Re: 525 piston rings

by wolfy Fri Jan 23, 2015 8:23 pm

Mine started to puff a bit jt, there was a few hours on it lol!

so thought it was time for a piston/rings & check.
Dropped it into Ray Cowles in Pontypool with a piston kit & valve stem seals job done cheers

Was told the piston was fine, but while its apart I would change the piston & seals too.

by wolfy Fri Jan 23, 2015 8:26 pm

What's a number 1 or 2 barrel size about dai ?

by JTM525 Fri Jan 23, 2015 8:53 pm

dai 530 wrote:Make sure you check the inlet valves mine were fooked on my 450 just about to go through the valve seat
and you will need to check what size barrel you have on there a no 1 or 2

I heard that's quite common on them, how do you know the barrel size dai?

by dai 530 Fri Jan 23, 2015 8:54 pm

A no 2 is bigger by 0 .002 mm usually a bike will come with a no 1 and as the cylinder wears you can pit a no 2 piston in it but some bikes have a no 2 on them from the factory it is stamped on the barrel 1 or 2 or it could be a or b

by JTM525 Fri Jan 23, 2015 8:55 pm

wolfy wrote:Mine started to puff a bit jt, there was a few hours on it so thought it was time for a piston/rings & check.
Dropped it into Ray Cowles in Pontypool with a piston kit & valve stem seals job done
Was told the piston was fine, but while its apart I would change the piston & seals too.

I think mine is catching up with yours now even if it is 8 years older lol!

I'll probably do it myself so if it all goes pete tong its on me lol!

by JTM525 Fri Jan 23, 2015 8:56 pm

dai 530 wrote:A no 2 is bigger by 0 .002 mm usually a bike will come with a no 1 and as the cylinder wears you can pit a no 2 piston in it but some bikes have a no 2 on them from the factory it is stamped on the barrel 1 or 2 or it could be a or b

Ah right i'll have a look at that when she's apart

by JTM525 Fri Jan 23, 2015 9:01 pm

phil990 wrote:On two strokes if I remember right it always seemed to wear away just above exhaust port. Check for wear and tear but on a four stroke you would be unlucky if there was any damage...

If compression is good I would say it will be valve guide seals. If piston is relatively newish just measure piston and rings for any wear...

You will need valve spring compressor, valve grinding past and new valve stem seals. When grinding in valves use just the lightest of touches..

I expect my old man will have all that gear, i'll have to go on the scrounge lol!

I'll have a look when its apart to see what's needed

by steve Fri Jan 23, 2015 9:05 pm

Thing is if you fit a all new top end all that extra compression may blow the old crank through the sump Laughing

by dai 530 Fri Jan 23, 2015 9:06 pm

When i done mine i put new cam bearings in new cam chain and tensioner new waterpump oil seals new valve stem oil seals and 2inlet valves it cost a little more but it saves striping it down again it was on 10,000 miles and the only problem was the valves

by phil990 Fri Jan 23, 2015 9:07 pm

Fair doo's Very Happy

there's plenty of good advice on here afro

and plenty of people with the knowledge cheers

I wonder if there is a financial advisor on here? Haha

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