Ok I re-designed the starter arrangement. This time I am using a Royal Enfield sprag. I machined a sprocket to take two 12mm x 28mm x 8mm bearings on the inside and a 35mm x 40mm x 12.5mm needle roller inner ring. This is pressed and Loctite (648) on. I machined an outer race for the sprag from "gauge plate" which will be oil hardened, this is held on a carrier keyed to the central shaft. A bearing housing completes the ensemble.
The whole job looks great Andy, if you stir up that iron thing it will make a good bit more heat , considered an oil cooler? My iron sporster got the oil too hot to touch in 6 miles. Great persistence on the leccy leg, it will be a boon when sorted.
Remember the home plating stuff , forget my method, get a kit would be my advice, results in the real world 2 out of 10.
71 Devimead A65 750 56 Norbsa 68 Longstroke A65 Cagiva Raptor 650 MZ TS 250 The poster formerly known as Pod
I bought a little 2KW muffle furnace, this had been used for enamelling and the only control was a " stove hob type" power regulator. I built a little control panel with a K type thermocouple controller and SSR regulator to give reasonably precise temperature control. Today I put my sprag clutch outer housing in it and warmed it up to 500 Deg C to pre-heat soak, then increased the temperature to 800 Deg C. After allowing 1/2 Hour at this temperature I dunked the housing in ex Aprilia engine oil. I then allowed the furnace to cool to 250 Deg C and after cleaning the oil off I put the housing back in the furnace for an hour to temper. Tomorrow may be the big try out of Mk 3 starter
The carburation needs sorting out yet, it is as rich as Bill Gates. Next weekend I have entered the British records event at Elvington with both my Greeves and B31, ideal place to sort the carburation with a 2 mile long runway. I hope I can get timing tickets for both bikes at 100+MPH
I had a quick twiddle with the pilot air screw, set it to 3 turns out instead of 1 1/2. That made it slightly lean at idle as evident by the occasional spit back but then as I open the throttle it goes back to rich. As I have not tried it under load yet, I have only run it on the full diameter of the needle. I deduce from that the pilot jet is probably close and the needle jet is rich. I will put in a leaner needle jet and try again. After work I made up a cable and fitted the handlebar lever choke instead of the button on the left (hard to reach) side of the carb. Its so easy to make cables with a birdcage tool and solder pot
MOT is done. I rode down to the MOT test station, the engine feels lovely and smooth, the exhaust note is glorious deep yet staccato sound. I have a slight issue with the gearbox, when down shifting sometimes the lever sticks, I need to hook my toe under it to nudge it back to the central position
Over the weekend I entered the records meeting at Elvington. The B31 behaved beautifully, fastest one way standing start mile 85MPH. The bike is very smooth, it would be comfortable at 70MPH all day. I have a very slight oil drip from the clutch case but that's all. Wilf, the levers are replica Tomaselli matador alloy levers. I modified the brake lever to a compensated twin pull
Those lever clamps look so much better than almost anything else....especially the ones that are so thin that the whole thing can't help but flex when used. I must keep an eye out for something like that.