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Thread: FXR race cams

  1. #1
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    FXR race cams

    Anyone got any specs on race cams for a MotoFXR? Can I just get the standard cams reground?

  2. #2
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    Quote Originally Posted by gav View Post
    Anyone got any specs on a race cam for a MotoFXR? Can I just get the standard cam reground?

    AFAIK you can't run hot cams in buckets can you?

  3. #3
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    Read the far kin rules, geez.

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    Quote Originally Posted by skidMark View Post
    AFAIK you can't run hot cams in buckets can you?
    Clearly, once again you have proved that you know fark all ......
    Not allowed in two strokes .... see page 17

  5. #5
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    Oh and specs on a race pipe too, would be handy, thanks.
    And, errrr, your input won't be required Mark, so please run along .....

  6. #6
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    Basically you can do whatever you want with F4 four strokes, the basic limitations are.

    Naturally aspirated, ie. no turbos or superchargers (Ram air is OK)
    Must be running on petrol, Av-gas is OK but no meth or Nos
    Engine must have started life as a non-competition engine. that is trail bike OK, motorcross bike not... Street bike fine, GP bike not...... etc. Some of the Derby 2 strokes are on shakey ground with that rule as they come from the factory in dedicated race bikes etc, check out Metrokit.....

    Outside of that you can do pretty much whatever you damned well please which is half the fun of buckets as opposed to Street Stock 150s. The really fast bikes have spent plenty of time on home-made dynos working on compression ratios, exhausts, cams, cam timing, ignition timing, porting etc, etc, etc The sky is the limit if you've got the time and the money. Won't do you anygood at Mt Welly though cause it's all about the corners and power hasn't got a lot to do with it

    The reason that some of the CB125 twins go so well is that they've had 30 years to figure out what makes them go faster and stay together. The FXR's have a long way to go till they're in the same league.

    Don't take too much notice of some of the BS on this site, half the people on here haven't read the rules and have never touched their engine short of putting oversized carbs and exhausts on them which probably make them go slower.......

  7. #7
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    Quote Originally Posted by Sideways Sam View Post
    The sky is the limit if you've got the time and the money. Won't do you anygood at Mt Welly though cause it's all about the corners and power hasn't got a lot to do with it
    This I know to be true. but you can do pretty much tuning wise whatever you damned well please which for me is half the fun of buckets and the people you meet there are just the best!

    .

  8. #8
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    Quote Originally Posted by TZ350 View Post
    .



    This I know to be true. but you can do pretty much tuning wise whatever you damned well please which for me is half the fun of buckets and the people you meet there are just the best!

    .
    Here, Here. I agree totally

    There are some great people in buckets (some of them are very clever engineers too)

  9. #9
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    Quote Originally Posted by Sideways Sam View Post
    Basically you can do whatever you want with F4 four strokes, the basic limitations are.

    Naturally aspirated, ie. no turbos or superchargers (Ram air is OK)
    Must be running on petrol, Av-gas is OK but no meth or Nos
    Engine must have started life as a non-competition engine. that is trail bike OK, motorcross bike not... Street bike fine, GP bike not...... etc. Some of the Derby 2 strokes are on shakey ground with that rule as they come from the factory in dedicated race bikes etc, check out Metrokit.....

    Outside of that you can do pretty much whatever you damned well please which is half the fun of buckets as opposed to Street Stock 150s. The really fast bikes have spent plenty of time on home-made dynos working on compression ratios, exhausts, cams, cam timing, ignition timing, porting etc, etc, etc The sky is the limit if you've got the time and the money. Won't do you anygood at Mt Welly though cause it's all about the corners and power hasn't got a lot to do with it

    The reason that some of the CB125 twins go so well is that they've had 30 years to figure out what makes them go faster and stay together. The FXR's have a long way to go till they're in the same league.

    Don't take too much notice of some of the BS on this site, half the people on here haven't read the rules and have never touched their engine short of putting oversized carbs and exhausts on them which probably make them go slower.......
    Thanks for all that .....
    Kinda why I was hoping someone might share what they have found has worked, this is after all buckets, not MotoGP or WSBK. Maybe some sharing of info might be available?

  10. #10
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    I don't know much about the cams that FXR150 sell except that they are new race cams out of Malaysia (definitely not regrinds).

    When I can afford some for myself I will get them profiled so we know what we're dealing with.... Apparently they are longer duration but that's all I've been able to find out.

    There are probably cheaper/easier ways to get some extra HP out of an FXR but first you need to decide what sort of power curve you want which is dictated by the track......

  11. #11
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    Quote Originally Posted by gav View Post
    Anyone got any specs on race cams for a MotoFXR? Can I just get the standard cams reground?
    Yep you can regrind the standard cams. Talk to Kelford cams in CH CH. They are made from not bad steel so can be built up and reground.

  12. #12
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    Quote Originally Posted by Sideways Sam View Post
    Naturally aspirated, ie. no turbos or superchargers . . . . . . .

    Don't take too much notice of some of the BS on this site, half the people on here haven't read the rules
    Pot, kettle, black . . . . . . .

  13. #13
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    Quote Originally Posted by speedpro View Post
    Pot, kettle, black . . . . . . .
    Actually, we're talking about an FXR150 and as far as I can ascertian (and I've read the rulebook a couple of times) that's a no go. The rules state "All engines must be normally aspirated except F4 4 stroke engines of less than 100cc capacity, which may be turbo or supercharged."

    Last time I looked, the 150 in FXR150 stood for the capacity of the engine which is quite clearly well over the stated max of 100cc for blowers.

    In saying that, I've heard a lot of people talk about blowing 100cc engines and in theory you should be able to get some serious hp but never seen anybody do it with reliable success...... It would be fun if I had the time!!!

  14. #14
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    Quote Originally Posted by Sideways Sam View Post
    There are probably cheaper/easier ways to get some extra HP out of an FXR but first you need to decide what sort of power curve you want which is dictated by the track......
    We race on real tracks, not car parks
    What would you suggest, currently running GN250 carb, ported head, big bore exhaust.
    Have got 32mm Flat Slide carb coming.

  15. #15
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    Quote Originally Posted by gav View Post
    Have got 32mm Flat Slide carb coming.
    Saw a Gav biding on of those on trade me, would have bid on it myself if I had the money

    For the record Qkkid was in my bed, not the other way round

    Quote Originally Posted by Yow Ling View Post
    Pumba is a wise man.

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