Lapping
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LC motors are alloy and it seems to be a wide spread practice with the aircooled and watercool boys back in the heydays.
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@Bluestoesonnose I know LC motors are alloy, I was specifically referring to the AC motors since I'd expect this to be where it would work reliably.
But I've not heard anyone do it to DT's. I guess there must be a reason why it's not so common these days.
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Not totally clear in your reply
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@Bluestoesonnose I'm not saying it's not possible, I do question it's reliability. O-Ring modification would probably be your best bet. But the discussed factors should be considered.
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The O-ring conversion on a DT 125 using a 90,s YZ 125 O-ring , the tighter squish and less combustion volume really helped. On average I would say this mod gives around 1,0 a 1,5 HP. This will lower the squish from +/-1.35 to a +/-0.95mm
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@2stroketerry That looks the tits. Who did that for you?
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Cost £30 to cut the groove from a machine shop in Southbank
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@2stroketerry I’m surprised you lot like the o rings I hate them with a passion I love the simple metal one like dt has I’m always having leaks and such from poorly fitted o rings even though I try my best to fit them perfectly
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@Calum none of that worked for me they wouldn’t sit still the last one I did I used the lightest amount of super glue just enough to keep it in the groove and that worked any other time and it would always slip out an pinch the ring I should add this is on the cheap replica rs cylinders so the machining wasn’t exactly flawless
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@declan using glue is the last thing you want on an O-ring just a bit of silicone grease, but having a poorly machined groove the O-ring sits in probably doesn't help.
Yamaha use an O-ring on there best 125 cylinders the SP although don't actualy make that cylinder themselves. -
I seem to remember someone once said that applying a bit of petroleum jelly, aka the good ole Vaseline works wonders for keeping your 'O' ring in good order.
:grinning_face_with_smiling_eyes: :winking_face: :grinning_face_with_smiling_eyes::winking_face: :grinning_face_with_smiling_eyes:
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@2stroketerry the only bike I didn’t have a problem with was a yz 125 that was no issues what so ever
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