So I got frame on the workbench , tank , seat , side covers , engine is bolted in. 2 header pipes , 3 mufflers and determined to not use stock muffler. Only combination that fits real good is oem stuff. So put all that away and start from scratch. BSA parts surfin as usual and found a NOS BSA C15 down swept chrome header. Even has tape on it from the sixties with Bob Chaves BSA/YAMAHA dealer from San JOSE , CA and phone number doesn’t have an area code. C15 is an earlier 250 , so it’s a gamble if it fits but it is the correct diameter. So much prefer a down swept pipe , all but my trials bike have down swept pipes. I’ll have to be very creative on this part , exhaust is huge part of the styling. Has to be clean , has to be era   correct or be so different you won’t be able to tell if its era correct. This will be a task but will also make it pop when done if it looks like the vision in my head. Intake will be easy , longer carb studs for finned carb spacer with a new WASSELL carb with aluminum velocity stack with a Uni foam air filter. Spacer & carb fit perfect while stack & filter will be shrouded behind side covers , no problems there lots of room , looks fantastic. I’ll be happy if exhaust looks as good as the intake. Using a 30 mm carb , up from a 28 mm. Head has been ported  so a better flowing exhaust & bigger carb should help the little thumper  get down the road with a bit more confidence. Fabrication & welding not my high points but I have no fear moving forward that this bike will be freakin Kool !

Intake is mostly done. Replaced stock studs with 2 1/2” studs trimmed to 2 5/16 , 1” thick aluminum finned carb spacer , new 30mm Wassel/Amal , 3” polished aluminum velocity stack & a 3 x 4 Uni foam filter. The set up is a bit long but it touches nothing and has good clearance. With the filter removed and at wot you can look thru it all and see the intake valve. One long straight shot right into the cylinder. The finned spacer is for a 26mm carb , so I got to hog the hole out just a bit to 30mm , then the intake side is  done. Back at the exhaust , have an idea for the baffle. It’s not gonna fab itself up for me !

Header pipe I bought is badas$ but will require some modification. My instinct was right to abandon stock setup completely. The down swept header pipe is so sexy over stock oem  , doesn’t block side view of engine. The half pint thumper has a wonderful shape to it and getting that oem header out of that picture does it wonders. While it doesn’t quite fit , it is the perfect bend super sexy just need it to go under the right foot peg lug on the frame. So I’ll cut this nos vintage header as a sacrifice , a show of dedication and resolve. Cut and add in a section , design a lower support , fab a baffle to fit inside muffler. Muffler will clamp on for easy replacement. Down swept pipe has a much straighter/easier bends for a less restrictive path. All it is , is a bent pipe , no flanges , so when my  prototype is done  I’ll have one bent to match  out of one section of pipe and then have it chromed !  A phototype to continue building  and eventually a custom one off  chrome header for a finished  bike. Way too much effort ?  Maybe  !  But it will be a defining part of this build.  Much of the build was to keep as much oem as possible ,  but here is where that ends. With a custom intake side and a ported head the exhaust side must perform as well. However it is my intention  to have a chrome exhaust with  real sexy bends that might be mistaken for a oem header. Cam is  the personality ,  it defines what your engine is capable of , so max rpm is set by it. Since  I’m not changing it , I only have carb & exhaust  to  gain throttle response.  Think I got it covered. Yeah when you start the build it’s all you but as it goes on it always begins to take on a life of its own. As if we’re bigger than you and now it’s telling you how to proceed. I may be hella sick but I’m in my element and recognize when  I’m no longer in control. Might be where I do my best work.
Stop thinking and mulling over it , let it tell me what’s next.

Wait, where did Ruttly go?  

250 project still moving forward. Some changes , mainly the tail light. Was going to use a small Lucas tail light but it isn’t oem but it is british. It doesn’t have much character and oem sticks out so far it always taking the hit. So I found an earlier 650 Lucas beehive tail light with cast aluminum housing , absolutely stunning and doesn’t stick out at all. Still fussing with exhaust , bought a 6’ section of 1 3/8 , only needed maybe 4” , but what’s left will get bent & chromed into a proper header. Send hubs out this week for wheels.
Slowed up a bit but moving forward.

Glad to hear you're on your way back Ruttly

My B50 TT bike has the 1/3 of a stator with 3 volt coil , a big Mallory condenser with stock points. The 5 degree advance unit welded , not advanced , with timing set on the snap , a happy medium between an easy bump start and hang the Phuk on. Good for racing ! Very era correct but front caliper and the grips , it’s only important to me to keep it vintage. The 250 will have a electric ignition to eliminate the points.

I bought a emgo throttle a 1/4 turn sidepull similar only in appearance to the old Maico/HUSKY/KTM. I should have known “ Emgo “ in another language stands for the 1st in quality on some other planet. Emgo should only be your last choice on this planet , check the box “your only choice”.
Anyways with the small displacement the 1/4 turn throttle should help a tad.
Cable is next , always a barrel of laughs !