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Cruising Revs

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  • July 6, 2011 at 11:05 pm #100152

    Steve Sparkes
    Member

    I have a 2002 xr250y.
    I have a number of different front and rear sprockets which I am trying out.
    Can anybody suggest the maximum sustainable revs I should pull for a cruising speed?

    July 6, 2011 at 11:18 pm #204513

    glenn
    Member
    riverright wrote:
    I have a 2002 xr250y.
    I have a number of different front and rear sprockets which I am trying out.
    Can anybody suggest the maximum sustainable revs I should pull for a cruising speed?

    is that cruising single trails,fire trails or full on adv cruising?????

    July 6, 2011 at 11:25 pm #204514

    Steve Sparkes
    Member

    How does that relate to sustainable revs?

    Essentially I suppose I’m talking full on adv cruising, although I dont tend to do a lot of that.

    July 6, 2011 at 11:32 pm #204515

    Chris
    Member

    Mate have a look here. http://www.gearingcommander.com/ should tell you all you wanted to know.

    July 6, 2011 at 11:52 pm #204516

    Steve Sparkes
    Member

    Krusty,
    that is an awesome site, thank you very much.
    But I still dont see how it tells me what revs I can sustain without cooking the motor.
    It tells me what speed I attain at 8000rpm, but doesnt tell me whether I can sit on 8k.

    July 6, 2011 at 11:55 pm #204527

    Greg
    Member

    Boony what has it got to with it :P You would be surprised the amount of transport you do when you race the A4DE.

    I reckon every bike is different even if it’s the same bike (does that make sense model etc I mean) engines have a sweet spot it will love to sit on and that won’t be gearing related it is all engine and you gear the bike around that sweet spot the engine has.

    Take your bike out cruise around and you will fit a spot the engine likes to cruise and does it easy. Just my thoughts, see you can over gear it ( easy with a little 250 ) throw sprockets at it and find it won’t pull it, is always lugging sucking fuel. Whatever gearing you are running go one tooth bigger on the front and see how it goes, the chain shouldn’t need lengthening and it’s a cheap way to try it out

    TB

    July 6, 2011 at 11:57 pm #204528

    Mick D
    Member
    riverright wrote:
    Krusty,
    that is an awesome site, thank you very much.
    But I still dont see how it tells me what revs I can sustain without cooking the motor.
    It tells me what speed I attain at 8000rpm, but doesnt tell me whether I can sit on 8k.

    Your bike and common sense should tell you that. If it is revving its tits off at 8000 rpm , back of a little..:laugh:

    July 7, 2011 at 12:08 am #204517

    Steve Sparkes
    Member

    This is the first 4 stroke I’ve owned, so I dont always understand what the bike is telling me.
    All the gearing I’m doing is higher (more tractor like) than stock.
    Perhaps I’m not over endowed with common sense.
    Would you sit on 7k on an xr250? How about 8k?

    July 7, 2011 at 12:32 am #204529

    Mick D
    Member
    riverright wrote:
    This is the first 4 stroke I’ve owned, so I dont always understand what the bike is telling me.
    All the gearing I’m doing is higher (more tractor like) than stock.
    Perhaps I’m not over endowed with common sense.
    ?

    Sorry Riverright, I wasn’t trying to be funny. You are gunna loose some top speed going for the tractor effect, although XR’s love being a tractor. The bike will tell you that it is revving too hard. If you get to 7500 rpm and it stops pulling, that is the maximum revs it should be doing.

    July 7, 2011 at 12:43 am #204518

    Steve Sparkes
    Member

    So for example lets say 7500 is where it stops pulling.
    Is it OK to sit on 7400 for a LONG transport section?

    July 7, 2011 at 12:45 am #204534

    Mick D
    Member
    riverright wrote:
    So for example lets say 7500 is where it stops pulling.
    Is it OK to sit on 7400 for a LONG transport section?

    As a scenario that is a good one. ;) The more you ride the bike the easier it will be to find its sweet spot.

    July 7, 2011 at 12:57 am #204519

    Steve Sparkes
    Member

    I think I understand now – its subjective.

    The reason I’m concerned is that some of the 2 strokes I’ve ridden seem to get sweeter and sweeter the more revs are piled on.
    However that is not a situation that could be sustained as the motor would cook.

    If I sought a dyno chart for my model, do you think that would help?

    July 7, 2011 at 12:59 am #204535

    dennis da menace
    Member

    im yet to find an XR with a sweet spot 😆 😆

    July 7, 2011 at 1:00 am #204536

    Greg
    Member

    I would have thought around 5000rpm max for extended periods. A XR 250 max revs are 8500 thats red line 5 or 6 for cruising you wouldnt drive you car down the road at 5500 if it red lined at 6500 would you

    TB

    July 7, 2011 at 1:07 am #204520

    Steve Sparkes
    Member

    Thanks TB, thats the sort of advice I’m after.

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