Modern Vespa

hello guys...i need your advice please. I have vespa sprint veloce 1978 with 3 ports. I did cdi conversion on my sprint already. I planning to buy malossi 166 kit to replace my stock cylinder kit. Also i planning to buy 24-24 carb and sip road xl exhaust.

My question is..is that ok if i put malossi 166 kit without crank case modification? i mean porting ( correct me if i'm wrong)? I do not want any modification on my crank case.. i love to leave it in stock. i'm not a speed crazy person, i just want a better upgrade on my sprint like better acceleration, torque.

Thanks a lot

Hello and welcome to the forum. Yes, you can bolt the Malossi kit right on to your Veloce without doing any modifications to the crankcase. The transfers on the Malossi are quite a bit larger than the transfers on your 3-port engine, so you won't be getting the full potential of the kit unless you match the ports. But leaving the case stock is a good thing IMO, and you will still be gaining quite a bit of extra power.

How about some pics of your scoot? We love Veloces. Cheers!

I would skip the malossi 166
http://www.scooterlab.uk/on-the-dyno-new-bgm-177-cc-vespa-kit-retro-component-news/

If you're not going to port the cases, just put a DR on it. Cheaper and the extra displacement will give you the torque (broad power band) that you're really looking for.

I have a malossi 166cc on my PX150 and I didn't ported the cases, it bolts on just fine. I totally understand that you might benefit from opening the engine cases ports but not worth in my opinion if you just want to ride.

I also have a 24mm or 26mm(I have to re-check my set up) but the carburator made no difference in riding at all. I am making the same top speed as before.

Even though I haven't had absolutely not a single issue with my malossi for 2300 miles of full throtle(no break-in either) I wouldn't recommend the Malossi. It has no punch! The polini 177 that I had on my Stella had plenty of torque.

I would seriously look into DR, polini or the BGM(not sure about the Pinasco). Not that I don't like malossi but simply put I am not impressed with the 166cc kit although Ironically I have two other scooters running malossi 210cc (one of them is a Sprint Veloce by the way).

Malossi 166 is revvy. Better kits out there now.

Thanks a lot for all your advices...i'm considering dr 177 and bgm 177. Any information or experience on Dr 177 kit and BGM 177 kit in stock crankcase? are they reliable cylinder? thank you

this is my poor sprint veloce

Beautiful sprint. It deserves a new BGM 177

And the BGM deserves to have the cases matched. Agree with others, if you are not going to port the cases, go with the DR

Since you're considering other kits now, I'll throw in my vote for either the BGM or Polini.

We've got Polinis on two engines identical to yours. They're beautiful kits, nicely made, solid, quiet, unfussy, and lots of torque right out of the box. No experience with the BGM but it looks great. More dough and probably better suited to a higher-end build than you're planning.

Gorgeous bike btw.

I have a DR 177 on a Sprint Veloce and the power over stock is nice for climbing hills with it's nice broad power band. I think I gained 5 mph on my top speed? Although, these kits are described as "junk" for a reason. The casting on mine was very rough and all the tolerances (squish, ring gap) are on the larger side. The DR's are notoriously noisy, maybe because of this looseness? I guess reliability is build into DR's since they are so loose to start with. DR's are really barely a performance kit. They are based on old technology but it has worked for my riding style.

I initially suggested the DR for those exact reasons. It's cheap, has a broad power band, and is nearly a bolt-on match to standard ports.

I also found that I got a little more than 5 mph of increased top end stock as a bolt-on replacement, but I loved the broad power band. When I went crazy porting it & the cases along with a massive reed block and SIP Road exhaust, I was able to get 16hp out of it and it was a great highway-capable (run steady at 65-70 mph) touring setup.

I recently put a Malossi 166 on that motor and while I still need to get the tuning dialed in, thus far I'm rather underwhelmed by its performance, mostly due to the relatively narrow power band. It's great once you get it into the band, but even with a flytech ignition, it's still weak down low.

As it is, I'm seriously pondering picking up a BGM 177 and possibly a 60mm crank, but will hold off until I'm certain that I've got the Malossi running optimally before I give up on it and take that step.

5 MPH increase is very weak. My speedometer(original Piaggio from the 05 PX) indicates 11 mph error as per my GPS however I would tell you that when I firt got the PX 150 with just the sito plus it would do an indicated 58mph(subtact about 10-11 mph) but now with the Malossi 166cc it would do over 70mph indicated(75 tucked)...

The malossi allowed me to pick a solid 15+ MPH on the top end however I think that is a weak kit(as I mentioned over the years over and over)

My Sprint Veloce has a different logo, mine actually says Sprint Veloce and the logo is in an angle. Changing the subject, your scooter is astonishingly beautiful. I think that you should absolutely put the BGM. The condition of your scooter deserves the cherry on the top of the cake with the BGM kit.

i thank you again for all your reply comment, guys..what do you think about these 2 options:

1st: dr177 with stock crankcase, 24/24 carb, sip road xl or bgm big box

2nd: bgm 177 with stock crankcase, 24/24 carb, sip road xl or bgm big box

BGM 177 is more expensive than malossi 166 and polini 177

i highly appreciated all your advice

Option 2 and be done. Yeah more expensive, but it's a higher quality and technologically advanced kit.

Although I'd go with a chamber for better power.

If money is not an issue, get the BGM for maximum potential. For that matter, buy two and then send the second one to me.

If you're looking for value for money, go with the DR.

Either way, you will not go wrong.

BGM all the way.

I didn't realize the very discussion I was trying to start was in full force over here.

Glad to hear the DR gets good marks from you guys. I want a workhorse kit for my PX150 reno project and this sounds like it.

Is there much difference moving to a 24/24 carb, or can I save the cash and keep the 20/20 with the Sito+/SIP Road 2? I will definitely be drilling the air filter.

I ran the same speeds with the 20/20, 24/24 and 26 on my PX with 166cc Malossi and a sito plus. The carburetor made no difference on top speed and the acceleration was not noticeably better.