I have read everything that I can on the o ring for the starter, but I cant get the stupid thing to stop leaking. I have changed 2 o rings and it does not help. Someone please help me stop this problem, I am almost ready to put a whole tube of the RTV in there so help me before I do. Thanks guys

 

What happens is that the "O" ring should be replaced once a year. If not, it becomes weak and ovals out a depression on the inside metal allowing the oil to go around it, new o-ring or not. The oval is on the center case - I used several methods including silicone with only moderate success.

Jed (650Viper) has mine now, you might ask him how he cured that.

 

Same here, mine has leaked for years. I have replaced the oring a couple of times and it helped a fair bit. I am not sure if there is a proper one or not but the one I installed was a BMW part. I may have the part number somewhere if you want.

 

I will give anything a shot, nobody has found a quick cheap fix. And another question, What silicone should I use, everyone talks about the blue RTV, is this the best stuff?

 

Larger diameter o-ring... I think its a 19. Search for the thread I had started a while back. Go to a nice hardware store, and they should have a large selection of o-rings, in different sizes. Mine leaked like crazy until I puit in the bigger ring.

 

Oh yea put it in with a nice layer of thick grease... not globs that can fill oil passages... just a nice thick film.

 

If you have tried different factory style orings with no sucess try finding a local.hyd hose and oring supplier.Most hardware and auto parts stores only carry Buna orings which are the dog chit of our industry try getting a silicone oring,or a metric half size larger,or switching to an american equal they are normaly a tad larger try changing you cross section size which is the size of the oring material diameter.size may not matter too the girls but it dose in the oring world.What i have seen in several bikes.Is belive it or not the buna oring gets hard pretty fast it then rubs on the alum surface and makes a over size groove that is the culprit it is not even noticable in most cases but 1 100th of a thousands counts in sealing.And one must remember your not sealing oil your actualy sealing air or case presasure. The oil is just a probuct in the case exhaust. good luck and and may the hands of thiessis guied you.


Black orings buna : No good for light sealing extremely strong in hi presure systems
Red mylar :Not the greates for light sealing pretty good in hi presure sytems
yellow silcone mylar :good for light to heavy duty sealing oils air ect.
green silicone haylar:Good for light duty sealing (Most commonly used in ac systems)
white pure silicone :Real good for light duty applications(mainly used in food grade applications)

 

I finally went the RTV rout. . .

I actually bought a new starter nose piece from BMW. . . found my starter o-ring was actually wearing down.

Thought about having The Preacher put a second groove in the nose piece to help too. . . never got around to that. I've. . .er, the new owner of my quad, has a new nose piece and an old one that perhaps he could try putting a second o-ring in and someone could try.