can somebody positivly identify this 110 piston

[hoosierlogger]

I know it is an over bore piston just dont know what brand. Honda rings are too thick to fit in the groves. Need a little help from the 110 gurus.

[Shorty]

Holy Big dome Batman! Is it a 61mm piston or 58?

[shortline10]

First look and see if its a 14mm or 15mm wrist pin to determine if its a atc 110 or a atc 90 piston . Looks like a Rocky 54 or 55mm to me . JCC was the piston maker but Rocky was most likely the distribator. I prob have rings for it just LMK what size it is .

[hoosierlogger]

Thanks shortline, It is a 15mm wrist pin. The piston measures 54.60mm diameter.

First ring grove measures 1.27 mm
Second ring groove measures 1.23 mm
Oil groove measures 2.50 mm

I need rings for it. I broke the oil ring when I was taking it off to clean it. the piston is marked 5 on the top assuming it is bored .050 over. Shoot me a PM with the price you need for a set of rings. Id like to have this going for Trikefest. What do you think the compression ratio is on this unit?

[shortline10]

Did you take that 54.6 measurement at the skirt or at the ring groves ? Sounds like its a 55mm to me . I have a NOS set of 56mm rings that you could file down but let me check on the ring thickness for you . Those 1 piece oil rings are tricky to replace with out breaking them .



Thanks shortline, It is a 15mm wrist pin. The piston measures 54.60mm diameter.

First ring grove measures 1.27 mm
Second ring groove measures 1.23 mm
Oil groove measures 2.50 mm

I need rings for it. I broke the oil ring when I was taking it off to clean it. the piston is marked 5 on the top assuming it is bored .050 over. Shoot me a PM with the price you need for a set of rings. Id like to have this going for Trikefest. What do you think the compression ratio is on this unit?

[hoosierlogger]

I measured it at both ends and neither end measured 55 mm. Ill see if I can get the bore measurement.

Yup thats when the oil ring broke when I was taking the damn thing off should it come off the top or the bottom?

[shortline10]

Oil ring comes off the top of the piston and you have to work it off dont try and spread it all at once or it will break . I have a few tricks for installing these but its hard to explain LOL .




I measured it at both ends and neither end measured 55 mm. Ill see if I can get the bore measurement.

Yup thats when the oil ring broke when I was taking the damn thing off should it come off the top or the bottom?

[hoosierlogger]

That is exactly what I did. I tried to take it all off at once. I almost had it too, it came off real easy after I broke it in half. LOL I am interested in the rings if you find any that will work.

[shortline10]

I believe the compression rings I have are to thick both measuring @ 1.25mm but the oil ring looks fine . I have a few of those pistons as well and the oil ring seems to fit in all of them . If your 2 top rings are good you could use my oil ring to get you up and going . 20.00 shipped for the NOS rocky ring set if you want it .