About 3 weeks ago my chain de-railed. It didn’t seem like my chain was too loose. Then a few days ago I was about to go for a ride and noticed my frame was broken. I pulled my swingarm and found major cracks. Apparently the chain de-rail is a sign of a cracked swingarm. Both my frame and swingarm are trash and I haven’t had any major crashes.
Surron Ultra Bee Broken Frame and Swingarm
- Thread starter Yz450f
- Start date
It’s all aluminum. I said that it was “cast” in the video. Actually it is die-cast. That is where aluminum is cast under pressure in a die (form). And to answer your question. It is weldable. I have a TIG welder that will weld aluminum. I’m still debating repairing it.
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- 4,445
- Location
- Lake Havasu City, AZ
Sorry, @Yz450f, it hurts to see bikes break like this.
Whether the frames or swing arms are boxed or not boxed determines flex characteristics, not the maximum strength. You just need to make the aluminum thick enough. KTMs use die-cast open lattice, or open-grid, aluminum swing arms on their street and heavy adventure bikes with no issues.
I had to re-weld my 1995 CR-250 swing arm welds on both sides three times after they cracked one after another. This was back in the 90's. Once plenty of extra aluminum was added, the welds didn't break again. Those were welds though... You can re-weld and reinforce your swing arm, but for the frame, you'd need to add gussets and reinforcements.
If you are planning to re-weld the frame and the swing arm, more power to you. If not, here are some project ideas that I just saw today
Whether the frames or swing arms are boxed or not boxed determines flex characteristics, not the maximum strength. You just need to make the aluminum thick enough. KTMs use die-cast open lattice, or open-grid, aluminum swing arms on their street and heavy adventure bikes with no issues.
I had to re-weld my 1995 CR-250 swing arm welds on both sides three times after they cracked one after another. This was back in the 90's. Once plenty of extra aluminum was added, the welds didn't break again. Those were welds though... You can re-weld and reinforce your swing arm, but for the frame, you'd need to add gussets and reinforcements.
If you are planning to re-weld the frame and the swing arm, more power to you. If not, here are some project ideas that I just saw today
Thanks, I’ve owned many Yamaha and Honda dirt bikes. A couple Kawasakis and a Husqvarna dirtbike. I’ve broken bones, my back, wheels, and numerous engines, but I’ve never broken a frame or swingarm. I’m in my 50’s now and his bike has not seen anywhere near the abuse that I was once capable of dishing out. I’m shocked that this bike is only a couple years old and breaking up.Sorry, @Yz450f, it hurts to see bikes break like this.
Whether the frames or swing arms are boxed or not boxed determines flex characteristics, not the maximum strength. You just need to make the aluminum thick enough. KTMs use die-cast open lattice, or open-grid, aluminum swing arms on their street and heavy adventure bikes with no issues.
I had to re-weld my 1995 CR-250 swing arm welds on both sides three times after they cracked one after another. This was back in the 90's. Once plenty of extra aluminum was added, the welds didn't break again. Those were welds though... You can re-weld and reinforce your swing arm, but for the frame, you'd need to add gussets and reinforcements.
If you are planning to re-weld the frame and the swing arm, more power to you. If not, here are some project ideas that I just saw today