New Owner, Where Is The Engine Number?

[Kevin.E]

Hello, New 1969 TR6R Tiger 650 owner here, I looked at the engine, didn't see the engine number. It's running lean, won't fully come off choke, I'm not going to run it like that, it makes it run hotter. I want to find a carb kit and filter. Maybe it got varnished up. I checked for vacuum leaks on the two gaskets. I just want to get the right parts. If someone could help I would very much appreciate it. Thanks, Kevin

 

[Vector]

".. engine number is found on the left side of the crankcase (engine block). It is imprinted on the crankcase below the cylinder barrel."

 

[Kevin.E]

".. engine number is found on the left side of the crankcase (engine block). It is imprinted on the crankcase below the cylinder barrel."

I know that I’m going to feel foolish after this, but it’s the bike vin number. I read that there were two carbs in 1969 based on engine number

 

[Greyfell]

Vector is correct about the engine number being below the cylinder barrel, but there is more to it. From what seems the same page Vector went to:

"The motorcycle engine number length varies based on year but is often 6-7 characters.

On an unaltered, vintage Triumph the engine and frame serial numbers match. If they do not, that means that the engine or frame was replaced at some point in its history."

 

[Kevin.E]

Vector is correct about the engine number being below the cylinder barrel, but there is more to it. From what seems the same page Vector went to:

"The motorcycle engine number length varies based on year but is often 6-7 characters.

On an unaltered, vintage Triumph the engine and frame serial numbers match. If they do not, that means that the engine or frame was replaced at some point in its history."

Thanks, I’ve gone over it with a flashlight a few times. The VIN numbers match. No engine number. But I see that the carb is stamped 930 and I see that is a carb model number.

 

[Rudie]

The VIN numbers match. No engine number.

Your photo shows what is called both "engine number" and "VIN number":-

. It is called "engine number" because the Triumph works stamped everything in your photo on the engine when it was completed.

. Separately, when an engine was installed in a frame, the whole "engine number" was copied on to the frame.

. Most jurisdictions use whatever is stamped on the frame to identify a complete motorcycle.

. The collection of letters and numbers in your photo is sometimes referred to as "VIN" because it is an easy shorthand, as it appears on both engine and frame. However, it is not a true VIN because it does not conform to the international 17-character format.

. The actual number in your photo is the only thing that is unique to that engine (and the frame it went into), "CC" is the date code for March 1969, would have been stamped on all engines made in that month, "TR6R" would have been stamped on all TR6R engines made at any time.

While the month is always the calendar month, the year is never the calendar year, always the "model year"; sometimes they are same, but sometimes they are not.

the carb is stamped 930 and I see that is a carb model number.

"9" indicates a 900 series Concentric model body, "30" is usually (but not always) the nominal diameter in millimetres through the carb from inlet to engine side. The number to the right of the "/" indicates the internals (jets, needle, slide, etc. combination) fitted originally, usually indicates the motorcycle the carb was intended for, but not always.

Concentric bodies normally stepped in 2 mm. increments. However, if an intermediate diameter was required, that was indicated by a stamp to the left of the cast body/diameter.

 

[Kevin.E]

Your photo shows what is called both "engine number" and "VIN number":-

. It is called "engine number" because the Triumph works stamped everything in your photo on the engine when it was completed.

. Separately, when an engine was installed in a frame, the whole "engine number" was copied on to the frame.

. Most jurisdictions use whatever is stamped on the frame to identify a complete motorcycle.

. The collection of letters and numbers in your photo is sometimes referred to as "VIN" because it is an easy shorthand, as it appears on both engine and frame. However, it is not a true VIN because it does not conform to the international 17-character format.

. The actual number in your photo is the only thing that is unique to that engine (and the frame it went into), "CC" is the date code for March 1969, would have been stamped on all engines made in that month, "TR6R" would have been stamped on all TR6R engines made at any time.

While the month is always the calendar month, the year is never the calendar year, always the "model year"; sometimes they are same, but sometimes they are not.


"9" indicates a 900 series Concentric model body, "30" is usually (but not always) the nominal diameter in millimetres through the carb from inlet to engine side. The number to the right of the "/" indicates the internals (jets, needle, slide, etc. combination) fitted originally, usually indicates the motorcycle the carb was intended for, but not always.

Concentric bodies normally stepped in 2 mm. increments. However, if an intermediate diameter was required, that was indicated by a stamp to the left of the cast body/diameter.

Thank you very much for your explanation and your time.