myson Posted January 11, 2010 Report Share Posted January 11, 2010 (edited) Hi guys, i am continuing with the restoration of my M-80 and am looking for guidance on removing swinging arm bushes prior to grit blasting and powder coating frame and swinging arm. Any tricks or tips? By the way is Edited January 11, 2010 by myson Quote Link to comment Share on other sites More sharing options...
rcgods Posted January 11, 2010 Report Share Posted January 11, 2010 Its not a bad price for the blast and coating. Just make sure you take everything with you, last time I forgot to take my rear brake pedal so had that done later on. I didn't remove the outer bushes for the powdercoating as I would have probably mangled them when bashing them out with a drift. Quote Link to comment Share on other sites More sharing options...
myson Posted January 11, 2010 Author Report Share Posted January 11, 2010 Cheers, M-80 only has one set of bushes from what I can see, pressed into arm. Do you rekon its ok to leave them in and tape over bore? Thanks Quote Link to comment Share on other sites More sharing options...
bultaco49 Posted January 11, 2010 Report Share Posted January 11, 2010 Hi - As stated, you can leave the outer bushes in if there is no play in the swing arm. If there is drift them out and replace with bronze bush & spindle set - not the plastic ones. Remember to clean out the grit from within the swingarm and headstock before reassembling. I used to have the powder coaters blast the frame but the grit they tend to use is very aggressive and one frame came back minus the frame number! Now I blast them myself as not only do I use a fine abrasive but I get into all the nooks and crannies so I don't end up with powder coated mud at the frame joints. Also make sure to thoroughly degrease as the powder coating process uses heat and any bearing grease (headstock, swingarm) will run out and ruin the finish. Check the RAL code of the silver the contractor intends (he will have a RAL colour chart to compare) to use and tell them not to just hang it with any old silver items going through the oven. The Bultaco silver has a high silver opacity (almost metallic) so look at the RAL colour chart and agree a code before handing frame over. Somewhere I have a code for the silver but sorry, cannot find it at the moment. Quote Link to comment Share on other sites More sharing options...
myson Posted January 11, 2010 Author Report Share Posted January 11, 2010 (edited) Thanks again for help, will pay attention to everything you mentioned. I am replacing the spindle as threads are ropey, is it worth renewing bushes while it is stripped down to save work later? When you say outer bushes I can only see one set which are in the swinging arm, not like later models that have two sets. Cheers Edited January 11, 2010 by myson Quote Link to comment Share on other sites More sharing options...
wayne_weedon Posted January 11, 2010 Report Share Posted January 11, 2010 Thanks again for help, will pay attention to everything you mentioned. I am replacing the spindle as threads are ropey, is it worth renewing bushes while it is stripped down to save work later? When you say outer bushes I can only see one set which are in the swinging arm, not like later models that have two sets.Cheers Could of had the 'orrible silentbloc (Bonded rubber) conversion at one time. Usually complete with 1/2" spindle instead of the standard 12mm. Original was Bronze outer bushes, with steel inner bushes/sleeves, and a spacer between them. Wayne.... Quote Link to comment Share on other sites More sharing options...
myson Posted January 11, 2010 Author Report Share Posted January 11, 2010 Had a look in a copy of a manual(for Alpina so similar to Sherpa) I have and there were two types of swinging arm fitted one had a one piece tube across (Mod 49 type?)between frame and the other was two short tubes. Mine has the one piece and it looks like the 12mm spindle just runs through the bush without any outer bushes. Has not been modded in any way as I can see the bushes in the arm, Cheers Quote Link to comment Share on other sites More sharing options...
wayne_weedon Posted January 11, 2010 Report Share Posted January 11, 2010 (edited) Had a look in a copy of a manual(for Alpina so similar to Sherpa) I have and there were two types of swinging arm fitted one had a one piece tube across (Mod 49 type?)between frame and the other was two short tubes. Mine has the one piece and it looks like the 12mm spindle just runs through the bush without any outer bushes. Has not been modded in any way as I can see the bushes in the arm,Cheers Up to model 151 had the earlier style swinging arm. After that the rear engine mount became part of the swinging arm assembly, hence the two tubes. What do your visible bushes look like? have a flange same diameter as the swinging arm tube? and made of Phos/bronze? Wayne..... Edited January 11, 2010 by wayne_weedon Quote Link to comment Share on other sites More sharing options...
myson Posted January 12, 2010 Author Report Share Posted January 12, 2010 Sorry about delay in reply Wayne, work interferes with important suff sometimes. The bushes are as you describe and bronze, cheers Quote Link to comment Share on other sites More sharing options...
wayne_weedon Posted January 12, 2010 Report Share Posted January 12, 2010 Should have inner bushes then, Picture below is linked from Bultaco UK's website. Your machine should have the parts shown top left. 2 of each. I was more concerned that if you had the silentbloc conversion that the rubber might have done weird stuff in the powder coating cure ovens. Wayne.... Quote Link to comment Share on other sites More sharing options...
myson Posted January 12, 2010 Author Report Share Posted January 12, 2010 Thats good news Wayne. I will replace bushes anyway with correct ones from Bultaco uk. Do you think a new spindle made from 12mm stainless bar would be ok? Cheers Quote Link to comment Share on other sites More sharing options...
wayne_weedon Posted January 12, 2010 Report Share Posted January 12, 2010 Thats good news Wayne. I will replace bushes anyway with correct ones from Bultaco uk. Do you think a new spindle made from 12mm stainless bar would be ok?Cheers I should not answer that! haha...... Quote Link to comment Share on other sites More sharing options...
myson Posted January 12, 2010 Author Report Share Posted January 12, 2010 I will take that as a yes Wayne! but for the sake of a tenner I will probably buy new from Bultaco UK as you spend so much time helping people like me on the forum, many thanks, Quote Link to comment Share on other sites More sharing options...
wayne_weedon Posted January 12, 2010 Report Share Posted January 12, 2010 I will take that as a yes Wayne! but for the sake of a tenner I will probably buy new from Bultaco UK as you spend so much time helping people like me on the forum, many thanks, Actually it was not a "yes". Quote Link to comment Share on other sites More sharing options...
myson Posted January 12, 2010 Author Report Share Posted January 12, 2010 Never mind I was going to buy new anyway, your help is invaluable to us novices and much appreciated, Thanks 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.