Just a few specs here about HOTBYK.
Chromed Kosman torsionally braced box section swing arm +6", raked & braced frame with the removable slipper tubes over the motor, tapered roller bearings in the steering head, blue anodized Mitchell solid wheels, Performance Machine 4 piston calipers and master cylinder, drilled rotors, thermostat controlled oil cooler, mural on the tank, home made seat (I had a local upholstery shop do the sewing) and every bolt was relaced with polished SS allen heads - painted metallic blue inside after torquing. All exhaust was ceramic coated internally after being re-chromed. Water / alcohol injection and air shifted.
I am down sizing to a rayjay B-25 turbo for this next incarnation. This new motor is NOT going to be a racer. It will be pump gas only and probably never going to see 5 psi boost. All my biggest and best motor stuff will of course be used but this is just to be my cool cruiser, with smooth, PREDICTABLE torque at low RPM. (Ask any turbo guy about that last statement for clarification!) A smooth 1/4 fairing, chin spoiler, and unobtrusive but observable turn signals are the more important things.
The 736 cc motor currently in the bike is a small but stout, low hour piece and just fine for the moment. At one time it was my stock, then super stock National record holding motor.
With the F-2 head I ran into VALVE to VALVE interference when I had the RC 315 cam in my Cobra motor, the piston pockets were generous and not an issue if the cam was timed correctly. Some careful seat work (aka 'sinking the valves') got me about .050" clearances with 80 cfm flow intake / 81 cfm exhaust. In 1979 that Cobra motor ran 170 mph as observed on the speedo. I have carefully watched that speedo many times on the drag strip and at a clocked 142 it reads 2 mph fast, so I do think I was really flying there. I must say that was quite fast back then for a street legal motorcycle.
The Bruce Springstein song 'Glory Days' comes to mind here!
The oil drain line from the turbo is directed from the bottom of the housing to the filler in the case with absolutely no problems, similar to other photos I've seen posted on here. I've had another turbo bike that DID have seals go out and the smoke clouds let you know strait away of that issue, but I suspect that since it was used, this was most likely an issue of it's prior abuse related to wear or oil coking due to improper warm up, cool down, or just plain broken down / improper oil.
