saddleback

Back to A.Graham Bells book. He says the small holes and worm ports in the cylinder liner are to cool the piston crown .They promote airflow under the piston crown. Dean

My fathers model 49 Sherpa T had a reed installed in 70 or so. A DH reed install by a Mc Collough engineer . Dale Herbranson? A small 4 petal reed with two boost ports,actual ports cut in the cylinder not slots as is the normal now. Anyway the engine became very responsive not always a good thing in a trials section. A new liner was fitted and tuning was returned to stock. I still have the bike it's a 325cc round barrel now. More on that if anyone is interested. A.Gram Bell's two stroke tuning book has a article on adding a reed on a matador with 360 degree open timing and a power port setup. With dyno results. A good read. Thanks. Dean

Hi, The 58 or 59 mm sounds like a possibility.. In A.Graham Bell's book two stroke performance tuning he talks about a old Bultaco matador(model 26 ?) as having a inlet open period of 150 degrees. As the two engines are so similar ,before altering to piston the timing in degrees needs to be checked out. Thanks much for the help. Dean

I have a Bultaco model 212 250 alpina. The piston in this bike has a full length skirt on the intake side. Would anyone know how much a stock piston intake skirt is shortened? Thanks. Dean

Hi ,Just a thought to use with the 64mm crank. The model 213 Alpina has a 64mm stroke and a 83.2 mm bore, as listed in my 212,213 owners manual.Might come close for Trials bike port timing.. Dean

You might try holding your finger over the bleed hole when you tickle it.. You can't get my 92 started if you don't do it that way.. Dean

Hi , After you have the threads repaired .Use a exhaust nut for a pursang. The one for a slip in pipe with springs to hold the head pipe in.End of problem you never have to remove the nut again..My model 49 #31 has had this mod done around 1970.. Dean

Hi, Way back in 75 my 136 360 pursang was fitted with double row bearings on both sides(mag and primary). The engine was much more smooth after that.It's the same bearing as used in a El Bandito clutch hub..The seal plates and the spacer needed some rework..Don't remember the exact details too far back.. Dean