Sleeping beauty has spongy clutch.

[made2care]

Well, cant figure this one out. I rebuilt the master cylinder, bled lines way back 6 months ago. Now that its warm outside, clutch lever becoming spongy. Does fine at the beginning of the ride, but once she warms up, the lever goes soft. 30 min after the bike sits, clutch lever is back to normal. I have checked for leaks, no leaks. fluid level is fine. Original lines.
Any suggestions?
thanks.

[robb]

Did you use Dot4 fluid. Have you tried to bleed at banjo fitting. If you still can't get the clutch to work properly you can tie the lever down, turn the handlebars to the right and leave it over night.

[Happytrails]

Have you had a chance to rebuild the clutch slave cylinder yet? It may have gummed up inside and needs cleaned/rebuilt. Can not guess why it does it after 30 min and then fine again. But it is one more possibility.

[Rob H]

Did you use Dot4 fluid. Have you tried to bleed at banjo fitting. If you still can't get the clutch to work properly you can tie the lever down, turn the handlebars to the right and leave it over night.

This has worked for me in the past, I normally pump the clutch or brake lever(whichever is applicable, it works for both) until it feels normal then cable tie it to the grip and leave it overnight.

Next morning just cut off the cable tie and the lever feels great!

Rob