No tachometer at low rpm

[xs650newb]

Hello,
With the engine at an idle up to approximatley 25% throttle the tachometer is completely unresponsive.

Once I get above 25% the tach will finally kick in.

I figure there are two likely causes

1) bad oil pump
2) something causing friction in tachometer

To check the oil pump I have heard to open a tappet cover and see if oil sprays out. Should I open intake or exhaust? Should oil spray out at idle, or do I need to rev it a bit?

If the tachometer is gummed up I was thinking about some teflon spray. Thoughts?

Thanks,
Adam

 

[CDNTX650]

pull the tach cable off at one end....if the little cable with the square end inside spins, your pump should be working.

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