Scooter Tuning Tips: Lambretta & Vespa scooters - how to set up Ignition Compression Jetting Exhaust
Ignition curves can be tweaked and pushed backward/forwards throughout the RPM range in the pursuit of power. Cylinder heads have endless combinations of combustion chamber design, size, shape, depth, volume, corrected, uncorrected, squish band area, squish gap, squish velocity, and so on. The manipulation of it all can be a bit like a Rubik’s cube, adjust one setting, and watch how it affects all the others. I personally find it fascinating and having owned a dyno, the main thing I learned about ALL two-stroke tuning is, the more you learn, the more you realize how much you don't know! ;)
But for those who are not familiar, or even interested in these intricacies and adjustments, for those who have shied away from even attempting to set any of these important parameters properly, I have put together a very basic guide and suggested a simple setup procedure. I can’t claim this is the ultimate setup, or that it is the most powerful setup, but the steps suggested should make it easier for scooter owners to take more responsibility for their machines, and get involved with the mechanics. So this video provides what I would outline as a ‘safe average’ that balances power, reliability, and efficiency… and that is no bad thing.
00:01 Intro
01:12 Ignition Timing
01:50 4 Star Leaded vs Unleaded
03:12 Variable Ignitions
08:36 19-21 BTDC?
09:40 Problems on dynos
11:41 Compression
14:10 What ratios?
16:40 Squish Gap
21:06 Thick gaskets are not about compression reduction!
22:30 Balance the jetting
22:56 Exhaust Stingers
27:21 Don't trust timing marks
Darrell Taylor's guide to measuring compression: www.scootering...
Amazon links to further resources…
Suggested reading:
The Complete Spanner's Manual: Lambretta Scooters: amzn.to/3qX3R1v
Haynes VESPA Service & Repair Manual: amzn.to/3rNR2aY
Haynes Vespa Scooters 1959 - 1978: amzn.to/3rPov4M
Two-stroke Performance Tuning: amzn.to/3eG8quk
Motorcycle Tuning: Two-Stroke: amzn.to/3qSUpMd
Oil:
Castrol A747 Racing Oil: amzn.to/38GfUda
Castrol ‘Power 1’ Two-stroke oil: amzn.to/3eJe3Ie
Parts:
Supergrip Lambretta 5 Plate Clutch Kit & Springs: amzn.to/3bLeK1Y
Lambretta Adjustable Rear Shock Absorber: amzn.to/3qHYOli
Lambretta Viton Engine Oil Seal Kit: amzn.to/3rKWlrw
Vespa PX/PE/T5 Viton Oil Seal Kit: amzn.to/3cA6VuX
Security:
Oxford OF802 Monster Chain & Lock 1.5m: amzn.to/3vo3Ab3
Oxford OF178 GP Chain Lock: amzn.to/3eHleAS
Oxford Products OF34 Disc Lock: amzn.to/3bLiX5M
Cleaning:
Muc-Off Clean, Protect & Lube Kit: amzn.to/2Q85n3Z
Muc-Off Cleaner, 1 Litre: amzn.to/38CX7z9
WD-40 Degreaser 500ml: amzn.to/2OS6u7o
WD-40 OIL 450ml: amzn.to/2OwV2OB
T-Cut: amzn.to/3cBKnKi
Autosol: amzn.to/3cBKnKi
Tools:
Syphon pump kit: amzn.to/3eH5TQv
5l Fuel Can: amzn.to/2Q6EjSL
Flexible funnel: amzn.to/3vq72Su
Home hobby compressor: amzn.to/3bOU756
Sealey 14 Drawer Topchest and Rollcab Combo with 239 Pcs Tool Kit: amzn.to/3rQxsuH
Gunson timing light: amzn.to/3eFd0cl
Vlog equipment:
Dragon Touch 4K Action Camera: amzn.to/3rSjhoG
GoPro HERO8 Black Bundle: amzn.to/30JVxHJ
#tuning #squish #ignition #exhaust #compressionratio #lambretta #vespa #scooter #tuning #2-stroke #scooteringmagazine #scooterist #scooterrally #howto #guide
25 авг 2024