Discussion in 'Norton Commando Motorcycles (Classic)' started by olympus, Mar 10, 2018.
I intend to do this frame "upgrade" ie the crosspiece welded in between downtubes.In Europe (HNW) its referred to as a "Thruxton" modification.Any idea on how far down
its welded in guys?
No set place but 1/2 way between the bottom of headstock and the front iso tabs would be both effective and easy on the eye.
Ken do you know what that little extra cross tube is supposed to do? What forces it’s acting against or failures it protecting against?
Flex and splaying of the front down tubes, especially under hard braking. Look at pics of the Dreer 880s and he did this mod as well. When I did my recent resto I made this mod.
Sorry for the delay in answering. I've been without internet access for a few days because of the local fires. Anyhow, the answer is pretty much what gortnipper said. It was a fairly common mod for race Commandos back in the '70s, and I copied the idea from someone else back then.
Hope you and yours are all safe ?
I like the idea of the front down tube cross brace and the valve spring underneath to help out the isolastic rubber mounts in keeping everything lined up where it is supposed to be, while still allowing for freedom of movement..... P. S. Are the California wild fires headed your way Ken? I sure hope not, take care though, Cj
One of the fires started 2 miles from my house, and I had a good view of the flames from my front porch. We were on evacuation watch for a while, but fortunately the wind blew the fire almost directly away from us toward the coast. The fires are still growing, but not in our direction. I think we will be fine, but we have the motor home ready to leave, just in case. It is a bit distracting, though
Master of understatement Ken...!
Yeah, my cousin's house had their yard burn, and their windows explode and the side of the house charred. But it was saved. Not great, but could be a lot worse.
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