Cruising Revs

[Steve SparkesMember]

I’m now thinking 6000rpm is quite sustainable, and I’m gonna test out a few hundred more.
Am I going too far?

[drewMember]

i would have thought 6000 maybe even a tad high.

what is it like at 2/3 throttle?

i would have thought that 2/3 throttle would have been a comfortable sustained speed.

but those that have /had XR 250 can guide you more accurately.

i would have thought 6000rpm more 2T territory.

does the XR have a tacho? my way of thinking would be what rpm is it at when pinned in top gear? and go somewhere between 1/2 to 2/3’s of that for prolonged constant rpm.

[Steve SparkesMember]

Yeah I’ve got a Trail Tech tachy.
2/3 of full throttle eh?
I’ll see how that works out.

My bike is geared up but TB reckons max is 8500.
Thats between 4250 and 5670 revs on the 1/2 to 2/3 principle.
Those figures seem reasonable.

6000 is within a sustainable margin of error, but perhaps no more eh!
And consistent with what youve all been saying.

[drewMember]

to be honest 2/3 of full throttle is more an educated guess sort of.

as i said, see what top gear and full throttle rpm is. then i’d be comfortable to hold it as 1/2 to 2/3 of full throttle for longer periods of time.

as TB said i’d lean more on the side of caution, most cars, trucks etc. are geared to cruise at 100km/h in top gear at approx. 1/4 of their redline. based on most 1990 onwards Falcons they mostly cruise at 100km/h at around the 1800rpm mark in top gear. but redline at 5500-6500.

utes with a lower ratio would be at around 2200-2800 rpm. making it quite safe to sustain 1000-1500 rpm higher than std. cruising rpm.

if the redline is for e.g. 6500 i’d be leaning more to being happy to run it for longer periods at say 4000 rpm. max. but i’m talking 30+ km … not just a few km of more open flowing fire frails

but one thing to keep in mind is if you intend to run the engine at double the normal cruise rpm you would be inclined to change the oil more frequently than the stated periods.

[Adam RodgersMember]

Riverright,

If you can cruise around your max torque you get the biggest bang for your buck.

On a XR250R thats @ 6700 rpm I don’t know if the “Y” was setup differently.

If your cruising around 6000rpm you should be fine.

It is a single cylinder 250 after all.

I know cars cruise at lower revs but they also have longer strokes and bigger bores.

My DRZ400 feels fine @ 6000 to 7000 rpm, although its redline is 10000 rpm.

Adam.

[Steve SparkesMember]

I think the idea is to not exceed 6000 for prolonged periods.
And if I do, then give it a break below 6000 for a while.

Thanks all for your help.
I’m running 12/44 atm btw.

[scott bockingMember]

6000 should be no problem mate. My WR250 stalls below that :laugh:
It did get asked earlier in the thread if your plan was to use your XR for ADV riding. Is that the case?

STM

[Steve SparkesMember]

Not exactly your majesty.
This setup is for the slow stuff.
But I want to build a versatile bike, and I’m prepared to change cogs for a more roadworthy gearing.
And I do aim to get a rack and build my own soft luggage (down the track a bit)

P.S.
Ive found the perfect solution actually. The main issue is heat.
I was browsing XR’s only and found a oil temperature gauge dip stick.
What a nifty little gadget. $40.00 to my door (eventually).
I ordered one. That will tell the story.

[Author]

Posts