piston markings

[800screws]

i have a lrd lt250r engine with a spacer plate...it is supposed to use a 86 trx250r piston...the only marking the piston has though is a 474 underneath by where the wrist pin goes through....its also a 69mm piston...does this sound like a honda piston?

[atvmxr]

hi Brian,
Nothing on the top of the piston??

Sometimes it takes WD-40 and some scrubbing to get through the carbon..

[800screws]

havent gone that far....i was hoping the bottom mark would do the trick...ill try that this weekend


time to edit your profile!

[800screws]

is this a 250r piston?

[speedfreek]

Is there a window on the other side in the skirt?

[800screws]

no, no windows...solid all the way

[methyman]

Not a trx piston. The 87-89 pistons have a intake window in then and the 85-86 piston has a arch cut into the intake side of the piston. This piston has neither.

[speedfreek]

Originally posted by methyman
Not a trx piston. The 87-89 pistons have a intake window in then and the 85-86 piston has a arch cut into the intake side of the piston. This piston has neither. x2

[atvmxr]

perhaps its a yz piston, i know LRD used those pistons in some spacer plate motors too...

looks like your gonna have to the get the numbers off the top of the piston...

[fastrnrik]

The LRD LT250 spacer plate motor that I had used a YZ piston

[800screws]

i was going to do it locally, but i might just send it to LED.....

[800screws]

mystery solved...i scrubbed through the grunge...it is a 80 over 87 lt250r piston. got me wondering now, if the wrong piston was in there. arlan said it used a 86 trx piston and yz250 wrist bearing with the 3mm spacer plate? i sent him the info i found and i'll see what he says.