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NPS

NPS

Cruisin' Guzzisti
GT Contributor
Joined
Dec 11, 2008
Messages
262
Location
Churchdown, Gloucester, UK
I have removed one of the two alloy nipples from under the tank on a Breva 11. It is part of the petrol spill and drain off. Under the tank this item screws in to a brass bush moulded into the tank acrylic. A tube attaches and runs down to drain.

I have got one off but one stuck. I'm switching tanks to one that is not damaged by ethanol.
The Guzzi part 30103730 costs about GBP 10 which is stupid.

I'm trying to identify the thread and get a cheaper replacement.

The OD is 6.75 mm and the thread pitch is about 1 or 25-26 tpi.

I did not measure a tapper on the thread. I'm guessing it is NPTF thread? In which case it could be 1/4 inch.

20170520 182509 1
 
Try using a metric thread gauge. It is an Italian bike so I doubt it is an SAE thread. One tap is for tank venting, the other is overflow. They are not inexpensive in the US either, $12.16 USD. I doubt is is a pipe thread (interference makes the seal) since it is installed with an o-ring. It is probably used on some Italian car, but finding the equivalent would be difficult. You may spend less time and money just buying it from Guzzi. Have you tried a penetrating oil to get out the one that is stuck? I've had the best luck with home made penetrating fluid, a 50/50 mix of Acetone and Automatic Transmission fluid.
 
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I have not come across M7 before! Yes it could be. Come to think of it some brake bleed nipples must be that size and may well fit with a little shortening. Yes John I used a metric thread gauge and it seemed to be about 1mm pitch.

Edit: found some M7 bleed nipples and ordered two for a £1 each. Will check they fit first before saying I have the solution.
 
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John I like you acetone and ATF idea. Might mkae my own. I havnt got Acetone though but I do have Methanol. Would Methanol and ATF work? I presume the solvent gets it into places and the ATF is a low viscosity lubricant, so could work well.
 
Yesterday I decided to spit the gearbox and to complete a FULL strip down of every single item on the Breva. The reason was that I was facing a job of prep the gearbox for repainting. There was quite a large amount of external corrosion and I soon realised it would be easier to strip the box down and do a proper job with surface blasting
After opening and assessing, all bearings, forks, dogs and gears look ok, except the needle roller bearing at the rear of the the clutch shaft. It felt "not" smooth to rotate and with the shaft in place there is a large amount of movement on the shaft that suggests there is a problem. I'm doing this subjectively as I don't know how much play a needle roller should have magnified by the lever of a shaft 20-30 times its length. It did seem excessive and I'm going on my gut feel that it is not right. Cheap to replace and I have it out. The other bearings are fine. The selector drum has open ball bearings. The front clutch, primary and driven have sealed bearings. They feel very smooth. I'm replacing all seals. I'm not sure how to renovate the outside so I will ask my local renovation expert. I dont want to remove the bearings and risk any damage. I would prefer aqua blasting and I might need to remove the paint with paint stripper. If the bearings can stay there then great. If not I will take a step back and do the outside by hand prep.
 
NPS said:
John I like you acetone and ATF idea. Might mkae my own. I havnt got Acetone though but I do have Methanol. Would Methanol and ATF work? I presume the solvent gets it into places and the ATF is a low viscosity lubricant, so could work well.
Click to expand...


It really needs to be Acetone. Most hardware shops (at least in the US) carry it.
 
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