Since scooters don't usually have catalytic converters like cars do, running the engine lean is one way to keep CO and HC exhuast emissions under control. Nitrogen Oxide (NOX) exhaust emissions are higher if the mixture is lean though, so it's a tricky balance. Second, exhaust emissions (CO and HC) are lower if the engine runs slightly lean (less fuel in the fuel/air mixture) than slightly rich (more fuel in the fuel/air mixture). Manufacturers tend to use the smallest possible main jet for two reasons. Does the kickstart and sector gears need to be removed to take off the transmission cover? The manual states the sector gear is spring load, so I prefer not to mess with it if I don't have to. Secondly, I'm trying to remove the transmission cover. My question is does the fuel/air filter need to be adjusted once the jet is changed. The main restriction on the 50 cc four stroke engine is electronic. The restriction is the same on all 50cc four stroke models including the LX 50 4t, Fly 50 4t Remove the spacer washer between the front pulley halves. Make a 3mm deep cut with a hacksaw in the position shown. From the manual from Piaggio (UK) published in 2006, it states 3 things are requiredġ. Once i finished fixing up all the bikes at the shop i'll be fitting a revised ported cilinder (54cc), new CF reeds plus taller gear (16 x 42) to make it go 100+kmh at the straights on a small go kart track, so far the best my Dio has done is 90 kmh on stock gears using the lousy Malossi pulley which has very little overdrive, i'll also going to modify the pulley tracks to get more overdrive, it's a shame to replace this piece of hardware so i'll make the most out of it.Not sure, but I think it might vary depending on year of scooter etc. it a challenge to make a Dio go fast even with a lot of aftermarket parts it's still no match for the Jog on a drag race so that's why i own a Dio scooter to make it go just as fast as the Jog (hopefully). I think the Dio peaks out at 11,000 rpm 'coz i want to make it more reliable for the owner to enjoy it, of course it can go to 110kmh if we fitted a stroker crank, race porting but the motor won't last long on the street (piston & ring wear). a full race Jog 54.7cc with stroker crank, 25mm carbs, race porting & 41.5mm piston can run 125 kmh on the drags but reliability is an issue when it's used for the street. Honda Dio scooters (vertical) are not rev monsters like those of the Yamaha Jog which has a bigger bore & a shorter stroke (40mm x 39.2mm) than the Dio (39mm x 41.4mm) so 105kmh possible on road set-up(Dio), i also tuned my rider's Jog and it went a respectable 115kmh with porting, Multivar, Malossi torque drive, 14 x 34 gear up kit, racing CDI, Polini reedblock, 4N race pipe & 21mm Dellorto carbs.
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