Maintenance & Technical > KX500 Original

Anti-freeze in Exhaust ?

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kiwikx500:
Pulling motor out at moment to have crank seal replaced, a cup of water/anti-freeze ran out the exhaust, last time I took it out was the first time I had seen the white smoke that is talked about being a sign of a leaking crank seal.
The bike was struggling at low revs but was running alright mid to top range. I came to a small rise and turned the bike around and it died and I could not restart it (5km from van :-o)
Do remember before the second time out topping up fuel tank with petrol that had been sitting in my damp garage for months (bad move) and did see water in petrol when drained the carb, radiator level had dropped a cup.

Am I looking at something major ?

Thanks

BigGreenMachine:
Could be simple like a blown base/head gasket letting antifreeze into the combustion chamber. Could be bad, antifreeze washes the fuel/oil mixture off the cylinder walls letting the rings fry and potentially ruin the cylinder wall. Check your big end bearing and crank bearings while your in there.

Chances are if one seal is bad they both are....which means at low rpm the motor is getting more oil from the tranny side crankseal making the bike rich and then at mid/top rpm its getting more air from the magneto side crankseal making the bike run lean which will feel like it has more power and at the same time potentially lean seize your motor.

James

Hillclimb#42:
 If you need crank seals you probably need piston and replating anyways. Like Big green was mentioning that the anti freeze is causing havoc with bearrings and mixture. Bottom and top rebuild. Better to be safe than sorry, and will be cheaper in the long run. I always use an exhaust plug. It eliminates moisture from condensation and pressure washer. Not to mention mud daubers or mouse nest. A clogged or wet exhaust can be tough to find, but can definately cause a world of trouble.

kiwikx500:
Thanks guys much appreciated. :-) Mr Honda had the right idea with the CR 500 allowing for the crank seal to be replaced with the motor still in the bike. oh well dirty 5 quicker, life's a balance.

Good day to all.

kaw rider:
if you are doing crank seal then you should do the crank and cylinder.

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