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Post by privet125 on May 5, 2012 1:53:10 GMT
Hi Everyone, last November my dad bough me a PX125 03 plate with a sito exhaust. The scooter does around 100kmh (62mph) however i was wondering what would be the best way to increase the speed top end and have some more torque.
I was told that a 166 massoli kits with a 22tooth cosa 2 clutch, bigger exhaust, 65 teeth primary and bigger carb would do the job, however i was told that pollini do better more reliable kits.
also what exhaust would be better, a sito+ or a simonini ?
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Post by kru251 on May 5, 2012 20:10:21 GMT
Well normally top end power comes in at higher revs...................... at the expense of torque so Like most things with engines, the last 10% of power gain is an additional 90% of the grief/money factor.
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Post by privet125 on May 5, 2012 23:14:16 GMT
what would the best set up be gear wise ? more or less teeth on the clutch
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Post by kru251 on May 6, 2012 14:23:51 GMT
Are you trying to shorten the gearing increase the acceleration but with a top end loss of speed or lengthen the gearing to give better top-end speed at the cost of slower acceleration etc? The Americans have a saying that "You can't beat cubes". This refers to their engine's cubic capacity. More capacity (cc's) will give more HP. This is at a cost of more fuel consumption of course and stress on components. You're only running a little 'un. If you under gear the scooter it will get off the line well in the traffic light grand prix well, but you'll run out of 'go' at higher speeds and will be revving a lot more. Overgear it and you'll be slower off the line but will find that in ideal conditions (downhill with no wind or wind behind you) you can get a faster top speed. Unless you throw lots of money at it then you can't have both. I lowered the gearing on a V twin motorcycle and that gave much better acceleleration with a loss of top end ........................ but as it was 996cc with 102bhp & a 150mph plus top end speed it didn't matter too much!!! A friend runs a PX 125 with a racy chrome exhaust, but of which type it is I'm not sure. Altering the main jet size helped it but it still only reallyt holds fourth gear in those ideal conditions or along a straight. Uphills it goes much better flicked into third gear. Personally, I would really learn the scooter first in terms of what gear and when so your riding all flows smoothly. Get the feel of when you can just snick it down from fourth to third smoothly to keep revs optimum and your transit speed up etc. Banging the throttle open twist 'n' go fashion is just a waste of time/fuel/components as in wear. You'll progress MUCH faster with a smooth, developed riding style. If yours is already 100% then great. Mine isn't always...................and I've been on two wheels for 36 years! Oh, and by the way, is that 62mph on the scoots speedo or a sat nav's readout? There's normally a fair bit of difference in comparison with the over-optimistic Vespa speedometers!!!!!!
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Post by sbwnik on May 6, 2012 16:03:05 GMT
62 on a throttled 125? Hmmm... Vespa speedos are crap, aren't they? 55 would be closer.
If you want to go faster, then the first thing to learn is to corner quickly. The second thing to learn is braking points. The third thing is to learn to read what is happening around you. The fourth thing is to buy a P200 engine.....
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Post by kru251 on May 6, 2012 18:52:49 GMT
62 on a throttled 125? Hmmm... Vespa speedos are crap, aren't they? 55 would be closer. If you want to go faster, then the first thing to learn is to corner quickly. The second thing to learn is braking points. The third thing is to learn to read what is happening around you. The fourth thing is to buy a P200 engine..... We agree eh ? Smooth riding technique, disbelieve the speedo..................... with more cubes...... ;D
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Post by privet125 on May 6, 2012 20:53:50 GMT
i was looking for more speed topend, and to be able to hold a decent speed uphill if thats possible. yet again this is my first bike and my knowledge is next to nothing.
Im getting a malossi 166 in the next few weeks and putting on a p2 carb with a SIMONINI exhaust.
i just wanted to know if upgearing is worth it or should i just stick with the stock gearing. also what clutch would a px125 03 plate have?
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Post by sbwnik on May 6, 2012 21:24:28 GMT
I'd repeat what I said...
I'd put money on me being able to kick your arse on a standard P125 if you had a 166. Experience>engine.
Unless you're looking at a lot of motorway work, top speed is generally meaningless. Learning to ride well is much more important.
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Post by colin4255 on May 15, 2012 22:06:13 GMT
Here's my two cents. I bought a PX125 with a 180cc DR kit fitted. Not a racing kit, but supposedly better torque and maintaining its speed uphill, in wind etc. It ran faultlessly on the flat and would just top a true 60mph (like most say on here, unless you buy a 200cc engine, you an't going to get it to go any faster). In my case, slightest headwind or hill and it died in top. Found out why when we stripped it. Someone had fitted Px200 gearing to it. 65 tooth chritsmas tree, and 35 tooth 4th gear. Problem with this is it was overgeared (or is it undergeared - I can never remeber the right terminology!) . Good top end so long as it was flat and a still day. I have taken it back to nearer PX125 gearing, and while it tops out at 55-57 mph now, it holds its speed and doesn't die away at the slightest incline. Way better IMHO. You want 70mph then you will simply have to find a decent PX200 engine, keep it standard apart from an exhaust and some upjetting, but thats if you can find a good one. Rare as hens teeth and really expensive to buy or build from new. New, you are lookin g at about £1200 for the entire set of bits, or £1600 if you buy one already built.
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