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I got a reproduction fuel cap with my pile of bits, but as it had no seal I bought another from Stafford Show. Once I had the tank on, that was the cap I fitted but petrol fumes started to melt it! So I swapped the seal over to the first one. It’s not melting but the material does appear to be going crumbly. Also had no breather hole, which possibly explains why my little test ride last night involved a few unscheduled stops. It’s got a 1mm hole in the middle now so we’ll try again tomorrow.
I think I’ve seen an alloy version somewhere. Can anybody point me to it?
Ian

Hi Ian

i bought a very good replica fuel cap from bevelrubber in Australia . it has a domed innercap with venthole and a leather seal . fitted better then the Indian made rep caps to.

Eldert

Hi Ian
There was a dodgy batch of caps made in India made of plastic that melted. That was years ago and I suspect they have found there way back onto the market again. Not had any complaints about the later bakerlite caps made in India, but I'm sure Bevelrubbers caps are better design and qaulity. You only get what you pay for
Nigel

Thanks Nigel, got it from someone reputable, mentioning no names, but not you!
Bevel Rubber version is a bit pricey, so perhaps will see how I get on for a bit.
Can’t find the alloy version anywhere, so perhaps I imagined it?

There were some aluminium fuel caps around a few years ago for fitting to the Elite/175 models with a screw cap.
I have got one on a 175 Sport.
The problem with them is that the aluminium that the cap is made from corrodes to the threaded steel tank neck and becomes very hard to remove, certainly too tight to remove at the gas station when re-fueling.
With the recessed cap on the Elite and 175 Sport tanks it is almost impossible to get a good enough grip on the cap to unscrew it. I finally removed mine with a hammer and a block of wood.
I would try and find a quality plastic or bakerlite one that is fuel resistant and use that.

Jon

Pretty sure ones from a Benelli or Wards are the same as for a Ducati. I’ve seen loads of NOS ones on eBay over the years. Keep an eye out for one on there. Not sure if the vintage caps have a problem with modern petrol.

https://rover.ebay.com/rover/0/0/0?mpre ... 3605593793

Bike runs well with vent hole in cap, but spits fuel out of the hole. Parts Book shows an ‘anti-splash ‘ device which I think is a domed rubber piece. I’ll see if I can find one!

Made a steel insert to fit behind the leather seal, and that seems to have sorted it out. The Bevelrubber cap is a bit pricey!