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Hi All, the rear brake master cylinder on the 1200 looks like it needs a rebuild kit. The rear brake keeps filling with air soon after every time I bleed it. Then this last time it doesn't want to pump hardly any fluid at all when I tried to bleed it. This is a 1200 Milano but it looks kinda like th...

As John says, a compression test is usually done by first running the engine for a while. I was always taught to then quickly drain the float bowls and make sure the incoming airway wasn't obstructed. In other words wind the throttle wide open then do the test :D Just kicking it over with the meter ...

Ditto, same problem here. Our fix was a new black moulding made from fibre composites, directions for how to do it this way are in a previous issue of A Tutto Gas. IMHO both the fixes (metal and fibre composite) look good on the bike and have clocked up significantly more mileage than the originals ...

Sometimes also the thread on the plug (or the body) doesn't go quite to the end and when tightening it hits the end of the thread and not the tightening face and everything goes wonky.

Possibly the face on the body that the plug is tightening up against is not square to the axis of the bore. Or the face on the plug is not square to the axis. When you tighten the last bit, either would put the axis of the damper rod out of alignment with the axis of the bore in the body.

As I wait (clearly not very patiently) for the manual to download, fork oil weight and capacity? 10w and 225ml (came out) The manual says really light oil, which translates to something like 5W which is fine if your damper rod internal seals are nice and new. However generally they are not, in whic...

Same size seal as used by Moto Guzzi in the forks of the V7 Sport, 850-T, T3, T4 Convert, etc. 350 with the same size forks as much bigger bikes, no mystery why they have a good reputation for handling. The forks are actually considered undersized on those Guzzis. :D Isn't it scary to think that he...

AntietamClassicCycle wrote: ↑29 Jun 2025 13:22 Same size seal as used by Moto Guzzi in the forks of the V7 Sport, 850-T, T3, T4 Convert, etc.

350 with the same size forks as much bigger bikes, no mystery why they have a good reputation for handling.

Myself I use a single lip version for the bottom one and a double lip for the top one. Having said that I used to use all four single lip and that was ok too as long as the dust caps (or gaiters) are in good condition.

Mine simply has a wide black cable tie Not tight, just enough to allow flex on the rubber foam the back of the tank sits on.

Sounds like a plan.
They definitely run better with use.
Enjoy

Very strange then, that it's compression is low compared to those at Bristol. If the valve seats are good, the bores good and the head gasket ok and it runs fine it hints at maybe it's compression rings being past their best. Anything else would probably make it a bad runner. I should have asked, do...

Its good to hear the valves were seating ok. The manual specifies quite a narrow seat width if I remember correctly?
How did the bore look?

Fair comment its your bike after all to do as you wish. I'm not going to condemn anyone for riding Morinis on a sunny day. My word of caution is that mine was the exactly same, the one that burned out a valve in France. Then it cost me a lot more to fix a valve and a new seat in the head, and the wo...

If you had the composite ones I wouldn't reuse them. The solid aluminium ones people regularly reuse if they look flat. I think ideally you are supposed to anneal them by playing a blow lamp over them about 5 seconds. They shouldn't need the likes of hermetite. Mdina if your gasket is too bad. Getti...