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What year is it/4 ring piston/Bing1/22/50
Posted: Sat 7. May 2011, 11:31
by bmwx5
I am restoring an R25/3 from 2 bikes.What is the production date of frame & engine no 328442 also frame no. 301550 & engine no. 328805.Both engines have 4 rings per piston and are size 68.5. One has 'Sp006'on it.What ring set do I need.Iam useing carby.Bing 1/22/50 what model is it from, where can I find a parts list for it.To tune it what notch do I set the float & slide needle in .Which jets & needle will make work best for my engine.This is my first post I hope Mark & someone can answer all my questions.
Re: What year is it/4 ring piston/Bing1/22/50
Posted: Sat 7. May 2011, 13:31
by Kurt in S.A.
The production models were 1953 to 1956 with over 47000 bikes produced. VINs ran from 284001 to 331705. Your 32xxxx numbers probably indicated a 1956 model whereas the 30xxxx number is probably a 1954 or 1955.
Piston size 68.5 is 1st overbore...standard size was 68mm.
My Bing catalog doesn't show a 1/22/50 carb. Documents I have show that the early bikes had carbs 1/24/41 and then from October 1953 they had 1/24/42. Your carbs are 22mm opening...the stock carbs were 24mm. Contact Bing for more information -
http://www.bingcarburetor.com/
Kurt in S.A.