Engine marking (external)

[croat1]

I find this cool so I figured I would share....factory assembly/inspection marking.  On a number of places the engines were paint marked.  Here’s a few for now.  I’ll post the other external locations soon and then I’ll post what I found internally.

Clutch cable mount, actuator arm and left rear cylinder nut.  The cylinder nut is hard to see but the 3 locations I mentioned have a blue paint mark.

[croat1]

Exhaust manifold top mount bolt marked in blue.

[croat1]

Clutch cover bolt and coolant fitting marked in blue.

[croat1]

More external marking.  Carburetor cap, choke and vent line.

[croat1]

More carburetor.

[croat1]

Carburetor again.

[croat1]

Last carburetor

[croat1]

The pictures I have already shown are from a 1985 ATC250R.  The following pic is from a 1986 ATC250R.  Blue mark on the case vent T.  I did not see this mark on the 85 atc engines.

[Hawaiiysr]

Joe have you ever seen "A" or "B" markings on cylinders?
I thought the talk about it was BS until I seen it for myself.
I may have a picture. Let me dig around

[croat1]

1985 atc250r Cylinder intake with a yellow mark.

[croat1]

Bottom of intake with some numbers in white.

[croat1]

Joe have you ever seen "A" or "B" markings on cylinders?
I thought the talk about it was BS until I seen it for myself.
I may have a picture. Let me dig around

Josh, yes I have seen the marking you mentioned.  My 87 cylinder is marked ”B”.  The 85/86 atc250r cylinders do not have the “A” or “B” marking.

Joe

[broken1]

I have some 86 trx cylinders with the A stamp & I think 1 with the B stamp. If I remember right it had something to do with piston/cylinder clearance or something to do with the bore.

[croat1]

1986 atc250r kicker shaft with a blue mark.

[croat1]

Once again 1986 atc250r with a blue mark on the end of the kicker shaft.