What is your wonder glue?

Lacing it together before coating in epoxy resin is probably the strongest solution imho. I’ve done that in the past using fishing nylon, although epoxy resin might be too inflexible.
It’s always a gamble what glue or resin will stick because you probably can’t tell what type of plastic it is, how old, and how much it will be flexed in service. Try blobs of different types to see what works best. Sometimes humble RTV silicone is better than anything. For prep, fine sanding or scotchbriting followed by a solvent clean like meths has given me the best results in the past.
 
Are NOS or reproduction airboxes available? If the existing plastic is old and brittle it may end up cracking elsewhere after being repaired. Mine cracked about 33 years ago on the way to Canberra, when Lake George was full.

cheers

bazzee
 
I'd go with Cosi's solution. Glass fibre reinforced epoxy, with the fibre mesh applied to the inside where it won't be visible. Rough up the surface with coarse sandpaper before applying the glass/epoxy to ensure a good bond. Stick a captive washer on too if you want to. The epoxy will soak into the cracks in the airbox and stabilise them. Put masking tape on the outside so the epoxy wicking into the cracks doesn't make a mess on the outside or worse still, glue the whole thing to your workbench. A plasticine plug in the bolt hole might be a good idea too, although you can always drill it out again afterwards if it gets filled with epoxy.

I've used the glass/epoxy technique on Laverda side covers that are cracked and missing the grommet barbs. It works really well. It's very strong and I've never had one delaminate. I made new grommet barbs (plugs, pegs, projections, whatever you call them) by casting them in epoxy too, using a silicone mould taken from an intact one.
 

Another Newbie

So yesterday i finally got around to refitting the airbox on the Jota,not a big job in the scheme of things but an achievement nevertheless, and it took a little fettling to get there. Here's where it starts............................... looking battered and bruised and held together with...
laverdaforum.com laverdaforum.com

Here you go Jim for some inspiration :)
 
Schurminater said:

Another Newbie

So yesterday i finally got around to refitting the airbox on the Jota,not a big job in the scheme of things but an achievement nevertheless, and it took a little fettling to get there. Here's where it starts............................... looking battered and bruised and held together with...
laverdaforum.com laverdaforum.com

Here you go Jim for some inspiration :)
Click to expand...

Well now. Mine doesn't look so bad after all.

Now ...... if I only new what product "a strong solvent weld adhesive used for pipes and guttering" is ..... I'll be off to the races!

Jim
 
I tried a few solutions to the slipping Oxford Heated grip on my Throttle side but the only fix that worked was High Strength Aroldite, that's a 2 part epoxy. Contact would fail when they were heated same with superglue the latter is what Oxford include when you buy them. Having a loose slipping throttle is beyond frustrating on a multi-day ride.
 
helicopterjim said:
Well now. Mine doesn't look so bad after all.

Now ...... if I only new what product "a strong solvent weld adhesive used for pipes and guttering" is ..... I'll be off to the races!

Jim
Click to expand...
Do you have Home Depot or similar nearby? Find the irrigation plumbing aisle and look for the kit that has purple primer and clear adhesive for the white pipes and fittings.
 
Had this brittle box previous, high grade butyl Rubber ( external facade glass type high retention ) Dow had a good product, Sikkens is current, called "Super Snot" in the car body repair trade, adhesive for all manner of car plastic repair, HTH
 
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