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The last of the Tonti frame motor bikes.

Given all the great input, I'm guessing my main clutch issue was resolved with a new slave cylinder piston seal, but I'll also want to revise some maintenance practices. Thanks for all the suggestions! I have changed out all the brake/clutch fluid every year - using a Mityvac to pull fluid out through Speedbleeders. I assumed that if there's little/no air in the system when I start, and I don't run the reservoir dry, it should be all good. I do try to re-bleed if it feels noticeably spongy. My current thought is that the tacky sealant on the Speedbleeder has dried out, letting some air enter, giving the feel of a broader clutch engagement/disengagement zone. If I find the clutch well-behaved next season, I'll plan to install a remote bleeder for the clutch slave, and extend my relationship with this beast. Longer term, it's not clear that I am enthusiast enough to continue fighting the increasingly demanding maintenance battle that will be needed. I have dallied with the idea of moving to a more casual relationship with a new Triumph 400 that's 150 lbs lighter, and in concept might provide a similar joy of movement.

Well, lets' face it. They are all just air pumps. The Mighty Scura had Mike Rich flowed heads, which IHMO was the main thing. He told me they were the best Guzzi heads he'd ever done..still had records.

About two months ago I gave her a service, including solving the wheep from the gearbox exit shaft seal. Discovered the seal was not installed all the way, so instead of replacing it, I tapped it a bit deeper. Then the wheep turned into a leak. So I went in again and disassembled the rear AGAIN, this time to replace the seal. Oh well....

Install them. I have them in mine. The only other engine mods besides fuel tuning is an exhaust crossover (FBF), aftermarket mufflers (MAP) and airbox modifications. The power increase is palpable. It will pull to the rev-limiter in 6th gear. I wanted to send my heads to Mike but never did.

Here is the correct kit from Stein-Dinse: https://www.stein-dinse.com/en/front-brake-master-cylinder-repair-kit-brembo-ps-13/item-2-1098059-GU28659378-.html And from Wendel (but almost triple the cost!): https://wendelmotorraeder.de/pump-revision-kit_gu28659378-p-1005001.html Best Euro price at TLM: https://tlm.nl/moto-guzzi-triumph/286593780000-revisieset-rempomp-ps13-lm1000-c1100

Thanks everyone for your suggestions! I was able to find the tank cap screws and some smaller ones at a local hardware store. For the the other dimensions, I placed an online order. I must say, the updated look is a great improvement in my view.

I don't know how many miles the OP's engine has on it, but the valves and valve guides seem to be made of some sort of hard cheese, maybe Parmesan. If you are replacing the pistons I would also makes sure the valves and valve guides are good. It would be a good time to have the port work cleaned up as well. You don't need the ports hogged out or anything, but cleaned up and matched well would be nice. The heads have to come off to do the pistons, so you might as well have the heads done.

And yet it apparently is. The search for the MG part number at Stein-Dinse, a reputable supplier, threw up apparantly conflicting results. I see your point entirely, but also the value of pointing out that one may need to look closer when a simple search throws up apparently conflicting results. NB: searching using the Brembo part number threw up several results from other suppliers that seemed to be consistent. Perhaps that is the better method in this instance.

There is a Brembo part # (110436292) and a MG part # (GU28659378) . . . it shouldn't be too hard. For the sake of clarity and to alleviate confusion for current and future readers looking for references, maybe we could all try to refrain from posting multiple unproven links to replacement parts.

Sure docc's quick, but can be wrong . . . Now the matter of certain suppliers listing the kit as "PS 13" which implies 13mm, not the correct 12mm? So, I used the Brembo part number, 110436292, and see the best US price from OPP Racing ($18US): https://www.oppracing.com/product_display/202872-brembo-oe-spare-part-master-cylinder-brake-12mm-seal-set-for-front-master-110436292/

Bummer!! That's the main problem ordering clothing sight unseen, nothing like trying it on and feeling, seeing or even smelling it. . . (leather...!) Add all the different size standards between US, UK and Euro and the added burden of high shipping costs and delays when coming from overseas, you really have to take a chance. Hope the new one fits you right!

Man, I do appreciate that! I see my error caused @audiomick's links to be in error from my mistake. Sorry, y'all!

Found the reference thread that confirms that...

Thanks, docc. That's for the clutch master cylinder, isn't it? [docc edit: I posted the wrong part for the clutch master cylinder rebuild kit, so these links are not correct, either. My bad. @Speedfrog posted the correct part below. ] For the europeans, Stein-Dinse and Wendel both seem to have an equivalent: https://www.stein-dinse.com/de/bremszylinder-reparatur-satz-ps-12/item-2-1045955-17659352-.html https://wendelmotorraeder.de/rep-satz-handgeber-12er-rund_gu17659352-w1-p-6111800.html In fact, Wendel has two alternatives, but I'm not convinced that the price difference justifies this one... https://wendelmotorraeder.de/bausatz-hpumpenueberholung_gu17659352-p-1001708.html

Good evening everybody, last year I build my personal Guzzi café racer . Unfortunatly I didn´t get younger in the past 63 years, so I prefer riding on my V 85 TT, the best Moto Guzzi ever left the factory in Mandello del Lario !!! Best regards ! Jürgen

…you guys are gonna laugh, it doesn't fit! I was so excited, it came very quick, via FedEx. I open the box and at first think it's the wrong color, appearing very brown. It did say it's Oxblood, but it far too brown for my liking. Then I try it on and can't zip it, literally. If you met me, you'd really laugh, I'm a skinny guy (5'10", 160lbs, 33" waist). 65 euros for return postage, swapping from a 40 oxblood, to a 42 black. Sheesh!