bondy Posted April 7, 2018 Report Share Posted April 7, 2018 hello as any 1 had problems with the rear sprocket bolts? i just got a new s3 sprocket and the bolts stick out to much there is a shallow recess not counter sunk any ideas what bolts i can use? i do have domed bolts but not sure if they will catch the S/Arm Quote Link to comment Share on other sites More sharing options...
pmk Posted April 7, 2018 Report Share Posted April 7, 2018 Just dealt with this. No countersunk sprockets in 40t. Only counterbored. Considered swapping from flush head / countersunk style to the counterbored shallow dome stle heads. The Scorpa swingarm to bolthead clearance was pretty tight, and the countebored sprocket and that style bolt was marginal if any clearance. Ultimately, I countersunk the counterbored sprocket and used the original flush head bolts. Catch a look at the recent topic where I installed the Jitsie snails and 40t rear sprocket. Quote Link to comment Share on other sites More sharing options...
bondy Posted April 7, 2018 Author Report Share Posted April 7, 2018 i was thinking about using a counter sunk drill bit and doing the same as you using the original counter sunk bolts but i don't want to weaken the holes i have found some domed bolts that are shallow and high tensil i know there's not much space between the sprocket and S/Arm i will test the bolts before making a decision. Quote Link to comment Share on other sites More sharing options...
pmk Posted April 8, 2018 Report Share Posted April 8, 2018 To properly countersink the holes, you must use a countersink in the drill press or milling machine. The countersink angle must match or the sprocket will work as you accellerate or decellerate, ultimatley ruining the hub. Quote Link to comment Share on other sites More sharing options...
pmk Posted April 8, 2018 Report Share Posted April 8, 2018 Quote Link to comment Share on other sites More sharing options...
bondy Posted April 8, 2018 Author Report Share Posted April 8, 2018 looks like ill have to do this as there's not enough clearance between the sprocket and S/Arm Quote Link to comment Share on other sites More sharing options...
pmk Posted April 9, 2018 Report Share Posted April 9, 2018 The countersink cutters angle must match the bolt heads angle, otherwise there will be only a small ring of surface contact between the bolts head and countersunk hole in the sprocket. You mentioned using a drill to accomplish countersinking the sprocket. Most drill bits are an angle of 118 degres and some being 135 degrees, but other odd angles may exist. Countersinks come in various angles also, typically 60, 82, 90, 100, 120 degree cutting angles. Pretty certain the proper cutter angle was 90 degrees, but did not run to the toolbox and check. Quote Link to comment Share on other sites More sharing options...
bondy Posted April 10, 2018 Author Report Share Posted April 10, 2018 Hello PMK I've sorted the New S3 rear sprocket i did what you have done countersunk the holes fits perfect now the New gold and black chain is also on and looks very tidy Quote Link to comment Share on other sites More sharing options...
pmk Posted April 10, 2018 Report Share Posted April 10, 2018 When are you planning to share photos of this masterpiece????????? Quote Link to comment Share on other sites More sharing options...
bondy Posted April 10, 2018 Author Report Share Posted April 10, 2018 When it's finished I will up load photos not be long now Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.