I've done fourstroke 450 CRF engine casing repairs in the past and used magnesium filler rods and didn't have any problems, however I have attempted to weld much older casings(red rocket CR250) and found to be very porous castings which harbour contamination. Cleanliness is the key, try the ali rods with 5% magnesium content, then you might have some success. Im currently converting a 1981 maico 490 barrel to reedvalve, but having problems with machine set up after 15years away from welding.Its a honda 480 Rocket 5 speed 1983 motocross bike , I think thats right , ive ali welded loads of casings but this one is light and brittle it cracked as soon as it started cooling , grinding down the weld , found lots of porosity like an aero !
Ive ordered some rods from supplier (ouch) it hurt me but if it works its worth it !
I shall pm Brad now for some tips
How many rods did you getIve ordered some rods from supplier (ouch) it hurt me but if it works its worth it !
I shall pm Brad now for some tips
Ive ordered some rods from supplier (ouch) it hurt me but if it works its worth it !
I shall pm Brad now for some tips
12 rods. £66+vat I've gone all hot and sweaty again !
That’s cheap mate. Last time I looked I remember 10 rods being about £75.12 rods. £66+vat I've gone all hot and sweaty again !
I'm not keen on fillers and glue but thanks for the shout !
I don’t like the idea of that stuff either.No fillers or glue involved. Both are two-part products which when mixed set rock solid and can be drilled, tapped, ground, sanded etc.
I see you've sent off for the appropriate rods , but worth keeping these mind for future suitable jobs?
If you’ve got the equipment and ability to carry out a weld I’d rather do that than stick it together with paste.
They have there uses though. Have a pot of belzona here ready to undertake repairs to my mill table. Wouldn't want to go anywhere near it with a rod. Drill holes not cracks mind.I don’t like the idea of that stuff either.
It doesn’t replace a weld because it doesn’t penetrate into the joining surfaces. If you’ve got the equipment and ability to carry out a weld I’d rather do that than stick it together with paste.
It’s only gonna fill the holes though. It won’t actually do anything beneficial to the table itself and then you’ve got to sort it back out to flatness tolerances. I doubt it will colour match so it will probably look like a leopard spotted table when done. I wouldn’t weld it either I’d just leave it be.They have there uses though. Have a pot of belzona here ready to undertake repairs to my mill table. Wouldn't want to go anywhere near it with a rod. Drill holes not cracks mind.
It’s only gonna fill the holes though. It won’t actually do anything beneficial to the table itself and then you’ve got to sort it back out to flatness tolerances. I doubt it will colour match so it will probably look like a leopard spotted table when done. I wouldn’t weld it either I’d just leave it be.