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Valve stem seals question


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My trx300ex appears, to put out some bluish oil smoke for about 30 seconds when first started in the mornings. Would this most likely be due to worn valve stem seals? After the first start of the day, it doesn't smoke. Thanks

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Thats exactly what it is, oil is leaking down into the combustion chamber from bad seal, doesn't really cause any problems, I just don't like seeing the smoke. I have a John Deere that does that, it started doing it after the second year of service, and it doesn't have many Hrs on it it bugs me but I try to ignore it.

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18 minutes ago, Gwbarm said:

The sad part , you could have replaced them very easily when you had the head off.

I think, all I took of was the top cover to change the timing chain or, do they make a spring compressor for ATVs where you don't have to pull the head to the back side of the valves also? Please, correct me if I'm wrong working on atvs is a new adventure for me.

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Yeah, that's what I'm going to do. I've got to find out what's up with my rear brakes now. I must have a leak somewhere the rear master cylinder level is really low with no resistance at all to the pedal. I wired the pedal down when removing crank case cover and forgot to release it. I guess being under pressure, the fluid found a weak point to exit. Seems like one thing after the other lol!

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