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I've gone that route on at least eight Guzzis now and Millennium has always done an excellent job, no issues whatsoever. Do measure your pistons carefully and compare them to the specs. published in the factory manual. Pay particular attention to ring groove widths.
Thatís what Iím running.
Ok so valve covers offÖ gotta go get a 1Ē socket. My 14 year old daughter is becoming the best assistant everÖ so turns out itíll be a good bonding experience.
Was considering Gilardoni first... but can't find them anywhere and no indication of them returning any time soon.Found these... they seem to be the same but without the valve relief that the Sport has. The company says they will add it for me if I shoot some pics of my OEM Pistons. I think I'd rather stick with the originals, if they're in good shape. But if not, does this seem like a viable option?https://gtmotocycles.com/products/gilardoni-piston-cylinder-set-82-5mm?_pos=1&_sid=d69fd5431&_ss=rUnless someone knows where a set specifically for the V7 Sport is hiding. ;)
If your pistons don't meet specs on the ring groove widths as Charlie mentions, you could get a set of new pistons with rings to match the Millenium Nikasil job. Maybe other folks who have used those Asso pistons can pitch in with their feedbackhttps://www.ebay.com/itm/173694313413?hash=item2870fce3c5:g:BlMAAOSwKphcFoKz
I did my 67 V700 a few years ago...twice. I sent my OE pistons and Jugs to Millenium with a quick turn around. While inspecting the finished product I found tiny pits in the coating. I asked about the pits and whoever responded claimed they were OK. Held extra oil for lubrication. I reassembled and ran for several months. All was well except the guy(me) who put it together miss located the O rings in the oil channels. Popped the heads to discover both pistons and jugs wiped. Yes the ring gap was correct from multi checking on assembly. Lucked into some NOS pistons, sent it all back to Millinium. This time coating was solid through and through. Living happily last few years with the oil passages dutifully weeping. This bike gets out for weekend errands, camping trips and good old fashion tank torching joy rides.
At the risk of getting flamed, again. While the cylinders are out to Millennium, send the heads out to a machinist to be reworked. Itís already apart. Your top end will thank you!Cam
It may not apply here but I would like to throw this procedure out for discussion. After I retired I worked for a couple of years for a small business that overhauled radial aircraft engines. We sent cylinders out for chrome plating. Since replacement pistons were not available for most engines due to FAA regulations, but that's another story. So I would measure the pistons we had and send those measurements to the plater. They would grind the chrome to fit the pistons. Is that something that can be done here?kk
Millenium's Canadian liscenced shop ground the nikisill coating to match the pistons I sent them.
Yeah thatís what they said on the phone. That if I sent the pistons with they would fit everything for me.
Also assume I should swap out the rod bearings while theyíre off. Right?
At that low of miles, it shouldn't be necessary. But, it wouldn't hurt to remove one to check the bearing condition. You could check clearances with Plastigauge as well. Access is a bit of pain though - removing the oil pipe helps, but the oil pickup is still sort of in the way. If the rod bolts are the early type with lock tabs for the nuts it gets a bit more difficult (trying to unbend the old tabs and bend the new ones).
Was considering Gilardoni first... but can't find them anywhere and no indication of them returning any time soon.
You can remove the pistons with the rods still bolted to the crank. Many ways to do it, from "reasonably" force tapping them out with a socket to a wrist pin tool. I have always "carefully" tapped them out with a socket and "lightish" hammer.Always wanted to get a wrist pin puller like from the old days. A round band and a screw like shown in the manual, don't seem to be available anymore.Your doing great!!!!! Once over the costs involved, you'll have a bike you can ride for 40+ years of normal use!Tom
No no, as Charlie said, 26mm. With that said, I use the same as my axle nut size 27mm. Seems to work perfect for both.And congrats on the family bonding over a bike!Tom
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