6 THINGS YOU NEED TO KNOW
These electronically cut the power to the engine for a fraction of a second, reducing the force on the gears and allowing you to shift up. But they can cause excess force on the dogs if the cut is too short (dogs are the teeth that hold the gears to each other) which causes rounding off and the bike jump out of gear.
Dog teeth v synchro 2
Both work in a similar way but car gearboxes use synchro hubs to change gear, where bike gearboxes use dog teeth. Car synchro hubs are heavy and take up a lot of space, dogs work well with a bike’s sequential gearbox, are lighter and easier to package.
Chain tension 3
Keeping your chain too tight will eventually damage the output shaft bearings leading to an engine rebuild. But a loose chain can make gear changes erratic. Changing gear without the clutch can damage the dogs like a badly set-up quickshifter. Crashing also damages gearboxes – when the rear wheel suddenly stops moving it sends massive forces back through the output shaft and into the gearbox.
Keep your chain correctly adjusted, and use the best recommended oil as gearboxes get extremely hot and are often poorly lubricated. Many engines have their breather in the gearbox, which can lead to corrosion from the toxic waste gases. Apart from that, most gearbox problems come from miss judged rider input.
5 Improve your gearshifts
Make sure your gear lever is adjusted for how you sit and your size of boots. This helps improve the positive change of gear. Keep the chain adjusted correctly and use the clutch to change gear.
False neutrals 6
This happens when the selector drum hasn’t rotated enough to engage a gear, which could be down to insufficient pressure on the lever or a weak detent spring on the selector star. These are often one of the few parts of a gearbox you can get to without stripping the entire engine, which is good news if your bike is afflicted.