Harry, keep going, your doin it right I see! Neat!!!
The intake I have is with an elbow bend is going to go to an air intake that is quite long, the intake I see you have has a bend like a 45 degrees, mine has a 90 degree bend.
I can try once I have it ready to run try with and without the long intake to a higher on the frame point corrugated hose to keep away from off roading dust. Then I can see if there is much difference.
If this gives additional low end torque, I'll be real happy for hill climbing. I only have an 8.3 to 1 ratio gearing down.
I saw Tavern posted a YouTube Link on this site MB about some British Old Time Motorcycles movies, or rather a side show with some nice music and great old time pics.
One motorcycle pic was with just like mine having a corrugated hose from the carb to up high by the gas tank. It looks to be in a desert, like a dry lake bed, and a bit dusty.
Seems the length is not so much an issue, but I think if too tight bends could be a problem, but not like I see with what you have done, should be OK.
From the Tavern on MB
http://motorbicycling.com/f28/very-cool-stuff-32306.html
I saw this listing of the youtube video.
gunnasmc's Channel - YouTube
This one 8min 31sec long and at time location 0:37 to 0:40 is the pic of the one I described above with an elephant truck snout corrugated hose to suck in clean …hopefully… air without dust in it.
Another shot was a motorcycle jumping over a moving locomotive steam engine going down the tracks at time 5:12
Measure Twice