Too Much Compression?

Anything related to Lambrettas... ask tech questions, post helpful info, or just read and learn.
Bilko
registered user
Posts: 1346
Joined: Thu Jan 08, 2009 12:06 pm
Main scooter: LI150
Location: Belfast
Contact:

Having an ongoing issue with the 250.

I've just snapped another kickstart shaft. That's the 3rd I've been through.

I'm also bending kickstart levers. 4 so far and I've only just got the Lambretta on the road.

What's my options?

RB250 with a MBD water cooled head
Bilko's Oily Blog

Directionally dysfunctional since 1966
dapper
registered user
Posts: 930
Joined: Tue Jan 27, 2009 5:30 pm
Main scooter: The Biriani Bullet
Location: Brighton (well Hove actually)
Contact:

What's the squish Rob? You could always put an extra very thin head gasket in until she's run in and loosened up a bit, although I'm sure an adult will be along soon to chide me and make me sit in the naughty corner for making such a suggestion ;)
Compact Toolbox Flywheel Holder
Bilko
registered user
Posts: 1346
Joined: Thu Jan 08, 2009 12:06 pm
Main scooter: LI150
Location: Belfast
Contact:

1.4 mate. :(
Bilko's Oily Blog

Directionally dysfunctional since 1966
J1MS
registered user
Posts: 1153
Joined: Sat Jan 10, 2009 12:02 am
Contact:

Kick it when it's off compression...

Or lower the compression, but make sure that's not going drop the compression too much first.

Rimg MB And ask what it's supposed to be with your chosen squish clearance, then check this to make sure it's correct. I've known one cylinderhead to be 17-1... even water cooled that's a bit on the high side.

Hope you sort it....

Mark.
johnd
registered user
Posts: 185
Joined: Wed Jan 07, 2009 7:53 pm
Main scooter: 1970 Dl125
Location: Belfast, Ireland
Contact:

What gearbox and sprockets are you using? Doesn't this have an effect on how hard it is to kick over a big engine? I'm using GP125 italian 19/46 on my 225rb and it kicks over fine.
Bilko
registered user
Posts: 1346
Joined: Thu Jan 08, 2009 12:06 pm
Main scooter: LI150
Location: Belfast
Contact:

GP200 and 47 X 18 Sprockets.

Phil @ MB was on standby awaiting my call.

Putting a head gasket on to lower compression a bit until it's run in a bit more.
Bilko's Oily Blog

Directionally dysfunctional since 1966
mark
registered user
Posts: 1547
Joined: Sat Jan 10, 2009 10:41 am
Contact:

surely that will open your squish up making your bike run hotter?
User avatar
coaster
registered user
Posts: 3125
Joined: Wed Jan 07, 2009 12:35 pm
Location: London and Norfolk
Contact:

mark wrote:surely that will open your squish up making your bike run hotter?
That's what I was thinking, best take it fairly easy.
Bilko
registered user
Posts: 1346
Joined: Thu Jan 08, 2009 12:06 pm
Main scooter: LI150
Location: Belfast
Contact:

It's just 'til it settles down, I'll not be going mad.

I've only ran it about 5-6 miles in two runs. Other than that's it only been started up at home. To lose that many kickstart shafts and levers in such a short time is insane.

Hope tthis works! :?
Bilko's Oily Blog

Directionally dysfunctional since 1966
mark
registered user
Posts: 1547
Joined: Sat Jan 10, 2009 10:41 am
Contact:

It won't lose compression unless you mod the head, the bodge you are doing will not settle down. Sorry mate but after putting this much time,effort and money into this project it's mindless
Post Reply Previous topicNext topic
  • Information
  • Who is online

    Users browsing this forum: Google [Bot] and 20 guests