Maintenance & Technical > KX500 Original

If only it was the crank seal

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kiwikx500:
Mr Green dealership stripped the 5 hundie heart down to replace the crank seal only to find the "nice honest bloke" that sold the bike to me had put a sleeve in the bore, fixed for non movement by two grub screws and the sleeve about 5mm short of being flush.
Causing the head gasket to blow and tracking a line in the gasket from a water jacket to the bore.

The crank seal was totally destroyed and the housing for it is now oversized, the main bearing has pitting from water, the oil drain plug was fixed mainly with locktite as the thread was down to 1 1/2 turns.

The dealer said the crankcase will need some sort of oversized seal, crankcase will have to be sent to an aluminium welder/engineer and a piece added so plug can be secured probably (he worrying about warp-age with the heat)

Anyone had similar jobs that needed to be done RE the over sized crank-seal and stripped drain plug thread ?

don46:
I've seen alot of drain plugs that had heli coils in them, they seem to work just fine. As far as the seal I've not heard of that, but have seen the bearings wallow out the races and end up with sleeves in them. In fact I've seen and heard of quite a few. I think the crank gets out of true and causes the bearings to rock in the races and eventually the wear allows enough movement for the bearing to spin in the cases.

fluffy:
kx 500 engine at j w s cycles on ebay.700 bucks

don46:

--- Quote from: fluffy on August 02, 2007, 12:31:53 PM ---kx 500 engine at j w s cycles on ebay.700 bucks

--- End quote ---

Yep, and you might have the same thing you have. If you plan on keeping the bike I would fix what I had, then you know what you have.

MadKaw:
HUGHES has one for sale on here in the ads.

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