Modern Vespa

Hi i have just ordered exhaust Tecnigas Q-Tre for my vespa lx 50 2t
Can anyone advise what re jetting ill be needing to do please
As i want to get some in before fitting the Exhaust thx in advance

Nothing personal, but if you're riding a 50 the small difference getting the jetting just right may not contribute too much to the overall ride. I'd only consider it if it's riding rough with the new pipe (whatever that one is).

As always, smarter people (or OCD nerds) may be able to correct me.

cool thx
just i was told if its revving to high it could cause trouble

Hi, i have tuned the hiper2 engine as fitted in your scoot with success (69 cc nitroed monster £6,000 spent on engine development and build alone) over the years.
Every scooter is different, two same scooters with the same mods may have different jetting requirements,
It is usually the rollers need fine tuning when a free flowing expansion chamber is fitted (lighter), the jetting WILL most defiantly need up jetting if the new exhaust has no kat as piaggio send them from the factory lean for emissions,
On your scooter there is a rubber snorkel in the airbox this is a restriction,remove this there is also a brass plate in the carb bellmouth this is NOT a restriction but a defuser to create turbulence and swirl to mix the autolube oil intake with the fuel thoroughly.
The 2t you have comes with a 56/58 main, if you remove the restriction and have fitted a new exhaust without kat i would suggest fitting a new72 main and then keep going up in size 74,76 78,80,82 etc until the scooter runs poor (not quite as crisp as the previous jet) wot, then go back one size, as this is the correct jet for your set up.
Cheers Andy

Thanks Andy
Few Qs where is the rubber snorkel mate
Also I have only just removed the brass plate?
Do you suggest I put this back thanks
Is the snorkel this pic I found online or not thanks again

Hi buddy,
Put the brass plate back in,one open up the airbox remove the filter and look into the top left hand corner, that's where the airbox restriction is.
The picture you posted is an intake fanny mould,
Cheers Andy.

Thanks Andy will have a look when I get home thanks again will let you know

What did I miss?

The new windows 10 update is shirt, and keeps sucking auto correcting

Hi Andy is this what you was talking about ? If so how do I remove it thx

https://www.google.com/imgres?imgurl=http%3A%2F%2Fwww.pedparts.co.uk%2Fc%2Fproducts%2FRAW%2FAirbox_Pipe_Snorkel_-_Minarelli_Aerox.jpg&imgrefurl=http%3A%2F%2Fwww.pedparts.co.uk%2Fproduct%2F3406%2Fairbox-pipe-snorkel--minarelli-aerox&docid=bExSBeHcLXfz4M&tbnid=PW6mLjYTiyYndM%3A&w=1024&h=540&client=firefox-b&bih=528&biw=980&ved=0ahUKEwj0356QyfPNAhWKVSwKHR59B6UQMwghKAMwAw&iact=mrc&uact=8
Follow the link this is what your looking for.
Cheers Andy

Ok Andy thx
I think the first pic I sent is the other side of it that goes to those pic
Is this what I need to remove thx

Delorto 17,5 carb, remove air restircter in carb main jet 65
Dont remove the snorkel in the air filter bokx, only if you gonna go for bigger cylinder kits

YES,

Ok Andy thx what will this do then if removed
What about what the previous post has said "not to remove it"
Thx

Well that's how much you know , the brass plate is not a restriction, clue if you measure the holes it equates to 25mm air volume, the carb is 17.5mm air volume,
That plate is for turbulence and swirl to help thoroughly mix the 2t oil.
Now go measure that snorkel it's letting'13mm worth of air into the airbox,the carb can handle 17.5 mm worth of air.
Go figure genius
Cheers Andy

Nice one Andy
OK so I'll take it out then
What difference will this make Andy thx

There are many hundreds of people who have asked for my advice when it comes to tuning, there is hardly a day that passes without someone pm ing me for advice,
I have NEVER had negative feedback from what i post.
It's your scooter and up to you to decide, but please feel free to check all my previous posts.
Cheers Andy

Thx Andy
I'll follow you thx if that's ok
So will it help run better in any way thx

Only take it out if you are up jetting NOW because running the scooter lean for a few miles WILL seize the engine.

Taking it out,

more fuel (bigger jet), more air (restriction removed) = MORE POWER

Cheers Andy

What do tou mean?

Have used that set up with standard 17.5 carb removing the brass plate and leovince touring exhaust on many scooters, worked very good, but with different exhaust wil need different set up.

Thats a detailed response right there...Andy, Come tune my scoot I need some proper jetting too!

Just because it "works" doesn't mean it's running to its optimized output, with that brass plate removed and the airflow restriction snorkel left in place you are slowing the airflow speed into the engine quite considerably,
This in turn does not allow the engine2t injection oil to mix properly so you ARE slowly killing the engine through excessive premature wear.
If you are not qualified to identify what parts within an engine do please don't give your misguided opinions to others who may listen to you and also slowly kill there engine.
Cheers Andy

I wil test your set up se how that works but what main jet do you use? Or Recomend? Have driven a gilera runner with the set up for 52000km befor changing piston and crank and is now at 83somthing000km, so it sworked very good for mine experiance, but gonna test what you do on my other engine 😀

But with your set up, u remove the snorkel an keep the brass in the carb and change main? Any other tips or trick?

Best wilhelm

Rather you then me, you deserve some kind of endurance award

Set your main jet the way i have already posted above, no two scoots are exact so i cannot recommend a particular size.
Cheers Andy
Ps this is only when the dellorto 17.5 mm carb is fitted, for best results a dellorto 19mm carb should be fitted , without the brass ring and without the restrictive snorkel the 19mm is by far superior in its finesse of power delivery and responsive throttle control.

Hi any help please!!
ok so my new exhaust has landed, i have removed the snorkle inside the pipe,
1st i have a gasket with the new exhaust do i need any gasket sealant?
And which way do i fit the gasket if its to be fitted thx as its different on both sides
also inside there is some lint kinda looking stuff do i leave that or remove thx
ive sent some pics too thx in advance Carl

Reply to your PM sent
ANDY

hi again mate
i have fitted all the new exhasut and have also changed to a 72 main jet as you said to start with,
Ok one thing how will i know if its running ok or not? or is it just trying bigger jets till its rough, and then drop back one? How do i look out for rough signs, or will i know thx
And will it be ok to run for two journeys ie 28 mile round trip, before i change the jet. (Going home then back to work on nights see) as i have to drain the fuel out before changing the jet.
Easier to do in work than the short time at home thx
sorry it late im on nights if you could reply when you get this thx

Hi Carl,
I have replied to your pm,
but for the other folks following this thread i will answer here,
If i were you i would make sure the correct jet is fitted before going on any long trips, the 72 you have fitted is a good benchmark to start from, however there is a good chance that it is too lean and you should carry out the jeting procedure as descried above,
With practice you will have changing the jet down to a couple of minutes a la gp style.
Your butt dyno will tell you instantly the moment you have fitted the jet that is too high.
Cheers Andy

Thx m8
The exhaust has wrecked the rear side panel though and I will show some pics later as the moving of the suspension with the pipe so high?
OK it seemed to pull away at first ok then struggle a bit but then go like a rocket is that the jet? Or maybe the rollers?
Thx Andy

Hi Carl,You can you please stop pming me then re posting the same questions, when a pm comes in i have no way of knowing who sent it so i have to keep signing in to find out who and what it's from /about.
Cheers Andy

Sorry m8

Soz Andy my PMs were showing still in my outbox and not sent
Won't happen again