Jap engine dating

While we all would like our cars to last, sometimes we have bad luck with our engines.

The motor could simply be a lemon, or maybe it burns oil and needs to be replaced.

All Atco motor mowers produced during this period had either Villiers two-stroke or JAP four-stroke engines.

Both engine manufacturers numbered their engines and it is often possible to date a mower from these, bearing in mind that the original motor could have been replaced at a later date.

I would like to keep the vintage pre-war but I don't see much visually different from the 30s bikes and the last of the JAPs, so any small details I would need to attend to that you might point out would be helpful. I see many beautiful restored bikes on your site but personally would walk right past 10 of those to drool on a battered old soldier in "as raced" condition with scars, bruises and makeshift trackside repairs.

Enclosed are a couple pictures, the first bike I made, albeit crude, its inspired by a late teens-early 20s board track racer and was fitted with an engine made from a weed whacker.

The numbering and dating of JAP engines is covered by this list of JAP engine dates and this alternative list of JAP engine dates.

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Thanks, JB Hoffman John says: Hi JB I like the pics of your creations.

It is not easy to date Atco mowers made before 1939 with any precision.

The company does not appear to have numbered its mowers or used any systematic dating process.

USA JB Hoffman says: Greetings John, from Belle Fourche South Dakota, USA (very near Sturgis) John, I am an old retired mechanic/welder and with some time on my hands I dabble in metal art which has taken me to building 1/4 scale motorcycle sculptures inspired by vintage racing bikes.

I am now completing one inspired by the n1923 Ace that Red Wolverton set a speed record nearing 130 mph.

Jap – Model CH Pugh 50cc Parts List Jap Crank - Main Bearings English and metric Jap Model 3Jap Part Codes 4-2 4-3 5 - 55 – 6Jap Model 2 A Jap model 2A Carburettor Jap 2S 98cc Ref Book - Part List - Price List Jap model 4-2 4-3 5 and 6 Jap 4-3 and 5 Type 40 - 41 – 53Jap 16 H Magneto and Carbs Jap 34 B - RS -S Maintain – Instruction Jap 34c Carburettor Jap 55 CB Series JAP 125cc and 150cc Parts list 1962JAP 500 750 part numbers 1956Jap 512 - 515 H series 125cc Jap 600 sv Direct f start Jap 600 SV Mk 3 Type 8Jap 600 SV Mk 3 Type 9Jap 600 SVJap Crank Shaft and Bering info Mod 4-3 - 5 and 6Jap GS 8JAP ID coder for Motor Cycle engines JAP ID codes for Motor Cycle Range Engines JAP ID cods for Industrial Units Jap industrial 50 to 150cc Series 50xx and 51xx HJap Industrial engines Date info 1946 to 1958jap JRS8 Type5Jap Mod 0 34cc instruction Parts Price list Jap Mod 3 Codes Jap Mod 3 Stors code Reference 1955jap Mod 4 F 186cc Jap Mod 55 – 824cc JAP Mod 80 Factory Specifications Sheets pt1Jap Mod 80 IDJap Mod 80 Parts Jap mod 80 -Type 20 Parts list 3jap model 0Jap Model 40 - 41 – 53Jap model Two Stationary engine JAP part Numbers Sheds Mod 2A 2SJAP part Numbers Sheds Mod 4FJAP Parts List 10 20 15 20 25 40 1956JAP Quick Ref 2A and 2SJAP service Bull 113Type 3 1960JAP Service Bull 121 122 1 – 1963Jap Service Bull 1955 – 1958JAP Service Bull Sep 1958JAP Service Depot Information MK 10 to 40 1954JAP service info 1960s Jap User 7 - 10 - 12 – 15jap Model 4-2 Jap Mod 3 Type 28Lister Auto Truck Jap power unit Part Numbers 2 series Sea Bee 4 HP Manual Sea Bee Minor Sea bee outboards Jap model 80Zenith carb Parts All the work is completely re mastered and restored to this mechanics archive.

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