matting cases(leaking cases)

[frog]

I just changed my crank (all new seals).I did a leak down test and it only held for 3 minutes .So I checked with the soapy water found no leaks.Installed clutch cover and check the vent tube in water and what do you know bubbles.Took it appart again and check matting surface and I could see a little flaw on pto side(could see gasket glue).I put a thicker layer yamabond gasket to try and seal it, put all back together and did another test and it failed again. Can I resurface the matting surfaces with 400 grit sand paper on a 5\8 thick glass. I did this with my kx 250 to clean up the surfaces and had no problems.Hope this can be done to these cases to seal them up.

[SAVAGE420]

I would try and clean it up as smooth as i could and try again with a lil extra yamabond. (I prefer 1211 myself.)

 

Take a pic, i want to see exactly where your talking about.

[Larry's Shee]

If you have a boo-boo that creates a high spot take a small fine file and knock it down.

[frog]

It's a low spot.I marked the cases with a permanent marker and did a rub on the sand paper glass and its all even except on the spot on the pto side.Low spot still black as night.How much material can I remove. I did both the top and bottom.Top is perfect.Can I just put a thin layer of jb weld to fill the imperfection and sand it smooth.Its on the intake side of the case about one inch wide by gasket width.My camera is on the blink so I can't show pixs.How much material can I remove before I have to buy new ones.

[robert0762]

I would put a lil extra yamabond on there . Also a place to seal up is the woodruf key on the clutch side and it must be torqued down to get a good seal . I know from experience now i put bond on the key and a lil in between the drive gear and waterpump gear

[sleeper06]

primary drive gear will leak as stated,how low is it? I could probably weld it and mill it but i cant see that being your prob,use threebond 1211 let it sit overnight,are you sure your seals are good?

[frog]

Well I put jb weld and resurfaced them on the glass and sand paper.Surface is perfect.It took quite a bit to bring it back.Hope I didn't take too much material off . I installed the crank in the cases without the yamabond and seems pretty good.Well wish me luck.I Never had any problems with my other banshee cases .I bought the bike with a seized crank.Who knows what the guy did to it but for $500.00 for a 2001 I'll take a chance.

[SAVAGE420]

Awesome, keep us posted how it turns out after.

[T_Shee]

yep i think you did the right thing. let us know how it turns out. thank god for leak down testing

[banshee_R1]

I used threebond 1194, from what i was informed it is just like yamabond.... But havent seen it mentioned here, Hope it works

[frog]

So I just did the leak test and only lost 1\2lb after 15 minutes so I think its OK. I won't lie I thought I removed to much material to reseal the cases.I never knew anything about a leak down test before I joined this site .THANKS for all the great how to articles and also a big thanks to all the members .The dealer here told me the cases had very little play room and mine were finished. Guess I was lucky!