100 mph on a lambretta was bloody difficult 20 years ago

General scooter chat, any scooter related non technical info.
mick1
registered user
Posts: 1292
Joined: Sun Dec 04, 2011 7:43 pm
Main scooter: Li Avanti 225
Location: York
Contact:

Don't give up !! Go to flicker and upload your image. Double click on the image and it will open in a new page. Bottom right is a curved arrow....click arrow. Click BBCode from the 4 options, double click location bar that appears and it should "blue" out. Right click and copy. Paste this where you want it shown. it won't show a picture till you preview or submit. I use medium size 500 x 375.

Don't give up !!
mick1
registered user
Posts: 1292
Joined: Sun Dec 04, 2011 7:43 pm
Main scooter: Li Avanti 225
Location: York
Contact:

Using the links above i got onto your flicker and did as wrote in my reply

Imagebarrel.3 by 100 MPH LAMBRETTA CLUB, on Flickr

Image028 by 100 MPH LAMBRETTA CLUB, on Flickr
100mphlambrettaclub
Dealer
Posts: 120
Joined: Thu Jan 08, 2009 10:58 pm
Contact:

Cheers mick for the next ones i will. There were four umages altogether
mick1
registered user
Posts: 1292
Joined: Sun Dec 04, 2011 7:43 pm
Main scooter: Li Avanti 225
Location: York
Contact:

Stick to getting over a 100mph and leave the difficult stuff to us :mrgreen:
mick1
registered user
Posts: 1292
Joined: Sun Dec 04, 2011 7:43 pm
Main scooter: Li Avanti 225
Location: York
Contact:

What's the engine spec' ? Barrel, modified casing, crank, etc ?
100mphlambrettaclub
Dealer
Posts: 120
Joined: Thu Jan 08, 2009 10:58 pm
Contact:

Found the old spec sheet from 15 yeaes ago. Some museum pieces when it comes to modern day tuning
Class 2 – 250 cc Motorcycle Racing

Frame 1970 GP 125
Lengthened by 4 inches
Steering angle altered to 55 degrees
Forks lowered by 4 inches
Top shell removed replaced with tubular steel section lowered by 2 inches.
Carbon fibre seat fairing from Aprillia 250 GP motorbike
Cut down carbon fibre leg shields and GP carbon fibre horn casting. NRG light weight front mudguard

Suspension
Front forks stiffened with 3 inch spacers and shortened springs
Rear shocker replaced with solid bar and lowered to 275 mm

Wheels
Front drum brake fully lightened, oil seals removed and using low friction bearings running in Teflon lubricant.
Front rims are standard Lambretta split type.
Rear rims are AF wide split type
Rear hub fully lightened Spanish type running with lightened brake shoes

Fuel tank
¼ gallon cylindrical aluminium tank, rubber mounted to prevent fuel frothing and angle mounted for fast drain.
Fuel tap ¼ inch fast flow methanol type using a one way quick release coupling

Controls
Short space ace bars mounted on LD clamp.
Throttle, Honda motor cross type.
Gear change, modified MB cast type.
Front brake leaver, Amal light weight type.
Back brake, Shimanno thumb operated paddle.
Rev counter Scitsu 12,000 rpm dial type

Tyres
Front wheel, 350- 10 Continental zippy 1 using up to 45 psi.
Rear wheel, 110/80 - 10, 100/90-10 or 350 – 10 Continental zippy 1 using up to 35 psi

Engine
1963 LI 150 casing
Crank mouth opened up to take aluminium Yamaha barrel, which has been extensively modified by MB Developments.
4 main transfers with two boost ports added by Ralph Saxilby.
Piston ported induction using a72 mm
Wiseco Suzuki TS250 piston lightened by John Floyd
Six stud central plug cylinder head from billet aluminium, running a compression of 13: 1.
GP crank with full padding using a Rotax conrod with a stroke of 60 mm. Carburettor is a Mikuni TMX 35
Fuel is Sunnoco MO2X rated at 114 octane.
Ignition stator is a Motorplat internal rotor type set at 42 degrees before T.D.C with a 2.7 degree advancer box.
Gearing is TV200 treated gear box running on 15/46 for the ¼ mile and 17/46 for the flying mile.
Clutch is an eight plate type using CLW extra strong springs. Chain is either an 80 or 81 link Regina extra and uses a light weight nylon tensioner.

Weight of the bike fully fuelled is 138 lbs
Power output is estimated between 33 to 36 bhp at the rear wheel.
Image1 by 100 MPH LAMBRETTA CLUB, on Flickr
Image042 by 100 MPH LAMBRETTA CLUB, on Flickr
mick1
registered user
Posts: 1292
Joined: Sun Dec 04, 2011 7:43 pm
Main scooter: Li Avanti 225
Location: York
Contact:

Timing at 42* before TDC..... will the 2.7* advance make much difference......tbh i'm surprised it ran that far advanced.
100mphlambrettaclub
Dealer
Posts: 120
Joined: Thu Jan 08, 2009 10:58 pm
Contact:

It worked perfectly, old system compaired to now though. Remember the type of fuel helped
Post Reply Previous topicNext topic
  • Information
  • Who is online

    Users browsing this forum: No registered users and 10 guests