charlie prescott Posted July 4, 2011 Report Share Posted July 4, 2011 Hi Guy's. I see that Woody has his C15 for sale on e-Bay. This bike has the power in a C15 that everyone is looking for, I am currently trying to build an engine that is simular. It is a shame, I have now got most of the parts together! Or I would be bidding on Woody's bike. So if you are intrested in a bike that wins trials! I would take a look at this before it is to late? You only have four days. :thumbup: Regards Charlie. Quote Link to comment Share on other sites More sharing options...
bobtlr Posted July 6, 2011 Report Share Posted July 6, 2011 Hi Guy's. I see that Woody has his C15 for sale on e-Bay. This bike has the power in a C15 that everyone is looking for, I am currently trying to build an engine that is simular. It is a shame, I have now got most of the parts together! Or I would be bidding on Woody's bike. So if you are intrested in a bike that wins trials! I would take a look at this before it is to late? You only have four days. :thumbup: Regards Charlie. hey Charlie, the bike sure looks good but what is special on the engine? are there things to change on a C15 (mine is a b40) to turn them into a better trials engine ? best regards bob Quote Link to comment Share on other sites More sharing options...
charlie prescott Posted July 6, 2011 Author Report Share Posted July 6, 2011 Hi Guy's Hi Bob, With a unit BSA it is all about balance. Back in the sixties the boys in the Comp shop did there damdest, to try and find a reason why the B40 would not find the same grip has a good C15. Every thing was tried mostley to no avail, The boys sticking with the C15 motor found more grip. Most of them used higher comprestion pistons than was standard, and this made the motor even softer with its power delivery. There was no reason to it but it worked. I have always felt that a bit bigger piston might just help to increase this grip found with a C15 and 280-285 cc seems to be the Magic number.(Dave's bike is in this range) I have watched bikes perform with this capacity, over the past couple of years both solo and sidecar, and I cannot believe the grip and power that they are finding, I have been told this week that Jeff Smith agrees with me. So I can say no more, but watching Dave compete, on the bike for sale, I can tell you that this is a "Magic" engine, and one I would love to own. :thumbup: Ps,there may be spelling mistakes in this, but I have ditched the Google add on, as it was slowing up the computor to a standstill. Regards Charlie. Quote Link to comment Share on other sites More sharing options...
woody Posted July 6, 2011 Report Share Posted July 6, 2011 Well, the BSA has now gone to a new home and I feel quite sad about it really as I've had some decent rides on it over the years. One or two nightmare in the early years as well mind. However, I have another to get ready which will take a few months and I need to finance it. Bob - the engine was a pretty standard distributor type, standard road cam, head, no big valves or porting. Triumph 650 (I think) piston, low compression, which put it somewhere around 280cc max I think. Amal 22mm carb and PVL ignition. Swingarm was converted to needle rollers, shocks were angled and worked very well, IRC rear tyre and it found grip very well in mud. The motor was quite soft. I generally rode it with no tickover, no clutch and it had plenty of feel at the back wheel, probably the suspension set up and definitely the IRC helped with that. Many years ago, I borrowed a B40 from Norman Blakemore (NJB Shocks) and the engine on that bike was very good. It was a WD motor with a low compression piston and would have had electronic ignition of some sort (this was about mid 1990s) Amal carb. It was very smooth, revved freely and it actually found grip in mud quite well. Quote Link to comment Share on other sites More sharing options...
bobtlr Posted July 7, 2011 Report Share Posted July 7, 2011 my bsa has a B40 road engine with wd gearbox cluster and a low compression piston (7/1) it runs on a digital electronic ignition set to be quite soft but it revs well the bike grips really good i find the bike a bit to soft sometimes, i'm thinking to try a B50 cylinder and piston on a B40 crankshaft (around 390cc) and maybe alter the compression a bit to 8.5/1 i run a 24 mm mikuni carb best regards bob Quote Link to comment Share on other sites More sharing options...
pitley Posted July 11, 2011 Report Share Posted July 11, 2011 Well, the BSA has now gone to a new home and I feel quite sad about it really as I've had some decent rides on it over the years. One or two nightmare in the early years as well mind. However, I have another to get ready which will take a few months and I need to finance it. Bob - the engine was a pretty standard distributor type, standard road cam, head, no big valves or porting. Triumph 650 (I think) piston, low compression, which put it somewhere around 280cc max I think. Amal 22mm carb and PVL ignition. Swingarm was converted to needle rollers, shocks were angled and worked very well, IRC rear tyre and it found grip very well in mud. The motor was quite soft. I generally rode it with no tickover, no clutch and it had plenty of feel at the back wheel, probably the suspension set up and definitely the IRC helped with that. Many years ago, I borrowed a B40 from Norman Blakemore (NJB Shocks) and the engine on that bike was very good. It was a WD motor with a low compression piston and would have had electronic ignition of some sort (this was about mid 1990s) Amal carb. It was very smooth, revved freely and it actually found grip in mud quite well. Hows the new bsa coming along then? Will it be ready for our trial in september? Quote Link to comment Share on other sites More sharing options...
woody Posted July 11, 2011 Report Share Posted July 11, 2011 Hi Andy Slowly is the answer to that one. I have too much getting in the way which is why a few bikes have been sold and some are in the process. The Jumbo is next. Then I can concentrate on the BSA. Although the Bultaco is getting in the way at the moment. What started out as replacing swingarm bushes yesterday has escalated. They were seized solid, so engine had to come out to get at the swing arm properly to cut through the spindle. As the bike was 70% apart, I finished the job as the frame needed painting... etc etc. BSA has oil tank and airbox made, wheels and forks are done, so now it is just a case of fitting it all together for a dry build and then just giving it a test run, but there are loads of little jobs like making cables, oil pipes etc. Originally I wanted it for the Isle of Man but as I didn't get in this year there is no rush now. But at least with other bikes being moved on I can concentrate on it 100% when the Bulto is back together (won't take long as need it for next Miller round) BSA won't be done for your trial, I'll be on the Bultaco for that one and looking forward to it immensely. One of the best trials last year. 1 Quote Link to comment Share on other sites More sharing options...
charlie prescott Posted July 11, 2011 Author Report Share Posted July 11, 2011 Hi Guy's. Hi Woody, Are you still using the Mk3 Otter frame? just wondered as you say oil tank? Would love the information for the build for my website, www.bsaotter.com. perhaps you can mail me? Regards Charlie. Quote Link to comment Share on other sites More sharing options...
woody Posted July 12, 2011 Report Share Posted July 12, 2011 Yes Charlie, MK3 Faber but I don't really trust oil in frame and would rather have an oil tank for peace of mind. I'm not too good at capturing rebuilds on camera but if I remember I'll send you any photos. Definitely get one when it is finished. Wonder what sort of cameras we'll be using by then... Quote Link to comment Share on other sites More sharing options...
charlie prescott Posted July 12, 2011 Author Report Share Posted July 12, 2011 Hi Guy's. Hi Dave, Yea thanks for that, that would be good. Would love to know what you are using in the motor? You could PM me if it is "Top Secret" The middle bit in the engine I am building at the moment has a Honda part that drives a machine that usaly dosen't move very far!! Regards Charlie. Quote Link to comment Share on other sites More sharing options...
old trials fanatic Posted July 12, 2011 Report Share Posted July 12, 2011 Hi Guy's. Hi Dave, Yea thanks for that, that would be good. Would love to know what you are using in the motor? You could PM me if it is "Top Secret" The middle bit in the engine I am building at the moment has a Honda part that drives a machine that usaly dosen't move very far!! Regards Charlie. Thats a pre 65 Honda part of course Charlie just in case the Pre65 police are watching Quote Link to comment Share on other sites More sharing options...
woody Posted July 12, 2011 Report Share Posted July 12, 2011 Hi Charlie, the engine is BSA all through apart from an alloy barrel and the piston maybe, not sure what that is, but I think the reason is more about the height of it than it being anything exotic. Normal C15 head, valves, cam etc with the usual PVL ignition. It's just that most of it is NOS so it should be nice and reliable. Gagging to get it up and running but I've another couple of bikes to get out of the way first, then I'm down to a sensible number that I can manage and get on with the BSA. Quote Link to comment Share on other sites More sharing options...
charlie prescott Posted July 12, 2011 Author Report Share Posted July 12, 2011 Hi Guy's Hi Dave ,Hi OTF. Yea, I have managed to find a a lot of NOS bits or nearly NOS but I think that this is as far as we go with NOS BSA parts because they seem to be running out,Like you Dave I am just longing to get the current build running, to see if my theories are right, or at least workable. OTF ,I think that the Honda part may just have scraped into the sixties as it was a copy of a early Jap bike engine,but downgraded, Regards Charlie. Andy seem to be having conflicts with typing this copy tonight? not running as smoothly as normal?? Quote Link to comment Share on other sites More sharing options...
old trials fanatic Posted July 13, 2011 Report Share Posted July 13, 2011 Hi Guy's Hi Dave ,Hi OTF. Yea, I have managed to find a a lot of NOS bits or nearly NOS but I think that this is as far as we go with NOS BSA parts because they seem to be running out,Like you Dave I am just longing to get the current build running, to see if my theories are right, or at least workable. OTF ,I think that the Honda part may just have scraped into the sixties as it was a copy of a early Jap bike engine,but downgraded, Regards Charlie. Andy seem to be having conflicts with typing this copy tonight? not running as smoothly as normal?? LOL Charlie i'm sure you penned this sometime in the past, if you didnt you should have, and i love it "pre65 ? well the ore it was made from is so it must be" Dont worry about the supply of NOS parts i bet a secret hoarde will be found at some point. Quote Link to comment Share on other sites More sharing options...
charlie prescott Posted July 13, 2011 Author Report Share Posted July 13, 2011 Hi Guy's. Hi OTF, Are you saying that someone, is having a load of new BSA unit bits made then? surley not/ I did not know about this? or should I have? my mind does seem to wander now-adays though. I thought a guy named Wassel was the only boy that was having new replica BSA parts made. ? Regards Charlie. Quote Link to comment Share on other sites More sharing options...
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