Bottom end oil seals?…
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Does anyone have the size measurements of the oil seals needed for the bottom end? Or part numbers for genuine Yamaha items? I have genuine ones for the mains, so I need:
Sprocket shaft
Gear change shaft
Water pump
Kick startAny I’ve overlooked
Ta for any help…
PS: Also the size or/& part number for the primary drive/output shaft (stator side) roller/needle bearing, if anyone can help…
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Also, does anyone have any strong opinions about which sealant to use, or not, to join the two casings? I used Hermatite red semi hardening last time with no leaks. I’d really like to know if there’s some proper premo shit out there that I don’t know about?…
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@SpookDog I used Threebond 1104 when I did my bottom end, it's no longer available but they recommend this for motorcycle crankcases in its place:
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hylomar blue is normally my choice of Gasket Sealent
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Good enough for Rolls Royce! Funny how we shy away from RTV silicon sealants. An age thing maybe?
I still don’t really trust them, I know that’s stupid but I’ve taken apart engines that have had loads of excess sealant floating about in them like giant snots. Not so important in a 2T but can really spoil a 4T’s day if it gets in an oil way…I suppose you just have to get the bead just right?…
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@SpookDog nice thin even layer let the solvent dry and it should always do the trick , I can imagine people putting on excessive amounts tightening the case and it spilling out in the case, I repair industrial gear boxes for work and we always use it for them too and that’s a 24/7 running gearbox and it will last years
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@mhbikesnbits Yeah, I can barely tie my shoe laces so it's definitely a technique thing.
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I doubt rolls Royce were using hylomar to seal 2 stroke crankcases though. Yamabond, hondabond etc (threebond 1184) as stated in all the official workshop manuals, is the thing to use. Using anything else your just introducing another unknown. With all the issues you've had I'd be trying to illuminate unknowns.
