Cylinder repair

[whitey]

I thinking about getting my cylinder sleeved. It's an aluminum, nikasil lined cylinder for my Aprilia SR50. I soft seized it a couple times and it has low compression. It's a Fabrizi LC kit I got from a guy from Italy. Has anyone tried this before? I talked to a guy who does this service and he says it should be easy. Here is his website
http://www.smallenginemachineworks.com/home

[Dr_Craw]

i would ask for a quote for such a thing, in my experience buying a new jug and piston is usually cheaper...
*edit* but from the site it looks to be quite reasonable, you should let us know if you get it done!!
if you can find replacements that is.
Did you figure out what was causing the soft seize?
did you just bugger your rings? might be an alternative

[Dr_Craw]

as a side note, guys that do this kind of thing are always in short supply, kinda sucks that this kind of work is replaceable parts so in the future there will be very few people that have this kind of knowledge and ability to keep our archaic toys alive

[whitey]

John says it will be in the $200 range. I will need to buy a new piston also. This cylinder was a little rough from the beginning. It also has pits in the casting from Fabrizi. It's a 44mm stroker cylinder kit so it's not cheap new. I'm really interested in this service and I just want to see his work.

[whitey]

I bought it off ebay like that. The story goes, Italian dude who raced gokarts had this cylinder on his Piaggio NRG which was his toy when not kart racing. He moved to the U.S. and brought his whole NRG engine with him. It sat for years till he decided to just sell it. It included the Fabrizi cylinder kit and matching Fabrizi crank. The cases were bored out for the bigger skirt and bigger crank. It came with two Dellorto carbs, 26mm and 28mm, one had a NOS wet injector built into the carb. It had Malossi overrange and variator. It had the matching Fabrizi pipe with a twist. It had a flange welded onto the header where a powervalve could b attached. It also came with Malossi inner rotor and rear tire. I removed my 07 Morini ditech engine and bolted this up with minimal mods. I couldn't get it to preform like it should, high revs but no power. I could turn over the engine with one finger on the flywheel. It has basically no compression and all those pits in the cylinder walls doesn't help. I think the pits are perosity from a crappy casting by Fabrizi years ago. I'll post pics if I have this work done.

[deuce217]

Those pits may retain lubricant better than most bores : )

[whitey]

I finally found a suitable piston. I've been searching and emailing suppliers for help finding a matching piston. All I needed is a 47.6mm piston with the ring gap located in the center of the piston on the intake side. Nobody could help me not even Fabrizi. While searching I found a good pic of a Polini evo piston and it shows the gap where I need it. I ordered from SIP Scootershop for cheaper then every where I looked. When it arrives I'll double check it's what I need and then send the cylinder and piston to get sleeved!

[whitey]

I sent the cylinder and new piston kit to the man. I'll show some pics of it when I get it back. The piston and pin have some kind of slick substance on them.

[patthesoundguy]

Those pits may retain lubricant better than most bores : )

I was thinking the exact same thing!