Paul, why I think the bush is false economy, and it's just my opinion, is because even when not racing they have not been all that reliable for me, and my brother's bike with a bush, did a rod bearing last year. I've never had a rod bearing problem with a roller conversion and end feed, and the difference in cost isn't all that much when you consider the bottom end will likely be good for 100,000Miles+, and next time you replace it it's simple. Plain bearings may be good but I don't think that one's good in that, esp with the way oil is meant to go into the crank, also it looks small in dia. Maybe my perspective is different but the last rear tyre I put on a bike was $300.
Re: Recommended machinist for BSA T/S bush#40280 07/03/081:51 am07/03/081:51 am
GP, I have a guy here in NC that has a lab grade vertical jig boring machine. He has done a couple for A65 plain bearings for me and the results on both motors were excellent. It is kind of a long way to ship a bottom end though. I am not a fan of reaming. It will size the hole ok, but will not ensure the bore is perfectly true.
Re: Recommended machinist for BSA T/S bush#40281 07/03/083:12 am07/03/083:12 am
E Webster, When I asked that question of my machinist he used that word "lab grade". He said it was a small machine that had been designed and built for the fabrication of small parts for lab testing equipment. He claims very high accuracy within .0001-2 on an aligh bore. The bush had a near mirror finish when it was done and assembled beautifully with .0015 clearance.
That was my experience with this shop that does all kinds of race work on everything from drag racers to outboards to pulling tractors. He showed me the setup procedure he would use for the A65. I ran the setup by my brother who is a tool maker by trade and I was convinced that I would get a good job. I wasn't disappointed. the guy does no advertising and and his shop is backed up. Took me several weeks to get a head done.
Re: Recommended machinist for BSA T/S bush#40283 07/03/081:38 pm07/03/081:38 pm
Raf, Edge Brothers Machine Shop, Wayne abd Earl. Wayne does the head work and Earl does the boring, crankwork and block work. The are located in jacksonville, NC. (919) 219-7817. Earl has done my bushings on A65 and Wayne did a head for me on a B50. Wayne resleeves worn guides rather than replaceing them. All work came out excellent.