RC20 wrote: ↑Sat Sep 28, 2019 9:09 pm
I have ramped her up to 75 with a fairly good load (cT) and no issues. I figure the 83 Heidel saw is about max, at a guess 85-88 the drag curve overcome what torque and hp you have left up there. I was happy to stay under 60 early on, got used to the Ural and now 75 is fine. Prefer 60 still just because its not as intense.
I too found out what 3rd was good for in the Mountains (though the road is more hilly) coming into Anchorage. Nasty narrow spot in a pass and the headwinds can be brutal (and were). I wound up living in 3rd for 15 miles. No place to pull out safely (narrow old road) so keeping up with traffic was the goal.
I didn't have the tach working at the time but ran it up around 60 a few times and it felt fine. That is 5750 which looks to be in the Yellow range if they still used colors on tachs.
I worked with big diesels for a long time. The most interesting area was marine use ( or if you look at industrial vs auto its amazing how hopped up the Cummins (because they serve all areas) are. That same engine as a pump engine would be half of what they list vehicle.
Marine use is very specific. They may allow you to run 1000 hp, but only 25% of the time. Full time max allowed would be like 600. They would have a over 50% raging of say 800. These day with the electronics they would be able to see it. Ural engine seems like that. 6200 rpm if you need it but keep it down 5000 for the most part.
The steady in the Manual unloaded is listed as 70 mph unloaded and that is 4950.
That would accommodate hot weather and cooler you might get away with more.
So while you can hit the rev limiter do it only if you need to, use the upper end when and if you need it and generally keep it around 5k steady and you will have a long engine life (and interesting to see how the piston band works out long term)
And I think we still do not have updated info on hp and torque and what the piston band may or may not allow as far as higher speed ops.
IMWA does not recommend or endorse any "redline" rpm. They recommend and endorse the speed, and load limitations stated in the owners manual.
The rpm on the data tag is the limit of the exhaust and noise emission rating, nothing else. There is a rev limiter to prevent damage from excessive rpm.
This is whats officially recommended.
" Rider, no passenger or payload: 65-70 mph.
Rider and passenger, no payload: 60-65 mph.
Rider, Passenger and payload up to max GVW 50-60 mph.
Ural recommends a maximum speed of 70 mph. - The recommended max speed is not
intended to be maintained for long periods of time. Reduce maintained max speed
accordingly as temperatures rise throughout the day and/or if you will be traveling long
distances with additional payload.
Reduce max speed for heavy payloads and as ambient temperatures rise.
Allow the motor to cool at fill-ups, take a break before resuming on a long trip.
Give your Ural 20 minutes to cool for every 2 hours.
Long Distance - Ural motorcycles are very capable of long distances if routine
maintenance, rate of speed and the load are adjusted accordingly based on the
conditions.
If traveling in warm temperatures, reduce speed and/or make periodic
cooldown stops.
Make it a habit on longer trips to check oil at fill-ups and cooldown/rest stops.
High temperatures and sustained speed can lead to higher level of oil
consumption."
Anything else is just personal opinion at ones own risk.
