niek1992 wrote:

And in the process of servicing that engine you removed or even replaced the exhaust. The exhaust might be crudded shut or had similar exhaust paste like Bosal to seal in the gaps. The Exhaust Cement is one time use only and needs to be reapplied after you’ve done work any work on the moped which involves removing the exhaust. Rega…

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To Semmad post:

I drive 3% because of a new piston rings (i read some comments that suggest more lubrication during first circa 500 km). Before the full service i drove on a 2% 95 fuel mixture and everything was ok, no leaks.

I also read that to gain some power it is good to drill inlet to 13mm and get 13.13 carb. Maybe it has more sense with a…[Lees meer]

Ok, a lot of thanks for such a good explanation guys 😉 Now i know what to do. Regards.

I forgot to tell that i drive my mopeds mainly in the in summer and spring/autumn when it is quite warm (18+ degrees). And i stop a lot to see some landscapes. So leather pants would be too warm. I thought about motorcycle jeans; more ventilation and also safe, but could not find any that fit alright. What is more, my mopeds go up to 50 km/h, so…[Lees meer]

Ok, and how about a setup with 13mm inlet, 13.13 carb, bigger jet, giannelli original power and a standard 50cc? Would that be enough for 9:1 or do i have to get a bigger cylinder?

Okok, i get it now. I have a spare 10.7:1 gearing for this moped. I just read a lot of good opinions about Malossi 9:1 and was wondering if it would be ok for my setup. So 9:1 is only ok with a bigger cylinder? So top speed and acceleration with shorter gearing 11,5:1 will be lower than in 10,7:1?

Ok, what exactly does “too hard” mean? What would happen if i use 9:1 anyway in this setup? I would not accelerate good or reach as high top speed as with 10.7:1?

Hello, i think that you should:
– get better exhaust: sito + or gianelli original power
– get smaller carb 12/12 with 50-52-54 jet or drill the inlet to 13mm so you can use 13/13 carb

The brake can’t be too tight. It is the same as i was before, when moped was running faster. I did not replace the transmission. It is the same as before, original, single speed, non varieted transmission. I just cleaned it and changed the oil.

Ok, thanks for the answers. I drive a lot in light terrain/forest roads/road not paved so i need tires with deeper thread. But maybe there are some tires that allow higher speed on the roads and better grip in terrain.

Unfortunately I don’t know where did they came from. Si Mix is propably from the UK market.

No, the first Si isn’t Swiss postal mofa. It is standard Si.

I did search for production date on some parts. On Si the latest date was 95 on rims and brake handles. On Si Mix the latest date was 98 on rims and brake handles.

How to find year of…[Lees meer]

Ohh, ok, thanks for the information guys 😉 I’m from Poland so i use this forum with google translator. Sometimes it gets wrong. I tried to figure out snor and brom, mustache and hum, but got confused ;P Anyway, great forum and a lot of very usefull info.

Hello, sorry for binging up the topic. I was looking the forum all evening and couldn’t find the explanation of what exactly is mustache and hum. I did read somwhere that hum is an odltimer and mustache is standard. Is that right?

Is moped with standard cylinder, 12/12 carb, 11,5 intake, sito plus exhaust and 6 holes air filter mustache or hum?…[Lees meer]

Hello, I have two Piaggio Si; one is Si 45 km/h and the other is Si Mix 45 km/h. I can’t figure out the year of production. Can You help me decode their frame numbers? Is there some manual for decoding frame numbers or mopeds?

This is Si. Number is SIV1T 2404307. After reading this topic i assume it is from around 1992-1993. In the documentation…[Lees meer]