Vespa - Sito and the extra ten

After speaking with another VBB owner I decided I would spend a little time and money to improve the performance of my Vespa. As I didn't want to invest too much money I bought a second hand (but unused) Sito PX exhaust off ebay. The original VBB exhaust was a very simple affair and didn't really add to the performance of the scooter. Sito built larger bore exhausts that improved the gas flow through the engine. While this doesn't substantially increase performance in the same way as a racing exhaust would, it does offer an improvement without requiring changes to the carburettor or jets.

The new Sito exhaust is in front, the old VBB exhaust is at rear

Replacing the original exhaust is a very simple affair and the steps are described in detail here so I won't repeat the instructions: http://www.scooterhelp.com/tuning/sito.exhaust.html

What I will say however is that it was a revealing exercise into the dodgy world of Asian scooter restorations. The exhaust itself came off quite easily but the bolt securing the exhaust to the frame was very difficult to remove. The restorers obviously did not have the correct size bolts to hand and so used a roofing bolt that was overlength and a little too thin. To make it fit they'd used about six washers of different sizes with bolts in front and behind the connection to keep it tight. They'd obviously installed the exhaust before the engine and swing arm were in the frame as they'd threaded it from front to back. This meant I couldn't extract without removing the whole engine as the bolt was butted up against the frame. Instead I chose the dodgy mechanic's method and just cut the through the bolt.

It is much easier to get at the securing bolts with the rear wheel off.

There were signs of poorly welded repairs around the bolt hole. Obviously someone had smashed the bolt (and exhaust) out of the swing arm and then re-welded the damaged hole so that a new bolt could be re-threaded. Nice.

Dodgy bodges. A roofing bolt, the wrong size, threaded through from the front through a hole that has obviously been hacked about and re-welded.

The Sito exhaust slipped on easily but I suddenly found that it was missing the securing bolt. This led to two trips to the hardware shop for new bolts as I made the mistake of assuming the new securing bolt would need to be approximately the same size as the old one. That was a wrong assumption as it turned it. The end result though is that the new securing bolt is much thicker and sturdier than the old one.

All in all, if it wasn't for the problems caused by the dodgy repairs, the whole job could have been completed in 15 minutes.

So, did it work? The first thing you notice is the Sito gives off a deeper tone than the tinny old exhaust. It did not really improve take off speed but as I worked up through the gears I found the old girl was able push on through past the 40, 50 and finally 60 kph barriers much easier than ever before. For a few minutes the needle even waivered towards an unheard of 70 kph so from my perspective this has been a very significant improvement.

Scootering ups and downs

It's been a challenging couple of weeks on the scooter front. After the Troll's poor showing on the Piaggio run I went over the carby, flushed the fuel system and installed a new petrol tap. The result was almost immediate and the Troll ran like a dream again. I took it on a couple of rides around Fremantle and around the river and actually began to think that everything was looking good. It wasn't too be though.

On the last Sunday of 2009 I joined an early morning ride organised by a couple of guys I used to work with. They were riding a Vespa PX and a Lambretta. It was a long route that took us from Fremantle, along Canning Highway into the city (the long by slow road), through to Kings Park overlooking the city and then down to the coast, turning south back to Fremantle and then along the river to Como. As it was starting early, I was running late. I missed the first rendevous at the Lucky Shag bar, then missed the second rendevous at Kings Park but was only about five minutes behind the pack. I headed straight for the coast aiming to cut them off at the pass but missed them again (little did I know I had actually overtaken them). But I didn't really mind. The Troll was running really well; the engine never skipped a beat, and I was enjoying myself immensely. After about an hour and half on the road I eventually reached Fremantle again and then, just as I pulled into the carpark outside Little Creatures brewery, the engine died. The others all then arrived, just in time to see me stalled at the side of the road. A couple of guys tried to give me a push start but she just wouldn't go. I walked her into the carpark. It was a stinking hot day and the consensus was vapor lock so we settled in, had a beer and waited.

Sean's Lambretta

The waiting didn't do me any good though. The Troll resolutely refused to start. When the kickstarter broke it was kind of game over. I bid adieu to the guys and began pushing the Troll home. It was a hot day - 40c - and it took me 75 minutes to get her home. My enthusiasm for scooters was sorely tested that day. So the Troll is now out of action until I get the kickstart looked it.

So it was back to the Vespa again! Actually the Vespa has been very good to me. I hadn't used in so long that I'd forgotten what a pleasure it is to ride. Even after months without use it still turned over on the second or third kick. Over the past couple of weeks the Vespa has taken a bit of hammering. Then, I was riding it back from the hardware store last week when the back end went all soft on me and I started sliding all over the road. The rear tyre had blown. I was lucky to bring her safely to a stop, not least because it had been a very hot day and 'I'm only going up the shops' I was wearing only a T-shirt and shorts. Coming off would not have been pretty. So, again I ended up pushing a scooter. Fortunately I was only about 500metres from home.

This was the first tyre I've had to change on any of the bikes and I must say it was much easier than I had expected. Five bolts hold the tyre and rim to the wheel, which slips off easily. The spare simply bolts into place. It took only fifteen minutes. Here's a couple of shots of the patient.

Lie still, this won't hurt a bit!

One comes off, the other goes on.

I've so enjoyed riding the Vespa lately that I've decided to make a few minor mods to improve her performance. I'll shortly be installing a Sito exhaust which should give her an extra couple of kilometres per hour. We'll see. I don't believe my speedo is anything like reliable. It barely registers 40kph when I'm hurtling along Canning Highway (speed limit 60kph) and cars aren't overtaking ... all the time. We will see.....