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Diaphram to slide reattatchment

chuck hahn

chuck hahn

Forum LongTimer
Past Site Supporter
What glues would be good candidates to reattatch this diaphram back to the slide?? I was thinking regular hardware store contact cement..yes, no, maybe????

 
I would guess somewhere between NO and MAYBE.

Is that normally a press-fit? I have never had a GS diaphragm come apart, but saw that with my son's Yamaha.
The assembly was a bit different on that one, so it required a different fix.

.
 
Cant say for sure if its a pressed fit or the ends of the plastic posts were melted to peen them over like rivet at one point.
 
I also was thinkingb to scuff each surface to make a bit of checking for an adhesive to grab ahold of..
 
What you don't want is something that will eat or deteriorate the coating on the diaphragm. I really cant say what as I've never attempted said fix. What size is it for? I may have one in the many spares I have laying about.
 
No glue. The diaphragm is held by the plastic piece. How did you take it apart?
 
Nessism said:
No glue. The diaphragm is held by the plastic piece. How did you take it apart?
Click to expand...

I don't think he did. I think it was like that when he opened up the carb. I've seen it one time. And have no idea A) how it came to be that way or B) how one or what one would go about using to fix it....
 
Josh is correct..like that when I opened them. They are BS34 flatsides from a GSXR1100. The PO tried to reapply it with what looked like black RTV but it didnt hold. I was lucky enough to take a rag and some carb spray and remove all the RTV from both pieces. Now the thing is to discover how to reattatch. I have thought about this all night at work.
Those two posts that pass thru the holes in the slide are what I think is ABS plastic..so i was thinking maybe a dab of ABS glue on the ends once thay are reinserted into the slide. leave it kinda beaded at the ends of the posts... What do you guys think of that idea?
 
Took another slide out and looked at it under a magnifying glass. It appears that the original posts stuck thru the holes a bit and some kind of hot press riveting was made by mushrooming the excess that sticks thru. So the bead made by the heat pressing must get brittle after time and start chipping away and eventually releases from the slides. So basically I need to duplicate this. Heres as good a picture i could get of the heat pressed fitment.


 
Should work actually.
Another thing you'll want to check is the slide itself, as well as the plastic guides in the throat. A lot of guys say those carbs were "cheaped out" on by Mikuni and the plastic bit wear horribly... I think posplayr did a write up on rebuilding the tracks with aluminum sheet instead or something to that end.
 
Use a flat soldering iron tip to mushroom out the pins. Should take about 1 minute and no cure time. Just make sure the plastic has cooled totally before you "test" it.
 
Hillsy...thats the problem..the pins no longer extend past the face of the slideand theres nothing left to mushroom again.
 
Hers my decided on fix..First I drilled a small hole down the centers of each post. Then mixed up some epoxy and squished it into one end of the hole until it came out the other. Then i reset the slide to the diaphram and added a dab of epoxy on each side of the holes I had drilled thru. Now what I have created in effect is an "epoxy rivet" that runs down the center of the post..Just hope its strong enough to not release again...




 
Edit: Chucks post above came in while I was typing.

What about drilling into those two pins with a small bit, then using sheet metal screws slightly larger than the hole to flare out the pin and lock the slide together?

BTW Chuck, your photo links SUCK!!! Pop-up box city when trying to view your photos.
 
Last edited:
The screws will provide a mechanical lock, better than adhesive alone.
 
well I can still redrill and add a small screw . Will have to run to the hardware and see how small I can find.
 
Ed..Do you think the weight of two screws would be an issue as far as slide function as compared to the 3 other unbroken ones?????
 
chuck hahn said:
Ed..Do you think the weight of two screws would be an issue as far as slide function as compared to the 3 other unbroken ones?????
Click to expand...

No problem with a small bit of weight chuck. Use small screws.

Would be best to do this before the glue drys. The idea is to flare the plastic post out a smig to swedge it against the hole in the diaphragm.
 
On my DRZ350S, it snaps on to the slide holder and is a separate replaceable part. Wish they were all like that.
 
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