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Thread: HELP!!!!Piston seizures after rebore on 4 stroke!!

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    Default HELP!!!!Piston seizures after rebore on 4 stroke!!

    So this is the first bore with a new piston.
    Yesterday I idled it for sometime and took it out for a break-in run but experienced multiple seizures as it warmed up!!!
    Also, sometime later lots of white smoke started coming from exhaust
    I got the rebore done because I faced same problem earlier too..
    Now I suspect that maybe oil is burning but the levels are not going down...
    Please someone help me with this issue!!!

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    Moderator The Monk's Avatar
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    Default Re: HELP!!!!Piston seizures after rebore on 4 stroke!!

    Query Approved

    Please provide a bit more history of the bike, the model etc.
    Biking is not about what you have between your legs, its all about how well you use it!!!!!!!

    Give your details here if you want to help your fellow xBhpian stranded in your city

    Touring Blog: Cycling in Mongolia!

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    Default Re: HELP!!!!Piston seizures after rebore on 4 stroke!!

    The bike is a yamaha libero from 2004
    It is a 105cc bike

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    Default Re: HELP!!!!Piston seizures after rebore on 4 stroke!!

    Can oil leak into the combustion chamber from the head gasket?

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    Sadakchhapp black asp's Avatar
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    Default Re: HELP!!!!Piston seizures after rebore on 4 stroke!!

    Quote Originally Posted by ride4life View Post
    So this is the first bore with a new piston.
    Yesterday I idled it for sometime and took it out for a break-in run but experienced multiple seizures as it warmed up!!!
    Also, sometime later lots of white smoke started coming from exhaust
    I got the rebore done because I faced same problem earlier too..
    Now I suspect that maybe oil is burning but the levels are not going down...
    Please someone help me with this issue!!!
    This is common with run in of 2 strokes especially old ones like yezdi. If it happens in a 4 stroke it means your bore is not rebored properly and the liner is oval.
    Piston may run lopsided and heat up more leading to a seizure.
    My suggestion get a new bore kit and redo the valve oil seals too

    CHEERS
    Yamaha RXZ 5 speed (sold)
    Bajaj Pulsar 220 DTS-fi( sold)
    Bajaj Discover 112(2006)
    Yamaha R15 v2(2011)
    Yezdi 250 model B(1978 )
    Yamaha RX 135 4 speed(1998 )
    Yamaha Rajdoot 350(1989 unrestored)
    Bajaj pulsar 220 DTS-i (2011)

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    Default Re: HELP!!!!Piston seizures after rebore on 4 stroke!!

    Thanks for your reply.
    I checked the valve oil seals and piston rings but could not find any issue with them.
    I do know that the oil is entering from the gasket which I replaced two times but cannot get the oil to stop.
    The seizures are just because the piston rings are not seated yet and I did notice that the seizures are getting less and less after every ride.
    My main issue now is the oil leakage.

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