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Exciter 570 Base gasket problem

2K views 4 replies 4 participants last post by  VmaxSteve 
#1 ·
so last year i purchased a 1987 yamaha exciter 570. the engine was rebuilt 200miles prior and it ran great. i did some basic repairs and bled the cooling system. a little while later it blew the base gasket and leaked coolant everywhere so i took it apart replaced all the gaskets and put it back together it ran great but now it has blown the base gasket again any ideas?
 
#2 ·
Improper torque, cheap or wrong base gasket, or some weird over pressuring of the coolant system from a bad thermostat.

Do your cylinders have an oblong shaped rubber plug on the bottom blocking one of the coolant chambers? Now I am going to have to look at one of mine and see.
 
#5 ·
There could also maybe be a chunk taken out on the surface of one on the mating surfaces where someone used a little bit too much pressure with a gasket scraper.
 
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