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Alpinestars Oscar Monty Riding Shoe £169.99
Michael Neeves Four months/1500 miles These hand-finished Ce-certified riding boots are fresh from Alpinestars’ new Oscar range of retro protective clothing. Made from thick, vintage-effect, full-grain leather with a grippy, oil-resistant rubber sole, these boots are sturdy and comfortable, on and off a bike. And although they’re not billed as being waterproof, I’ve worn them in heavy rain a few times and my feet have stayed dry. It’s not a two-minute job to get them on, but that’s the price you pay for a sturdy boot. They’re not the cheapest either, but they’re well worth it. www.alpinestars.com
for several years the rim can “weld” itself to the tyre’s bead. When the tyre is removed it can leave small flakes on the wheel, leaving a surface prone to slow leaks.
If your cleanedup wheels haven’t ‘responded to treatment’ then I’d suggest looking for secondhand wheels in better condition, or having your rims powdercoated by a reputable company who would clean the bead area scrupulously before applying the coating.
If the valves are old they sometimes begin to leak, so should be replaced every time a new tyre is fitted. Even if yours are airtight but haven’t been changed for a while I’d replace them anyway. You never know when they could fail. My 2003 Aprilia Falco has given me good service over the years, but it’s started to smoke on start-up and I’m worried I’ve got valve guide wear or worn piston rings. Alex Saint, email
Answered by Mark Bowen, Bowen Moto Falcos and RSVS from that period were fitted with a vacuum-operated slipper clutch. There is a diaphragm as part of a sealed chamber behind the clutch cover which is connected by a sealed vacuum pipe and a one-way valve to the rear cylinder inlet tract. When you shut the throttle the drop in pressure in the inlet tract means the diaphragm works against the clutch springs to pull the plates apart slightly so they are able to slip if there is enough back torque from the rear wheel.
If that vacuum pipe splits it allows engine oil to be sucked into the inlet tract where it gets burnt off as a puff of smoke. The other weak point is the one-way valve, which can jam open and allow the clutch to slip under acceleration.
My 2010 Kawasaki ZX-6R has started dumping coolant from the overflow pipe. The fan was seized and there was a build-up of sludge in the coolant system. I replaced the fan and some pipes and flushed out the rad, but on the next ride it started dumping the new coolant and the temperature rose. When I turned the engine off it dumped the rest. David East, Minsterworth
Answered by Ken Stoppard, APW Motorcycles It all points to a leaking head gasket pressurising the system. Some oil in the coolant or emulsified engine oil are the usual signs it’s time to get the cylinder head off and check it. Hopefully the engine won’t have overheated enough to warp the cylinder head. I have to replace the upper visor seal on my Shark Evoline 3 helmet but I’ve been told some glues could damage the helmet. Which glue would be most suitable? Rob Marshall, email
Answered by Rich Stevens, Rich Art Some glues are a no-no and as your particular Shark model has a polycarbonate shell, extra care should be taken. A Cyanalitebased glue should be used in these circumstances, which Shark UK confirmed. However, your Evoline 3 can only be three years old at most, and Shark helmets carry a five-year manufacturer warranty that covers the visor seal, so I would return it to them to do the work for you.