Wasted 2-stroke tuning - Does all 'tuning' work? Lambretta & Vespa Scooter Tuning put to the test!

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Wasted 2-stroke tuning - Does all 'tuning' work? Lambretta & Vespa Scooter Tuning put to the test!
There are many well-known and widely applied tuning methods used in building 2-stroke engines, When it comes to Vespa & Lambretta engines, some of those ideas have become practically entrenched in the mind of every engine builder and tuner. You know the ones, enlarge the transfers, match the ports, widen the spigot, radius the edges, match the gaskets and packers, cut the piston, etc. In this video, we reflect on a 3-part series that ran across the March, April & May 2020 editions of Scootering, where Darrell Taylor put those exact tuning methods to the test on two different engines, and dyno-tested the results back-2-back. The first unit was a 175cc Lambretta, ported cylinder, with 28mm carb and clubman exhaust. The second, was a fully tuned RB252 motor, with expansion chamber and 35mm carb, kicking out 43hp.
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
For more info: www.scooterfactory.co.uk
#lambretta #vespa #tuning #scooteringmagazine #scooterfactory #dyno #scooter #tuning #lambrettascooter #lambrerttarepairs ##100mphlambretta #twostroketuning

Опубликовано:

13 июн 2020

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Комментарии : 120

@bolti1000 4 года назад

I love this video brilliant. As an engineer of over 50 years I too have ALWAYS matched - it was what I was told, taught in my apprenticeship. The most I got out of this video and it is a real golden nugget about testing before and after to check efficacy something I have always done because it was always the right thing to do - right?

@markjones67 3 года назад

I bought a vespa with a 210 kit 30mm card and reed block and I was getting other vespa 200's keep up with me, when it was stripped I found out nothing had been matched so me and my mate started grinding and filling, once on the road it made a massive difference from pick up to top end but that was a Vespa and it worked for me 🤷‍♂️

@pauloconnor7951

You made a great point. The AREA of the transfer. Some are big; some not. consider the flow like a large swarm of people entering / egressing an event hall; with all it's twists and turns. sure removing a wall mounted extinguisher will help. Ditto prop the doors open. But outer radias obstruction or timber molding wont have effect; if there's a restriction due to the hall way width. A 2T engine is a fuel laden air pump. Merry Christmas all ! Paul

@DeadWeathered 4 года назад

So glad I saw this, a very interesting article. I’ve been delaying fitting the crank on my GP150 rebuild until I’d got the RT195 kit and matched the casing to the transfers, not going to bother matching now. I’ll crack on with fitting the crank, chain and clutch 👍🏻.

@fellowcraven 4 года назад

Very, very interesting indeed!

@gavinevans4711 3 года назад

Another good video and article in the mag, Dan. I thought the findings were fascinating. I was also surprised that a Gori 175 with a 28mm and a modified Clubman could produce 17+ bhp.

@jamesmiller1667 2 года назад

Great video 👍

@johanakermyr1437 4 года назад

I haven't been into Lambrettas since mid 90's.

@norfolkscooterrides

Very interesting and very surprising! I used to match every kit I fitted, Vespa and Lambretta.

@christophersturgess4064 4 года назад

The last four RB 252 engines I’ve built and tuned are on standard casings and are no different in performance to the ones I did previously with enlarged casing transfers, both on the road and on the dyno with the same set up (all just over 40hp) and it’s difficult to find any difference. I always match the packer plates to the casing and then to the barrel as a matter of course. Instead of being over critical of the findings why not carry out the test and put the work in just like Darrell has. You can only verbally describe a road test and there can be a certain amount of bias involved, a back to back dyno test will visually show any loss or gain and at what revs so it’s the tool for the job. The experiment was done to show losses or gains and wasn’t a fuel economy test. Road testing is always important but this wasn’t to test the reliability, ride, feel and so on of a particular build it was to find any improvements with matching casings to transfer ports.

@kickbackgarage 4 года назад

Very intreasting!

@mikevega1097 3 года назад

I believe that DT would’ve been very thorough in his assessments and is being honest as to the results.

@thejoenelis 4 года назад

Great post this, very interesting..

@jameswade4761 4 года назад

Good info Dan .

@richardhenderson7819 4 года назад

Seems to be some questions raised about the integrity of the testing. I guess that's healthy debate and these things take time and experience to establish themselves. For my part, I trust DT so I'll be following his advice. Partly because I don't particularly enjoy matching 😁

@Avantone 4 года назад

Thanks Dan. I think the word folklore sums it up perfectly. For years people have asked questions on various forums (not just scooters) about tuning, and get the standard answers and opinions based on long held beliefs rather than objective testing. I’m so glad Darrell not only did this, but published it too. I recently completed a rebuild on a Puch motor that had previously had its transfer cutouts massively opened up. They were way wider than the new cylinder, and my gut feeling was to either open up the transfers to match, or weld up the cutouts. The owner didn’t want the expense of either so it was left with a massive step! Result? The motor ran really, really well...

@truthwarrior2431 2 года назад

Very interesting I’ve built probably around 50 different engines mallossi ts1 and rbs and remember my first build was a mallossi 210, never tuned it as I wasn’t confident at that time,after probably around 500 miles stripped it back down tuned and matched everything and it definitely made the engine run smoother but again couldn’t tell you regarding power as i never used Dynos back then , but wow I’ve been doing the same with every engine build since 🤷‍♂️🤭really gave me something to think about 🤔 thanks for the great context 👍

@sandymcintosh5717 4 года назад

maybe no one is reading the magazine anymore -- enjoyed this video and commentary!

@Dono1964 4 года назад

I remember when he first discussed this on your forum and got absolutely ripped to bits. He now produces the fastest and most reliable engines ever built for the Lambretta. The rest is history...

@stuieoldboy125 4 года назад

I did a similar thing on a smallframe vespa..parmakit sp09 rotary valve 28mm dellorto big bertha pipe. Built it without any port matching but did deck the gasket surface..went like shit of a shovel..had it in bits to put a short drt 4th gear in so decided to match the intake manifold and transfers so had extra alloy added round the transfers and set to with the burrs..looked lovely,didnt make a blind bit of difference out on the road...hours of time and a few quid for nothing.