SOHC.co.uk Forums > Project Board
TL125S
Oddjob:
Yeah, looks to be different.
I've found 3x1.00mm over 550 pistons today Dave, they are not genuine by the look of them. Plus all of them have scoring marks down the side of the piston top down to the top ring groove, like something went down there at some point. Some are worse than others, they are flat topped BTW, same as the 500. What size would a standard 550 piston come out at?
McCabe-Thiele (Ted):
I've just read this whole thread again Dave, I salute your persistence in getting this far.
I would certainly have trouble sleeping at night trying to work out how to get past the obstacles you have encountered so far, only one word fits, respect Dave.👍👍👍
Bryanj:
Without being silly i think your best bet is to make sure you can get all the bits for the bottom end BEFORE worrying about piston and bore 0.5 mm o/s 550 is 3mm o/s for 500
Laverda Dave:
Thanks for the advice all.
I think I'm going to go with a standard 125cc especially considering this isn't my bike but a mates and he wants me to fit all the road kit (indicators etc) and as he's the same age as me (63) it's doubtful if he's going to go off roading. I've also discovered the big bore kits are marked as NOT suitable for road use, they are intended for trials riding where short bursts of high revs can be tolerated.
I'm playing safe with this one!
I would also think (hope) it will be a lot easier to get a genuine Honda oversized piston and rings for a standard 125.
Bryanj:
Dont buy a 0.25 till the bore has been done as i am finding a lot of 500/550 need to go to 0.5 as the liners have "barrelled" enough to not clean at 0.25.
You can have it done to a bit undersize then honed to fit piston
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