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Thread: My Topend rebuild

  1. #1
    apriliaforum prov-nov
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    My Topend rebuild

    98 model imported from Germany( wich is the only country that required a catalytic converter for the RS250 to be road legal), only did 160km/100miles last year and it did go perfect.. I wanted to be on the safe side, so I ordered a top end kit from TTW, last week I took the engine out, to get the job done. Taking the right hand exhaust off the bike it had a rattle and out came some of the cat... not good. Removing the right hand cylinder head confirmed my fear, nikasil was damaged on the exhaust side. Haven’t checked the left hand yet. Is it be the broken catalytic that has done the damage?

    will keep you updated when time allows..

    new rubber for the oil tank has arrived
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  2. #2
    apriliaforum expert grendels_arm's Avatar
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    This is why cats are horrible. This crap happened to my car when the cats went bad. Because of how the emissions worked pieces of the cats got sucked back into the cylinders, scoring them. There's no Check Engine light I don't think to warn you when emissions goes bad like on cars.

    Good luck man.
    Sam

    USGPRU #88
    1998 Honda RS125
    1998 Aprilia RS250 Cup bike

  3. #3
    apriliaforum prov-nov
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    Cylinders and pistons are off, right hand cylinder and piston has some damage, left was like new. Will probably send both cylinders for replating at TTW. Click image for larger version. 

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  4. #4
    apriliaforum prov-nov
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  5. #5
    apriliaforum prov-nov
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    I’m thinking about replacing the reed valves to new oem ones. Are there no gasket between engine block and reed block?

    Does anyone have the suzuki part number for the reed valves?

  6. #6
    apriliaforum Member Kusti59's Avatar
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    Suzuki OEM Part Code:

    13153-12C10

    https://www.cmsnl.com/suzuki-rgv250-...ed_1315312c10/

    Cheers

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