Honda 250r cylinder head info wanted!

[Madmike10]

Just wondering if anyone has any info on the different263486263487 cylinder heads for the 250r. I wasn’t even aware there was different ones till I got this one that has ha2 on it and a very small chamber and no it hasn’t been re cut.

[ironchop]

There's a thread in here somewhere where someone pointed out how to ID all the casting markings and differences between 85 and 86 ATC250R and 86-89 TRX250R cylinders and heads. I'll post of I can find it but here's a free bump for someone else to chime in

[yaegerb]

The 88/89 had a really small dome, 87 was a little larger and the 85/86 had the largest one.

[Madmike10]

The HA2 is trike only that’s why I’m at a loss was It maybe a race head sold through Honda ?

[ironchop]

The HA2 is trike only that’s why I’m at a loss was It maybe a race head sold through Honda ?

No, the 85 and 86 ATC250R AND the 86, 87 TRX250R ALL had "HA2" in the middle of the part number.

The 88 and 89 TRX250R, on the other hand, had "HB9" in the middle of the cylinder head part number.

I looked it up on the Honda OEM parts fiche to be sure.