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Well, yes and no is the answer. Obviously they don’t make huge differences either way, but you should wait until the time is right to fit one. The standard Air box is setup to work perfectly with your standard engine and exhaust so doesn’t need changing for a Malossi open filter. Adding a Giannelli race pipe makes the engine more efficient (throwing extra fuel make into the cylinder that’s normally lost out the exhaust) and also rev higher, so it is using slightly more air, but not enough to warrant changing the to a Malossi filter yet. Adding a Malossi 70cc kit however, and things change; there is a 40% capacity increase there, so it’s obviously going to benefit from the greater airflow the Malossi air filter gives. Does it make a big difference though? No, not really. It’ll improve the low down punch more than anything, but not real differences apart from it sounding better ;-) The important thing to remember is to UPJET when fitting one; otherwise it’ll run lean and cause a seizure. I normally go up by 6 sizes or so depending on the model, and don’t fit one until I’ve got a Giannelli exhaust ...

A question that's been asked and searched for a fair bit recently, so I thought I'd post the answer The pistons in all cylinder kits, not just Malossi 70cc big bore kits, have a little arrow on the top of the piston. This arrow faces the exhaust port, so it is generally facing down on horiztonal engines and towards the front of the bike on vertical engines. Fitting the piston the right way round on big bore cylinder kits is extremely important, since the big bore piston rings arn't complete (they need to split to squeeze over the piston), they have a point in the piston there the two ends meet. These two ends generally line up between the middle and outer transfer (intake) ports on the rear of the cylinder providing you have fitted the piston in the right way round.  Fitting the piston backwards on a big bore cylinder kit will result in these two ends opening up slightly in the exhaust port and possibly catching.  As well as this a lot of pistons have a cut away piece for helping intake induction on a certain side, and sometimes are cast / machined to take more pressue on the exhaust / thrust ...

So, you’ve bought a race pipe, you’ve bought a big bore kit, big carb, Malossi over range kit, K&N air filter, new crank, anything and everything to boost your scooters engine performance, yet someone rides around the outside of you on a simple derestricted moped?! How can they do this? Straight lines aren’t everything, if you even watch racing, they never say how they spent the entire race weekend doing further tuning to the engine performance, no, they always say how they’ve spent every session optimising the suspension settings, the brakes and the tyres! This is how the 125cc bikes in racing can lap only a few seconds off the highly tuned performance superbikes, they’re lighter and handle better, even though they make less than half the power! The best part to this is, you can do two out of these three steps for very little money, it’s cheap as chips! 1. Tyres So, you’ve spent thousands tuning your scooter, it has every modification possible done to the tiny little engine revving its nuts off, and you’re doing over 70mph on a tyre contact patch the size of two fingers? Doesn’t sound very safe does it? So why do most people skimp out when it ...