TRX250R.ORG

General => Pics and Vids => Topic started by: croat1 on January 21, 2021, 08:18:50 PM

Title: Engine marking (external)
Post by: croat1 on January 21, 2021, 08:18:50 PM

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.

Title: Re: Engine marking
Post by: croat1 on January 21, 2021, 08:20:17 PM

Exhaust manifold top mount bolt marked in blue.

Title: Re: Engine marking
Post by: croat1 on January 21, 2021, 08:21:27 PM

Clutch cover bolt and coolant fitting marked in blue.

Title: Re: Engine marking
Post by: croat1 on January 26, 2021, 10:53:19 AM

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

Title: Re: Engine marking
Post by: croat1 on January 26, 2021, 10:56:59 AM

More carburetor.

Title: Re: Engine marking
Post by: croat1 on January 26, 2021, 10:57:57 AM

Carburetor again.

Title: Re: Engine marking
Post by: croat1 on January 26, 2021, 10:58:49 AM

Last carburetor

Title: Re: Engine marking
Post by: croat1 on January 30, 2021, 10:17:47 AM

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.

Title: Re: Engine marking
Post by: Hawaiiysr on January 30, 2021, 02:16:43 PM

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

Title: Re: Engine marking
Post by: croat1 on January 30, 2021, 05:37:33 PM

1985 atc250r Cylinder intake with a yellow mark.

Title: Re: Engine marking
Post by: croat1 on January 30, 2021, 05:38:52 PM

Bottom of intake with some numbers in white.

Title: Re: Engine marking
Post by: croat1 on January 30, 2021, 08:21:12 PM

Quote from: Hawaiiysr on January 30, 2021, 02:16:43 PM

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

Title: Re: Engine marking
Post by: broken1 on January 30, 2021, 09:20:33 PM

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.

Title: Re: Engine marking
Post by: croat1 on February 04, 2021, 08:08:19 PM

1986 atc250r kicker shaft with a blue mark.

Title: Re: Engine marking
Post by: croat1 on February 04, 2021, 08:10:16 PM

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

Title: Re: Engine marking
Post by: croat1 on February 04, 2021, 08:30:12 PM

That’s about it for external markings on 85/86 ATC250R engines unless I missed some that were worn off from age.  The pictures in this thread were of take out engines (never fired).  Unfortunately I do not have any clean 86-89 TRX250R engines to look for factory markings.  If someone does please post up. 

Maybe one day this info will help a guy that’s doing a 100% true restoration.

I will make another thread about internal engine paint marks.

Joe

Title: Re: Engine marking (external)
Post by: croat1 on March 09, 2021, 09:21:55 PM

Oops found one more external mark.  Blue mark on the shifter pinch bolt.

Title: Re: Engine marking (external)
Post by: broken1 on March 10, 2021, 12:10:35 PM

Is there any marks on the oil drain plug?

Title: Re: Engine marking (external)
Post by: croat1 on March 10, 2021, 07:42:20 PM

Quote from: broken1 on March 10, 2021, 12:10:35 PM

Is there any marks on the oil drain plug?

Kevin, great question!  I’ll look this weekend.

Joe

Title: Re: Engine marking (external)
Post by: croat1 on March 14, 2021, 12:43:15 PM

Numerical “code” in white on the bottom of the cases.

Title: Re: Engine marking (external)
Post by: croat1 on March 14, 2021, 12:43:55 PM

Blue paint mark on the oil drain bolt.

Title: Re: Engine marking (external)
Post by: croat1 on July 31, 2021, 01:49:31 PM

Not factory but notice the label on the stator cover.  Dealer sticker after taking the engine out.

Joe

Title: Re: Engine marking (external)
Post by: croat1 on April 14, 2022, 02:35:22 PM

White mark (dot) on the coolant hose (water pump fitting). 1985 ATC250R.

Joe

Title: Re: Engine marking (external)
Post by: croat1 on January 24, 2023, 03:40:36 PM

A 86 atc250r engine with a label on the stator cover