Re: 1949 Humber town bike restoration
Posted: Mon Mar 27, 2023 9:01 am
While work continues apace on the 1938 Royal Enfield, need to sort the gear 'security' on the Humber. The issue has been the gear of 1st and sometimes 2nd jumping out and clicking to 3rd or forth.
Got the Humber to first which is a very hard spring resisit, you feel the cable could break, and used a tie wrap to hold the trigger in the position to assist the location of the gear shift pawl to the shifter position. Rode the bike around a few times in the cul de sac and the gears would not jump out.
So, this proves the gear jump is due to a worn 1st gear location.
The pawl and body of the shifter is quite fine, less than 1 mm and with wear, corrosion etc that must now be marginal. Once it jumps out of fist position (due to road vibration and outer cable movement the spring is so pent-up to rockets past 2nd most times and stops at 4th or third.
The shifter is working like a sequential shifter.
Another stip down then to see if the parts are soft enough to file a deeper 1st location for the pawl or another shifter off ebay which could be worse than the one I have! They are expensive too, £25 cheapest.
Got the Humber to first which is a very hard spring resisit, you feel the cable could break, and used a tie wrap to hold the trigger in the position to assist the location of the gear shift pawl to the shifter position. Rode the bike around a few times in the cul de sac and the gears would not jump out.
So, this proves the gear jump is due to a worn 1st gear location.
The pawl and body of the shifter is quite fine, less than 1 mm and with wear, corrosion etc that must now be marginal. Once it jumps out of fist position (due to road vibration and outer cable movement the spring is so pent-up to rockets past 2nd most times and stops at 4th or third.
The shifter is working like a sequential shifter.
Another stip down then to see if the parts are soft enough to file a deeper 1st location for the pawl or another shifter off ebay which could be worse than the one I have! They are expensive too, £25 cheapest.