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I've never seen a plastic pump gear before, not something the factory installed, I don't think.
Odd indeed, but I'd be even more surprised if it not a factory part. Why would someone attempt make it? It's quite complex, with a metal centre and some kind of nylon gear riveted to it. Definitely something designed for mass production, not small aftermarket batches... Unless it coincidentally fits from some Fiat (perhaps not even that unlikely), I am sure it must be a factory Guzzi part. There's no wear on the gear either, so I guess it must function fine. To be fair, I'd rather see Guzzi kept the gear driven internals, even with plastic gears. The later chain drives (and their tensioner) were a very common source of engine problems.Did the early Tonti framed 850T also had gear driven camshaft and oil pump? If those had steel oil pump gears, I'd be a little concerned (either they did not fit them originally, or they caused problems and stopped fitting them).
Well, the engine certaintly ran before, and there is no visible wear on the plastic gear, so I probably shouldn't be worried about it. Really odd, since it seems Eldorados still had steel gears. This is a domestic market V7 Special, so perhaps they tried some low volume plastic gear production, or couldn't find reliable suppliers and stayed with metal gears... I guess it is possible that it is aftermarket, but it just seems really unlikely to me.Finding 83mm cylinders seems to be difficult. Has anyone fitted 82.5mm kits, meant for the V7 Sport? I wouldn't want any vibration problems...
I also emailed to HMB, I hope they have them, otherwise I'll probably order a 82.5mm set from them, and possibly even their new oil pump (still have to measure the current one, perhaps it is fine).
Italian based suppliers here https://www.officine08.com/?session_id=r3mtt3o6pr2usi2kemdvp4h6s6
Try Teo Lammers in Holland for the cylinders, just scored a set of 82.5mm sport cylinders with broken fins for cheap. DonG
Everyone 's on holiday since Friday night and were rushing to finish off as much as possible in the week before.HMB have always replied pretty quickly to me ....their pump is made by them and not the same as the SD one. Several guzzi mechanics I know of here in France will not touch SD repro mechanical stuff.
I've had no issues Charlie but they refuse to fit the SD pumps, main bearings or drive box gears and as both of them are as experienced as you in Guzzi if not more so I listened to them when rebuilding mine ....the only replacement I had was the pump though.
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