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Thread: CR250 broken

  1. #1
    Join Date
    10th September 2007 - 14:31
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    2009 Honda CRF450 injected
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    CR250 broken

    So... took the bike out to Fells Farm winter series today, ran it for the 2 lap practice which seemed to run fine but was pinging a fair bit. I changed the gas out and put some fresh stuff in. Seemed fine for the first lap then into the 2nd it started to feel like it was pinging again bogging (almost like I was trying to ride round corners in 5th gear or something). I slowed down then it started to die.

    Bike seems like it has almost no compression when you try to kick it. Anyone had something similar happen to them?

    2005 CR250R 2T.

  2. #2
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    2nd August 2006 - 22:17
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    Quote Originally Posted by Pierce View Post
    So... took the bike out to Fells Farm winter series today, ran it for the 2 lap practice which seemed to run fine but was pinging a fair bit. I changed the gas out and put some fresh stuff in. Seemed fine for the first lap then into the 2nd it started to feel like it was pinging again bogging (almost like I was trying to ride round corners in 5th gear or something). I slowed down then it started to die.

    Bike seems like it has almost no compression when you try to kick it. Anyone had something similar happen to them?

    2005 CR250R 2T.
    yup years back my cr250 i had did same thing i had mixed gas wrong any way had no compression ripped head off turned out it had seized up ripped the bottom skirt off the sleeve and totally trashed the piston was a large pulpy pastey mess in the bottom of the crank.
    [SIGPIC][/SIG

  3. #3
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    25th January 2008 - 23:13
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    2011 YZ450F, 2010 RMZ250
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    Might be a silly question but is your air filter in there? Watched a guy's bike die a while back as he ran it without one on accident... Symptoms would be similar too, pinging due to running lean and no compression now due to burning a hole in the piston. Otherwise with lack of compression I can only suggest taking the top off for a looksee.

  4. #4
    Join Date
    17th July 2006 - 13:53
    Bike
    2006 CR250R
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    Gisborne
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    oh... doesnt sound good. pull it apart..

  5. #5
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    2nd October 2005 - 00:47
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    Yeah, did you run it with 2 stroke oil??

  6. #6
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    18th August 2008 - 20:41
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    is the cylinder head cracked maybe ?? Happend to me before

  7. #7
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    10th September 2007 - 14:31
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    Def put the right gas in as I mixed it up just before the race, filter was in there as I put in a fresh one before I left Auckland. So it sounds like it's gonna cost a bit :-s

  8. #8
    Join Date
    17th July 2006 - 13:53
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    sounds like its leaned out for one reason or another, best case scenareo, replace piston, rings, little end bearing- worst case scenareo, all the above plus a cylinder or sleeveing of.

    intake manifold leak perhaps? split intake boot? loose or not sealing reed block? unsealed casings... fuel mixture? partially blocked main jets? shit fuel...

    what plug and jets are u using?

  9. #9
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    10th September 2007 - 14:31
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    Quote Originally Posted by B0000M View Post
    sounds like its leaned out for one reason or another, best case scenareo, replace piston, rings, little end bearing- worst case scenareo, all the above plus a cylinder or sleeveing of.

    intake manifold leak perhaps? split intake boot? loose or not sealing reed block? unsealed casings... fuel mixture? partially blocked main jets? shit fuel...

    what plug and jets are u using?
    Bike is basically stock. plug is an BREG8 I believe.

  10. #10
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    17th July 2006 - 13:53
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    Quote Originally Posted by Pierce View Post
    Bike is basically stock. plug is an BREG8 I believe.
    as a comparison, i use BR9 plugs, and run a 430 main jet. i understand 420 is stock, both these mods equate to less detonation

  11. #11
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    17th August 2005 - 11:00
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    Quote Originally Posted by Pierce View Post
    Bike seems like it has almost no compression when you try to kick it. Anyone had something similar happen to them?
    That doesn't sound good when was the last time you did a piston or rings mate?
    I concur with B000M either air leak somewhere to cause it to lean out, simply past its use by date and its lost compression or something has gone in/come loose and knackered the engine. Sounds like it needs a strip down. Clean the carb well and inspect the things B000m suggested carefully.

    BTW: I ran a Br10 in my Cr some off the time so the move to a Br9 it wouldn't hurt at all.
    On a Motorcycle you're penetrating distance, right along with the machine!! In a car you're just a spectator, the windshields like a TV!!

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  12. #12
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    1st December 2008 - 08:56
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    Quote Originally Posted by barty5 View Post
    yup years back my cr250 i had did same thing i had mixed gas wrong any way had no compression ripped head off turned out it had seized up ripped the bottom skirt off the sleeve and totally trashed the piston was a large pulpy pastey mess in the bottom of the crank.
    Sounds like another rebuilds candidate for Friday night...?
    "Lean like a cholo, side to side"

    "Just get a GN250 and put offroad tyres on it"

  13. #13
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    17th July 2006 - 13:53
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    Quote Originally Posted by Sammikins View Post
    Sounds like another rebuilds candidate for Friday night...?
    how late do these friday nites go?

  14. #14
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    1st December 2008 - 08:56
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    Quote Originally Posted by B0000M View Post
    how late do these friday nites go?
    Till weneva really?
    "Lean like a cholo, side to side"

    "Just get a GN250 and put offroad tyres on it"

  15. #15
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    2nd August 2006 - 22:17
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    Quote Originally Posted by B0000M View Post
    how late do these friday nites go?
    depends on whats being built and who much piss there is, Worst was an all nighter bike finished round 11 drinking continued till we ran out and sort passed out lol
    [SIGPIC][/SIG

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