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CB500/550 / Re: CB550 Valve Guide O Rings - not valve guide seals
« on: January 12, 2020, 02:53:35 PM »
Hi Chris
I did a rebuild on a GL1100 back in about 1997 it had done 72k and was striped to replace the primary drive chain, All the shells were platiguaged and pistons bores etc measured and all came out within tolerances.
So I replaced primary chain brought all the gaskets o-rings damaged bolts were replaced , All the valves were lapped in valve stem seals replaced and then I decided before rebuilt to replace the crankshaft shells as they had light scoring but left the pistons and rings , Big Mistake!!
After the rebuild it all ran fine and sounded really sweet but on load going up hills or overtaking a plume of blue smoke could be seen behind it which was really disappointing after pumping about £1100 into it .
I then made tools to pressurise each cylinder with a compressed air source and remove springs etc so I could fit new valve stem seals in situ.
That didn't make the slightest bit of difference. It had to be the fact that I hadn't replaced the rings rebored etc , they were all perfectly clean but false economy in the long term.
Now wings are known to use a bit of oil and consumption wasn't high but embarrassing when out with other bikes.
John
I did a rebuild on a GL1100 back in about 1997 it had done 72k and was striped to replace the primary drive chain, All the shells were platiguaged and pistons bores etc measured and all came out within tolerances.
So I replaced primary chain brought all the gaskets o-rings damaged bolts were replaced , All the valves were lapped in valve stem seals replaced and then I decided before rebuilt to replace the crankshaft shells as they had light scoring but left the pistons and rings , Big Mistake!!
After the rebuild it all ran fine and sounded really sweet but on load going up hills or overtaking a plume of blue smoke could be seen behind it which was really disappointing after pumping about £1100 into it .
I then made tools to pressurise each cylinder with a compressed air source and remove springs etc so I could fit new valve stem seals in situ.
That didn't make the slightest bit of difference. It had to be the fact that I hadn't replaced the rings rebored etc , they were all perfectly clean but false economy in the long term.
Now wings are known to use a bit of oil and consumption wasn't high but embarrassing when out with other bikes.
John