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From the number, it was made AFTER 1945 (when they started to feature a model code before the serial number), but before 1969 (Triumph changed its serial numbering system to include a two-letter prefix to denote month and year of manufacture, followed by model code and serial number).
The "H" denotes that it is a 500 twin model.
The 1961 production run ran from H18612 toH25251. Your number falls into this range, so yes, it's a 1961, 500 cc engine, and the model of bike it came off of is called a "Trophy 500".
Ask at the relevant dealer. You don't give make, model or whether it is an engine or chassis.The number is not relevant to any motorcycle of which I am aware. An engine or chassis number will usually be a mixture of letters and numbers.
On most bikes there is a frame number on the steering head of the frame when you turn steering to full lock to the left you should be able to see it? if you record this number an call your local dealer for the bike they will have data to confirm age year of manufacture
The frame number is the Vehicle Identification Number. If the engine is the original engine, then the engine is the same year as decoded from the frame number. If it is not the original engine, you are hosed as to determining the year of the engine. The engine numbers will not identify what year the engine is. The only identifier is the frame number. Engine numbers are useless since they only denote the engine size, assembly plant, and sequence of that engine in a production run. You can go to the site below and enter the frame number into the VIN decoder to get the year and other information. Note; back in 1985 the manufacturers adopted 17 digit VIN. If you have less than 17 digits you are out of luck. Please rate my answer. Thanks. http://www.motoverse.com/tools/vin/kawasaki.asp
The chassis number(s) will not give the year of the bikes. The engine number(s) will give the year and location made of the engine only. This information would have to be obtained from the manufacturer.
The only way to determine the year of the bike(s) is to use the VIN number. The VIN number is 17 characters long and is usually located on the front of the frame.
This site, VIN Look-up, will give you all the information you need on your bikes.
Hope this helps and if you find this post useful, please vote. Thank You.
Not to be flip here, but just pick up the phone and call a Yamaha shop and ask them. Other options are to look at your title, and examine the frame. A decal or metal tag with year and other info should be found on a frame tube under the seat, or near the output sproket, or on the frame ahead of the gas tank.
so according to his book my bike does not exist. The book that he is using is titled something like Ducati v twin restoration guide. He is a good mechanic but I would like to find out more before proceeding further with the restoration. Can anyone help ?
Thanks in advancehe numbers on the frames and engines mean nothing when working out a model and age.
In the factory engines were not matched to frames via their numbers they were simply put together. Any book that gives definite numbers for a model is full of sh!t. A good example is all the pics you see of crates of engines in no particular order. There was no need for an engine to match a frame number so they never went to the trouble.
The engines were used in many models and bikes, including your era, the Cagive Elephant etc....
Your bike is probably correct, even though the book says it shouldn’t exist. The numbers for the books come from the first number to just the last number, and are not necessarily relevant for any number in between.,,,