Valve seal replacement

[Anonymous]

Hi guys,
If I change my valve seals is it likely to help out with oil consumption? I did a compression check and found that I had 150 PSI on both sides with the right hand side taking one extra crank to reach that pressure compared to the left side. I'm burning about a half litre per thousand km when on the highway but none in the city. The bike has got about 40,000 km on it and I think it's been burning a lot of oil since 20,000 km. Is it more likely that the guides themselves are bad or I've got a scratch in one of my cylinders?

Thanks, Steve

[Anonymous]

Re: Valve seal replacement

Hi guys,
If I change my valve seals is it likely to help out with oil consumption? I did a compression check and found that I had 150 PSI on both sides with the right hand side taking one extra crank to reach that pressure compared to the left side. I'm burning about a half litre per thousand km when on the highway but none in the city. The bike has got about 40,000 km on it and I think it's been burning a lot of oil since 20,000 km. Is it more likely that the guides themselves are bad or I've got a scratch in one of my cylinders?

Thanks, Steve

hey srivett;
Did you do a leak down test on the cylinders? You might want to check to see if the hold pressure if so then maybe the seals have a slight leak but the mileage you have on the twin doesn't seem excessive, but it all depends on how well it was maintained over the years.

[SqDancerLynn1]

The twenty year old valve seals are probably old and dried up

[saaz]

Old seals get hard and don't seal as well, or don't make up for a little wera in the guides. Usually you will notice smoke on start up with seals gone. You oil consumption is more like rings, but as compression is ok, and assuming you have not broken an oil control ring, the valve stem seals/guides are the next place to look