Thinking Aloud

Anything related to Lambrettas... ask tech questions, post helpful info, or just read and learn.
User avatar
Doom Patrol
registered user
Posts: 1823
Joined: Wed Jan 07, 2009 5:03 pm
Main scooter: Jet 200
Location: Second star on the right and straight on till morning
Contact:

Can you bore an original 175 barrel out to 185, and what size would that be? And what piston would you use?
User avatar
vegansydney
registered user
Posts: 223
Joined: Wed Jan 28, 2009 8:52 am
Location: New York City
Contact:

The most obvious choice if you want to keep the TV rod, or use an RD400 one, is the TS185-ER.
User avatar
Doom Patrol
registered user
Posts: 1823
Joined: Wed Jan 07, 2009 5:03 pm
Main scooter: Jet 200
Location: Second star on the right and straight on till morning
Contact:

Oh, it's one I found whilst poking about in the shed. The only reason I asked is because it's had a seize and there is a deep gouge. I think it's beyond a honing, which is why I asked about boring it out. I did think of the TS185 pistons.
User avatar
vegansydney
registered user
Posts: 223
Joined: Wed Jan 28, 2009 8:52 am
Location: New York City
Contact:

OEM TV pistons have a substantial number of oversizes. I’ve seen Borgo oversizes as large as 63.6mm and have a Hepolite on the shelf that is 63.0mm. IMHO I’d explore this option on an original cylinder before looking into the TS185ER pistons.
Warkton Tornado No.1
registered user
Posts: 296
Joined: Mon Oct 17, 2011 6:16 pm
Main scooter: Lambretta SX200
Contact:

These days, there are more & more manufacturers supplying Lambretta specific oversize pistons.

However, unless there is something 'special' about them (apart from the 'special' high price) then my default choice is to select a piston intended for a decent motorcycle engine producer.

The TS185 is a very good piston & can be had very cheaply (preferably genuine)
Post Reply Previous topicNext topic
  • Information
  • Who is online

    Users browsing this forum: Amazon [Bot], Semrush [Bot] and 30 guests