Question about 2002 Yamaha DT 125 R

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Cogs in a gear box

Hi i have got a yamaha dt 125 and the piston ring and head gasket need replacing and i have been told the reason it blows up is because the cogs in the gear box need moving is that right

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Hi karen, that is right, i do have a DT 125 myself and same thing has to be done.

Usually this is balance the engine so that the moving parts will move to a limited place. this is also to avoid further block damage when the piston is moving up and down.

Posted on Jan 02, 2009

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If is violently loosing coolant from overflow then best case you need new radiator cap worst case head gasket needs replacing.

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You most likely blew it up.. you could have a leaking head gasket but its most likely your piston and rings

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Presure in raidiator


I know you said you did the head gasket, but it really sounds like a head gasket issue and pressure getting from the cylinder into the colling system. If you've had recurring overheating that necessitated another gasket replacement you'll likely have a warped head, which could explain the recurring t symptoms despite changing the gasket.

I'd do a compression test with the radiator cap off and see if you're losing compression. You'll likely need to have the head machined to remove the warping. Once machined and replaced with a good Yamaha brand gasket and a high temp sealant to help it, you should be okay. Be sure to torque the head bolts exactly in the order required and to the exact level required by the factory.

Hope this helps.

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