Valve issues
Moto Guzzi 250 TS, 350 NTX, 650 NTX, 750 NTX, 750 SP, 750 T, 750 XPA, Breva 750, Nevada 350, Nevada 750, STR V750 IE, Targa 750, V35, V35 Florida, V35 II, V35 Imola, V50, V50 II, V50 III, V50 Monza, V65, V65 Florida, V65 SP, V7 Café Classic, V7 Classic, V7 II Racer, V7 II Special, V7 II Stone, V7 Racer, V7 Special, V7 Stone, V75, and V85 models
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Rod Yeomans has covered valve issues in his review articles, so be sure to read those. Here is some additional insight from others.
Thanks to David Bakkers for sending me this information via e-mail. In David's own words:
While reading the section on your site about small block 'Guzzis and exhaust valves, I'd like to mention a modification I did to a V65 that I used to own many years ago.
I too burned out the exhaust valves after using pod air filters and a too lean fuel mixture, but Epicycle Racing (A Ducati specialist who used to be in Epping, NSW) had a solution. They replaced the exhaust valves, guides, springs and collets with ones from a Japanese bike (I think it was Yamaha XJ950). The valves had the same face diameter and length, but a thicker stem and were sodium filled. The larger diameter stem transferred more heat to the valve guides and never gave a day's problem.