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  1. Cr250r

    Thermal Barrier

    I must apologize in advance for the flaky way this question is worded, I cant think of a different way to put it ! I need a thermal Barrier between a cylinder head and a bearing block. In order to stop the heat transfer from the exhaust into the Plain bearing. Basically 2 blocks of aluminum...
  2. Cr250r

    Exhaust valve thermal gradient

    Thanks , whats about the gradient as we travel up the stem ? Sodium is fine Its very difficult to find such info on the internet, I would have though this one would have been easy to find !!!! Thanks very valuable post Kind Regards Stephen
  3. Cr250r

    Exhaust valve thermal gradient

    Hi all I was wondering if anyone could help , I need the average temperature gradient (in an Air cooled gasoline Engine) of the Exhaust valve Hope some one can steer me onto the right path Kind regards Stephen
  4. Cr250r

    coming out of corners

    Gosh turn you back for a while !! My local track is tight and twisty, so I need a bike that turns in easily and then when I open the gas ,,it to dig in and go! My aim was to lower the centre of gravity, by fitting an 18 inch rim to the rear and a 19 to the front, then set up the shim stacks so...
  5. Cr250r

    coming out of corners

    Hi all just like to throw this subject open Would like to brainstorm the following , Turnability and Driveability i.e turning into the corner and getting drive on the exit its a MX I am thinking about , but the concepts should apply to all PS ANY Idea is a good one ! Stephen
  6. Cr250r

    Dry Clutches for Motorcycles

    When I was at the Mc show I had a look at the new 06 bikes and the clutch was a one finger pull. I could pull it in easy with one finger ( I assume it had clutch springs fitted !) My bike is a 91 Cr with Highly modded everything ! I have been trying to find out the difference between the 06...
  7. Cr250r

    Dry Clutches for Motorcycles

    Hi there I race a CR250 and use Atf for the gearbox, ( not the F/mod one of course !) Its good for ONE ,,MAX two races and gives a nice(r) clutch feeling , The 06 /07 bikes have a lighter clutch ( unless the display model didnt have any internals!!!~) I am in the middle of modding my bike...
  8. Cr250r

    re coloring plastic

    Thanks all Yes thats what has happened , I can scrape a white powdery substance off, underneath the plastic sometimes is almost white ... the trouble is they are scratch free, a waste really Kind regards for all your help Stephen
  9. Cr250r

    re coloring plastic

    Hi there First let me introduce myself I am involved with a particular make of Motorcycle. The plastic of which tends to fade conciderable. The thing is over the years of racing , etc I have a large assortment of plastic radiator shrouds, race plates side panels etc. A lot of in...

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