Twisted Crank

Anything related to Lambrettas... ask tech questions, post helpful info, or just read and learn.
fsmlittler
registered user
Posts: 67
Joined: Mon Jan 23, 2012 1:48 pm
Contact:

I've just replaced my crank with a new SR one along with all new seals and FAG bearings but having put the flywheel on it seems to be catching slightly at one point....I am assuming this means I'll have to get the crank back out and checked to see if it's twisted?

Also does anyone know anywhere in Windsor/Slough area where I can take the crank to have it checked and straightened if necessary?

Or is it possible my new crank isn't twisted and I'm worrying unecessarily?
Lamaddict
registered user
Posts: 854
Joined: Wed Jan 07, 2009 8:35 pm
Contact:

It might be catching on the drive end bearing plate or even the mag housing. Is the crank fully home?
User avatar
drunkmunkey6969
Moderator
Posts: 2838
Joined: Sun Jan 04, 2009 1:42 pm
Main scooter: '69 Lambretta GP
Location: North Yorkshire
Contact:

If the flywheel is visually oscillating.....its most likely that the crank is twisted.
See our YouTube scooter channel for Tech-help: https://www.youtube.com/c/TheScooterFactory/videos
fsmlittler
registered user
Posts: 67
Joined: Mon Jan 23, 2012 1:48 pm
Contact:

It's definitely the flywheel and it is only catching in one place and very lightly at that. I have tried to see if there is any visual evidence of the flywheel oscillating but I'll have a closer look tonight and try and measure it to see if there is any appreciable movement.
Darrell Taylor
Dealer
Posts: 752
Joined: Wed Apr 06, 2011 8:43 am
Main scooter: LAMBRETTA
Location: Doncaster
Contact:

might be the stator mounted off centre leaving the pick up catching

or as its a new crank you might have a mismatch on the tapers which can leave the rotor nipped up offset with the appearance of a twisted crank, so always best to lap the 2 together (stator plate removed)with fine valve grinding paste until you get the taper to grab
feel free to use this link to contact me on facebook and like it(if u like it)
https://www.facebook.com/pages/Taylor-T ... 8819767924
Post Reply Previous topicNext topic
  • Information
  • Who is online

    Users browsing this forum: Ahrefs [Bot] and 3 guests