ANY QUESTION ANSWERED
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Q How can I stop getting hot & bothered?
My Kawasaki ZX-10R is overheating below 40mph. Yesterday I noticed a coolant leak, but it turned out a clamp on the radiator hose had come loose. Problem solved, or so I thought. When I took the bike out today it was fine above 40mph, but anything lower and the temperature would creep higher and higher. Although the fan spins freely, it doesn’t seem to be coming on. John Davidson, email
A Chris Dabbs, MCN There is a simple series of checks on the coolant system of any bike. Start by checking that the fuse for the fan circuit hasn’t blown and there’s sufficient coolant in the system. Run the engine at a standstill until it’s warm and see if the fan kicks in. If it doesn’t, this could be because the fan switch is faulty or that the coolant isn’t circulating properly. Stop the motor, and wearing a heavy glove with some waste cloth wrapped around the radiator cap, carefully crack the cap open to release any pressure. Remove it, start the engine and see if the coolant is flowing properly. If the top hose is still cool it could be that the thermostat is sticking closed, or that you have an airlock somewhere. If that’s the case you need to drain the system, check the thermostat opens and closes and then refill the system. If everything checks out it’s possible the water pump could be getting lazy, either through crud on the impeller blades or bearings getting worn. If you take it out to check, replace it carefully as it mates with a gearbox shaft through a ‘fork’ connection and if you force it you could break the fork.
Q Why has my my Q little Bandit gone banzai?
My Suzuki GSF1250 Bandit runs fine when it’s cold, but when it gets warm the throttle response starts to get jerky in second or third gear. Any ideas? Keith Henderson, email Gareth Hall, Redcar Motorcycles A faulty gear position sensor A may be fooling the ECU into using the wrong fuelling map. If the neutral light comes on when the bike is in gear, that’s another symptom. It is not uncommon for the sensor to fail, and a new one costs £79.78. It is mounted behind the sprocket cover and is something a competent home mechanic could easily tackle, or expect to pay one hour’s labour at a dealer.
I need a quick Q fix for my Monsterõs speedo
The speedo on my Ducati Monster 1100 lags up to 70mph, then refuses to go higher. While overhauling the forks I changed the speedo cable, but saw no improvement. Have I compromised the speedo drive in the fork service, or has the speedo suffered in an oil-bath? John Marshall, email
A Neil Barrett, Cornerspeed Ducati As you’ve already replaced the cable, check the drive in the front wheel. If it’s become gummed up that will place a drag on the system. Also check the securing tang is in the right place. You can get oil contamination in the clocks, but it normally results in the speedo reading fast, so look at the
front wheel first.
Q Is there any way to fix my fuelling issue?
I have a 2014 Honda CB650F, and while it’s generally good I’m not happy with the fuelling at small throttle openings. When pulling away I’m either giving it too little throttle or too much, there’s no happy medium. What’s causing this? Ken Williams, Gwent
A Chris Dabbs, MCN Hondas have an emissions control device called PAIR, which bleeds air into the exhaust to burn any unused fuel. On some bikes it has been known to cause a flatspot around 4000rpm, especially on a light throttle. You can get hold of aftermarket blanking kits online for about £25.
Overheating ZX-10R could be caused by a sticky thermostat