Valve interchange

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wyorat

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• Dec 14, 2013

• #1

It appears that all (70-84) xs 650's shared the same valves. Just wanted to confirm that early valves will fit in a later motor.
TIA

 

NONclow

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• Dec 14, 2013

• #2

Essentially yes, a few very minor diffs-- check this thread out: http://www.xs650.com/forum/showthread.php?t=32387

 

TwoManyXS1Bs

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• Dec 15, 2013

• #3

Here's the bulletins:

 

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5twins

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• Dec 15, 2013

• #4

So it appears they'll fit, just need old style keepers with them? Is that what we're saying here?

 

TwoManyXS1Bs

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• Dec 15, 2013

• #5

5twins said:

So it appears they'll fit, just need old style keepers with them? Is that what we're saying here?

Click to expand...

Yeah, just gotta watch that frankenbike parts mix-mismatching. Those older valves and keepers may be showing up in the used parts market...

 

gggGary

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• Dec 16, 2013

• #6

Do I read into this if a guy were to be doing say an overhaul, hop up of an early engine, late style valves and keepers is a very good idea?

 

TwoManyXS1Bs

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• Dec 16, 2013

• #7

gggGary said:

Do I read into this if a guy were to be doing say an overhaul, hop up of an early engine, late style valves and keepers is a very good idea?

Click to expand...

I would say so. Don't like having sharp corners in highly-stressed parts. This bulletin may have come as a result of cost-cutting, or from problems in the field, or from the racing community. I've always known the curved-notch keepers to be the better design, but would be great if some race-engine builders would chime-in here...