My Sunl 50cc GY6 leaked oil from the base gasket even with brand new gaskets. I think the actual solution might be to have the cylinder's base and the cases planed or milled to create true flat mating surfaces. That can be costly and time consuming, so I tried something else that worked for me.
For anyone else that may have issues with the base gasket leaking, here's what I did :
- Cleaned the cases and cylinder's mating surfaces very well with gasket scrapers, then a block sander and some 400 grit paper, then I used a medium 3M scotchbrite pad to go over them lightly, and then finished cleaning using a shop towel with some brake parts cleaner. Make sure you give the brake cleaner time to evaporate before continuing. -Installed the knock pins/dowels in the cases. -Applied a thin coating of Permatex Ultra Black RTV to the cases, making sure to keep the cam chain out of the way. -I let the RTV set up for about 40 minutes. The instructions tell you to assemble immediately, but I've used this method on other things to get them to seal. -Installed the cylinder and continued installation of the top end. - Once the cam and rocker assembly was in, I torqued the 4 cylinder studs to 10ft-lbs and installed the 2 6mm bolts on the side fairly snug. -I let that set overnight. -The next morning I torqued the cylinder studs to 12, 13, 14, 14.5, and finally 15ft-lbs. I tightened the side bolts with a regular ratchet, since I don't have a wrench that goes lower than 10ft-lbs.
Last Edit: Nov 11, 2017 12:51:23 GMT -5 by 90GTVert
Brent Smoking section, please.
Senna1Rossi: Ah, gotcha! Thanks, Fox. Does everyone see the Shoutbox, or just the people who you choose?
Feb 16, 2016 12:39:35 GMT -5
Fox: Anyone who is logged in can see it but it's down at the bottom so most have either chosen to ignore it or haven't discovered it yet.
Feb 16, 2016 18:42:39 GMT -5
Deleted: Wow, I just found this. I feel smart now, ha ha.
Feb 27, 2016 19:24:24 GMT -5
Silar: Ahh.. New feature for a new riding season! YAY!
Mar 16, 2016 17:12:34 GMT -5
Silar: Apparently this still is not being used much. hmm..
Mar 17, 2016 13:55:04 GMT -5
180°off: Anyone want to buy a Yamaha 2t that needs a complete rebuild?
Mar 27, 2016 16:00:19 GMT -5
larryhobman: What is the leanest jet size you would try on a 47mm setup, 60cc stock head with a A9 cam
Apr 2, 2016 20:17:30 GMT -5
Senna1Rossi: Thanks renagade281!
May 23, 2016 14:59:12 GMT -5
Fox: I don't really know how to say this but straight. I am Dave's Girlfriend Kellilee and bluntly and VERY SADLY he passed away early Tuesday morning. I know he would want ya all to know this. Thank You Brent for befriending my love he was very happy on here!
Jun 18, 2016 16:26:04 GMT -5
Fox: www.gofundme.com/29mgf6b8 I hope it is ok to pass on his gofundme page link. If not you will un-post it I'm sure. Thanks again all!!
Jun 18, 2016 16:31:18 GMT -5