Trog Posted January 19, 2022 Report Share Posted January 19, 2022 Just to say Hi....just delivered yesterday is my 250 Sherpa. had a Miller High boy 250 back in the 90's and sold it to fund my road racing. bad move!! Anyhoo, Iv got a frame number PM 15000445 and engine B 8002817, any ideas on the year and model? Quote Link to comment Share on other sites More sharing options...
feetupfun Posted January 19, 2022 Report Share Posted January 19, 2022 https://newellmotorcycles.com.au/pages/bultaco-history your frame is a model 150 and your motor is a model 80. Open the link and you will find the years for your frame and motor Quote Link to comment Share on other sites More sharing options...
Trog Posted January 19, 2022 Author Report Share Posted January 19, 2022 many thanks Quote Link to comment Share on other sites More sharing options...
Trog Posted January 19, 2022 Author Report Share Posted January 19, 2022 OK, 75 bike but still not sure on the engine, ACU now allow AVGAS ? what is the mix going to be? Quote Link to comment Share on other sites More sharing options...
woody Posted January 19, 2022 Report Share Posted January 19, 2022 (edited) The engine is dated in the same way, as from the factory the engine and frame numbers matched, apart from the letter prefix, so your engine is from a 1971/72 bike. There is no difference in performance between this engine and the original engine. Apart from the clutch cover they look the same. There are however a few internal mechanical differences so it is important you give the engine number when ordering parts I don't know about Avgas Edited January 19, 2022 by woody Quote Link to comment Share on other sites More sharing options...
Trog Posted January 19, 2022 Author Report Share Posted January 19, 2022 Thanks Woody, Been 35 years since I messed around with a "ring a ding" { 2 stroke}. lots of stupid questions to be answered!!! looking forward to some fun days out and not to many engine strips!! Graham Quote Link to comment Share on other sites More sharing options...
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