YICS repairs

[tben]

My bike has been running for a couple of days now but it would not return to idle after warming up. It just rev'd perpetually at 3-4k rpm. I removed my YICS and this solved the problem i.e. vacuum leak. My question now is how do I repair this thing? I have tried once. I cut it in half with a razor, filled the groove and any holes on the rim with JB weld, sanded both sides flat and smooth, coated both sides with Red RTV and put a gasket between them. It was sealed when I tested it before putting it on the bike. Now, it looks like the pressure from the engine has pushed a bunch of the RTV out of the seam. How can I keep this from happening again?

[kwells]

tben,

have a looksie here
http://www.xz550.com/YICS.html

and here:
http://ridersofvision.net/forum/zindex.php?topic=7463.0

[tben]

thanks Kwells,

I've read both of those, my only problem is the Red RTV not bonding to the repair so it got spit out by the pressure. I was just wondering how to fix this. I think I'll try "The Right Stuff" that Permatex makes.

[Tiger]

 :) You have to make sure both sides are clean...use a solvent like brake and part's cleaner...apply Red RTV, put the two pieces together and clamp together, or, lay on a flat surface and put a book on top...Leave for 24 hour's in a warm area to cure before installing on the Vision.

             8).......TIGER....... 8)

[tben]

I used mineral spirits to clean it, not brake cleaner. maybe thats my problem. ???  Other than that I did just what you wrote.

[kwells]

mineral spirits will actually ADD oil

[Rick G]

I use RTV for very little. In engines its a liability . As far as the Yiks box is concerned, I use no gasket , I did on the  first couple , but decieded it wasen't necessary . I get them smooth on a piece of sandpaper, taped to piece of plate glass or masionite. sanding them in a figure 8  pattern. When I'm satisfied with the fit of the two halves togeather, I apply a thin coat of Yamabond / Hondabond / 3 bond , your choice there all the same . Reassemble the box and allow to dry over night.
Mine's been together for 5 years and has caused no trouble.

[jasonm.]

Yes YAMABOND 4. never heard of #3. Or use JB- qwik weld. Either way the box held together with the stock screws to help things seal.

[Rick G]

Jason , I wasn't refering to Yamabond as # 3 I was refering to 3bond brand of  sealer . I've heard that 3bond makes the stuff for Honda and Yamaha.

[h2olawyer]

Threebond 1104 is all I've ever been able to locate around here.  Honda & Yamaha dealers here don't carry their #4 product in stock, but can order it.  (If the EPA hasn't made them stop production / import yet).

H₂O

[Glyn]

Or you could use that time to fabricate a metal YICS chamber, like many have done on the site. No future cracking problems.

[tben]

Wouldn't that be nice, but it takes tools I don't have access to and skills I've never learned. ::)

[YellowJacket!]

Speaking of YICS Fix, Lucky, your YICS is now sealed up tight.  ;D

David

[h2olawyer]

I've got 5 years & 10,000 miles on my repaired one (so far)!  If you really take your time to do it right, the repair should last a good, long time.

H₂O

[Rick G]

I repaired mine in 2002 or 03  and its never given any further problem.

[Cdnlouie]

I prefer to coat both halves (properly cleaned and squared off with sandpaper so surfaces mate well) with J.B. weld and then forget about it forever.  I have 20,000 kms. and 7 years on this repair, rock solid.  There is no need to ever want to take them apart again.  Coat the JB weld down into the inside with a light layer and then on the outside as well, smoothing it all off like the original (insurance).

Keep it as simple as possible and you improve your odds of success,

:( Please note: I may have spoken too soon.  Aug 08 discovered JB epoxy has burned through  :-X.  At least as good as the original, but not good enough!  So I would recommend one of the other techniques, this time I went to the gasket.

[inanecathode]

If you're using permatex, let it cure a long long time. It wont be squeezed out if it's cured. If its not it'll flow all over.

[tben]

Funny this should be brought up today cause I was just about to do it myself. I have twice used permatex, Red then Black. Both times sanding very carefully and this last time cleaning everything with brake fluid. Both times my seal has failed between the chambers after about 30 min of running.
I want this to work! For both of those runnings the bike ran better than it did with the connections just plugged of at the engine.

Cdnlouie: JB weld is my next bet. Thanks for the tip

Inane: I let it cure for over 24 hours in my house at 70ish degrees. Could it possibly need more than that?

[inanecathode]

That should be enough.
The reason it failed the second time is because you used brake fluid :P brake fluid is glycol = oil. Use brake kleen, xylene should fix you up good.

[tben]

 ;D ;D ;D ;D. you caught my typo. I meant Brake Cleaner that sprays from a can and evaporates almost immediately. I may be new to this but I'm not that new. ;)