Discussion in 'Other Norton Motorcycles' started by jseng1, Apr 22, 2019.
Here's a short vid of a customer with a 920 featherbed. Seem to be very free revving for a 920
Can't get the video to run.
It comes up that the video has been removed by the user, would have been interesting to see.
This is new link:
The power measurement is now done, taking a little fine tuning to find out the final result.
Big thanks to Jim & Steve for the good parts and special thanks to Jim for advice.
Sorry but I can't attach a photo from a mobile phone, but could anyone give advice?
Here's Wade's Monster 920cc feather bed and 90 HP dyno chart.
Congratulations, not only beautiful but seriously powerful and in a great handling chassis. Edit - Love that torque curve.
Can you feel my envy?
Than you guys.
Yeah, the combination of flat torque and linear power curves should make that an easy bike to ride fast for sure!
Interesting how the power flattens off at 6,000rpm, my 850 did the same.
What are the internal specs?
You got any build pics to share??
Here are some pictures.
Thanks for sharing.
Really nice work.
Sorry matey but I gotta ask more !
What cam are you using?
Did you measure the compression ratio, if so what is it?
How difficult is it to kick over?
Is that a stage 2, or stage 3 Maney head?
What are the carbs? And what size.
What ignition are you running?
That’s all for now !
What forks/yokes are you using? Do you know the offset to the yokes?
My Triton has a similar set up (lower offset yokes, 18" wheels, longer swingarm) and I'm quite fond of the handling, but wondering if you've ridden yours around much yet and what you think.
That motor would get me into trouble! Lovely.
I don't know what the camshaft is, but it has a lot of overlap in small degrees.
The compression ratio is 10.63
It starts well, but a bit of heat is a bit difficult.
The cylinder head is stage3, but there is a slight change.
Carburetors are the Mikuni accelerator pump 38mm carburettors.
The ignition is HPI.
All parts of the cover and others are lightened.
Yokes has been made by a friend.
Offset is 37mm
I've been satisfied ... The steering is accurate and fast. I like it.
Sounds brilliant. Bet it’s an absolute blast to ride !
And of course Jims long rods and coated pistons.
A torque of 110 Nm (81 ft-lb) at the crankshaft is quite an achievement. You almost got rid of the pronounced dip at 3500 rpm seen with the regular 850 as well.
However, the engine is in a high state of tuning. How long will it hold up in a street bike? I would be particularly worried about the crankshaft and if you are using a bolt-up crank,
I suggest you order a billet crankshaft the sooner the better.