Flywheel Weights for CR125

Discussion in 'Honda' started by KRN15151, Jan 24, 2003.

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Should I get Flywheel a Flywheel weight for my 2001 Honda Cr125?

  1. Yes get a 7oz.

    4 vote(s)
    36.4%
  2. Yes get a 9oz.

    3 vote(s)
    27.3%
  3. No!!!

    4 vote(s)
    36.4%
  1. KRN15151

    KRN15151 C level Member
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    Will a 2001 Honda CR125R benefit from having a flywheel weight. Also what would be better for tight harescramble races a 7oz. or a 9oz. It seems to me as if you don't have lots of torque to begin with then you will not benefit from a flywheel wieght.

    Thanks,
    Kyle
     
  2. Terry22

    Terry22 C level Member

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    If your in a tite spot and have the op. to pass you will want to have that power there fromthe 7oz. but If that isn't your style I would stay the same until you could use you bike to its fullest now.
     
  3. KRN15151

    KRN15151 C level Member
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    I just want more bottom end and tracition and was wondering if the flywheel weight would help out.
     
  4. Terry22

    Terry22 C level Member

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    I came to this same problem a while back. I had it all figured out on how I was gonna make my bike as bad as possible, but then I was like wait a sec. I only weigh 135ilb so how will I get all that power to the ground? Its a lot on how you position your weight say for instants on a Super Late Modle dirt track car you have 6-7 shocls to throw weight around and be able to put 800 ponys on the ground without spining. On a bike you have one and neirly no weight to through around. So have your suspension set up for your weight and hight. Get that a fiddle around w/ diffrent size sporkets also. And if all else fails hold it wfo and you will quit spining after a while..lol.
     
  5. KRN15151

    KRN15151 C level Member
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    I can control the spinnig and I can transfer my weight all I want to know is if the flywheel weights help bottom end power.
     
  6. Terry22

    Terry22 C level Member

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    YEAH IT WILL HELP.
     
  7. Dan105

    Dan105 C level Member

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    A flywheel weight will only help bottom end power if there is already bottom end power there. If you have a 125 motor that is set up for top end a weight wont do anything but screw the powerband up. I have a 9 oz on my 01 cr250 and like it. I ride in the nastest stuff you can imagine. I used to run a 14 but realized it was hurting me in certain instances where i needed the wheelspin, so i like the lesser weight. I think 7 would be more than enough, just make sure you dont have any type of rev pipe on the bike. Idealy you want any mod to go along and agree with anything else you change on your bike. Im not the best at explaining things but what i say is fact about needs grunt to use the weight to its potential
     
  8. KRN15151

    KRN15151 C level Member
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    Ok thanks Dan that answers my question.

    Thanks a lot,
    Kyle
     
  9. MTRHEAD

    MTRHEAD C level Member

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    Somthing you make consider as a dual fix, is too install steel clutch plates instead of a FWW. You'll get a more durable clutch, longer lasting greabox oil AND added FW effect all for less than the cost of a FWW.

    It's obvious, from all your other post too, you are loking at things to give your CR bottom end and make it more rideable. The reed spacer may help, as will a few other things. Boyesens standard dual stage reeds are a cheap way to possible get some too. If your handy around the shop you could also lop about an inch or two off your silencer and make sure the packings in good shape.

    Moving up the dollar scale. The Power Now carb inserts also snap up the bottom end. The Bill's pipe worked pretty good on some of the other CR125's to boost bottom too.

    From there, you could have the cylinder ported from more low to mid. Eric Gorr does this pretty cheap.
     
  10. KRN15151

    KRN15151 C level Member
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    MTRHEAD thanks for all your help. I bought the Moose reed spacer from Dennis Kirk like you said but again i have another question where do i buy the Power Now carb insert. I also have a shorty silencer and a FMF Fatty but it really didn't help much.

    Thanks,
    Kyle
     
  11. MTRHEAD

    MTRHEAD C level Member

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    Those are just some basic ideas and inexpenxive things that TEND to give more bottom. I'm not saying they WILL give you more bottom. I've gone through 4 pipes, three reed valves and a bunch of other stuff on my 250 trying to get power I want and I'm runing the stock pipe right now. I liked it with a short silencer the best so far. You just have to test some different combonations to see what effects they have. I'm just offering up some ideas for you.

    A Power Now insert goes on the rear of the carb.

    Your best bet would be to have the cylinder done.
     
  12. KRN15151

    KRN15151 C level Member
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    I am running out of money though. I was going to get Eric to do a big bore and porting on my bike but it first of all is going to take to long and I don't have the money. If he did my engine then I couldn't race the first race in my series. Oh yeah where do you get the power now carb inserts.

    Thanks again,
    Kyle
     
  13. MTRHEAD

    MTRHEAD C level Member

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    www.worldpowerracing.com for the inserts, but I just looked and they don't have one for the '01 CR. Sorry.

    If you could just swing the porting without the big bore then you might be money ahead.
     
    Last edited by a moderator: Jan 26, 2003
  14. KRN15151

    KRN15151 C level Member
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    I can't get the porting now either becuase again I don't have the money. I spent all my christmas money and I don't have a job but need one. I am only 15.

    Thanks Again MTRHEAD,
    Kyle
     
  15. MTRHEAD

    MTRHEAD C level Member

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    I see. Well, there's the steel clutch plates. They run about $35. Again, you get FW effect for a lot less money than a FWW.

    Have you tried the stock pipe with the shorty vs. the fatty pipe?

    How about gearing? Tried adding a few teeth to the rear?

    I guess you could send me your cylinder and head and I could cut about .020" off the base and raise the squish .020" too. That should shift the power down the scale some.
     
  16. MTRHEAD

    MTRHEAD C level Member

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    To answer your e-mail Kyle, ( I can't answer by e-mail right now ) cutting .020" from the base will typically shift the whole powerband down. It won't fix too much blow time. I'd have to move the transfers up also to do that, but I was going to cut your base and head for free. It's just something I could do in a short period of time and if you don't like it all you have to do is add another base gasket, shave .020" off the head gasket surface and your back where you were.
     
  17. MTRHEAD

    MTRHEAD C level Member

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    Here's something else I just thought of. Call COMETIC gaskets and see if they have a fiber head gasket about .030" and a .010" base gasket.

    If I remember right the stock gaskets are .015" on the head and .024" base.

    That would lower the cylinder .014" and raise the head to keep your compression stock and do about the same thing as cutting the base.
     
  18. Ralph Wiggum

    Ralph Wiggum C level Member

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    You are looking to make something the bike isnt.Buy a TTR
     
  19. MN RMer

    MN RMer C level Member

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    One thing to remember, is that the steel clutch plates result in increased FW effect only when the clutch is engaged. What this means, is that if you're trying to ease into the power from a near dead stop with some clutching, your engine is not going to be less prone to stopping. ie- if you want FWW w/ the steel plates, the clutch must be engaged.

    As to the bolt on Steahly FWW... My son ran those on his 01 and 02 RM125's, with great results. The engine is more tractable, easier starting, and made better low end power. All while not hurting the top end at all. Think of the FWW like this- at low revs, your engine isn't really running (for example) 5000 at a steady rate. Rather, it is going thru a slow down and speed up every revolution. (due to compression and combustions) The FWW will reduce the differences between these two portions of the revolutions.

    Good luck with it. A 125 in the woods can be a lot of fun if you can hang onto it.
     
  20. Hurricane

    Hurricane B level Member

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    I hit new posts and this popped up............2003??
     

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