Engine and frame numbers??

[scandical]

Hi,

I got my first Lambretta (Li150 s3) about a year ago and am now in the middle of adding a Gori kit and upgrading to Casa electrics.

Once the chain case was off I noticed the kickstart shaft had been rubbing on the clutch top plate and basket. It had clearly been welded at some point and I thought I'd replace it with a new shaft, rather than grind the repaired one down. I looked online only to find there are two types available, depending on year... pre 68 and post 68

Although my Li is registered as 1966, out of curiosity I pumped the engine number (150Li 799XXX) in to scooterhelp and it came up Li 1959/60

Realising that scooterhelp may not be 100% reliable on this, I checked the British Lambretta Archive; the frame number (150Li3 736XXX) comes in as an s3 li150, but the high engine number suggests a Li150 special as it says the Li150 engine numbers went up to 700,001.

http://www.britishlambrettaarchive.co.u ... -info.html

Being new to Lambrettas, I'm a bit lost with all these production numbers and no closer to working out the year of the motor! I'm pretty certain my motor is a series 3 as it has two sizes of studs on the casing.

Can anyone shed any light on this so I can get on and order the right parts?

Alan

[rosscla]

Can't comment on the numbers from knowledge but if the side casing doesn't have a very prominent outward bulge for the kickstart stop then it's likely S3. The number of ribs around kickstart shaft would also help,identify the side casing.

Inside an early casing the main bearing is more enclosed / less visible with the front sprocket removed.

It is possible the casing could be an earlier one built up with later parts in a mix and match

[HxPaul]

double post.DELETED

[HxPaul]

The only difference is,one shaft is an Li,TV,SX and the other is a GP.GP's were made from 69,before that they were Li,TV,SX type shafts.Both can be used,assuming that your using a series 3 side case cover(GP side case covers are easy to identify from the outside because they have a round bump at the bottom of the clutch actuator tunnel),if you use the later shaft on an early series 3 side case you may need a 1mm shim on the outside of the shaft.By the way most people have trouble with the inside of the kickstart shaft rubbing on the top plate of the clutch,the usual cure is to grind the kickstart shaft were it rubs.

[scandical]

Thanks for the advice, chaps.

I'm now pretty sure I have a series 3 Li150.

I've ordered the earlier Li kickstart shaft version and like you suggest, will grind it down a bit if I find that it's rubbing.