[virago 535 loss of power]

I had the exact same problem - and it is now back to its full potential.

(from not a technical speaking person)

The rubber in the diaphragm on the carburettor had gotten old and fallen apart (mine 22 years old).

To fix it cost me just over £200 that was £73 + VAT for each diaphragm and £40 + VAT labour.

I wasn't able to do it myself as you need a special star like screw and a newbie for playing with bikes.

This is for anyone searching for this problem as I was searching for an answer.

Joshua - I tried the valve clearances and timings - ran a little smoother but no success until the above.

Regards

[virago 535 loss of power]

I have the 1988 Virage 535 and just had the problem talked about above.

Seems to have lost the top end of each gear and now unable to go above 70 - I have had it up to 95 ish previously!

Does anyone have the answer to this?