 2016 Share Posted March 16, 2016 Cagiva Mito is also a 25mm bore, will measure width tonight for you. Quote Link to comment
Nigkat Posted March 16, 2016 Share Posted March 16, 2016 This is what I did on my Kat with Zrx1200 forks and Cbr 600 wheel (no speedo drive) Speedo drive from I think a zrx , removed the drive dog plate and machined the housing down on both faces to suit my gap. machined a new drive dog to fit. needed to fit an oil seal to. machined the wheel to accept the drive. All fitted and working just fine. 1 Quote Link to comment
coombehouse Posted March 16, 2016 Author Share Posted March 16, 2016 That is very neat but I dont think I have that much space but at least I know it can be done. Thanks for the pics too. Nick Quote Link to comment
Gammaboy Posted March 17, 2016 Share Posted March 17, 2016 (edited) Sorry, forgot to measure the Mito one last night, will sort it tonight. Went looking for photos - the Aprilia RS125 one looks good and narrow (2001 RS125 apparently): Edited March 17, 2016 by Gammaboy Quote Link to comment
melkweg Posted March 17, 2016 Share Posted March 17, 2016 You will need the same ratio to keep the reading correct though? Quote Link to comment
coombehouse Posted March 17, 2016 Author Share Posted March 17, 2016 19 hours ago, melkweg said: You will need the same ratio to keep the reading correct though? I am hoping that using a part from something that has a 17 inch front wheel will be close enough. I am lead to believe that most Japanese mechanical speedos use the same ratio at the speedo head & the ratio is modified at the wheel. Fingers crossed. Quote Link to comment
melkweg Posted March 17, 2016 Share Posted March 17, 2016 Just to confuse things further http://newmotorcycleparts.net/controls/gauges.html Quote Link to comment
coombehouse Posted March 17, 2016 Author Share Posted March 17, 2016 3 minutes ago, melkweg said: Just to confuse things further http://newmotorcycleparts.net/controls/gauges.html Ah yes but there are only 2 ratios for speedos & as its a US site hopefully one of the is for those Hardly Fergusons. According to another forum all J speedos are 2240:60. Someone who knows will hopefully confirm this. Quote Link to comment
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