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Check the vacuum pipe from the inlet manifold to the fuel tap. It may be leaking air in and not allowing fuel to flow properly. Also weak reed...
Soak it in a weak solution of Citric Acid. That will etch away the oxidation. Then metal polish and clear-coat lacquer it, to prevent it from...
Does the bike have an immobiliser fitted (flashing LED on the dash)? If so the immobiliser could be faulty. If it fails to register the encoded...
Check the plug colour. You want a mid to dark brown colour. If the needle on the throttle slide has more than one groove, move the circlip up one...
Bigger bore kits normally need a larger carburettor and larger carbs usually have smaller jets. The fuel/air mix may be too rich and the...
You may have burned the new piston rings out from lack of oil, broken a piston ring or scored the bore. You need to take it apart and look at the...
You may need to go up one size of the main in jet the carb as a result of the bigger bore kit. I'd also recommend adding 1 or 2% 2T oil to the...
I'd replace the whole lot. That will get the bike running then you can work on the old head. Those pictures show severe burn-through of the gasket...
That's my thoughts - overheat - head warped - causes burn-through on the head gasket.
If they are all failing in exactly the same place, then the head is most likely warped and where they keep failing is where the warpage is. Most...
Chances are that you've scored the barrel, or knackered the piston rings. It sounds as if you've lost some compression and you won't know for...
Go for the cabled manual choke, as the flick lever type can be awkward to get at behind the plastic panels.
With the carb upside down and the float bowl removed blow down the fuel pipe and check that the needle valve cuts off the air just as the flot top...
OK, you need to try this. get a sheet of glass and some fine wet and dry silicon carbide gritpaper. Lightly oil the gritpaper withsomething like...
I know that some AY50 Katanas had Morini engines and some had Aprilia engines. The Aprilia version had a belt driven water pump IIRC that looked...
Check the cable to see if it works smoothly. If part of the cable has frayed inside, it might be binding. For peace of mind I would replace it, as...
if the immobiliser has gone bad, it will start, but it won't rev over 2000rpm. Do you have the red master key that came with your bike? If so, you...
Your radiator will be above the cylinder head so I would remove the thermostat and fill the cylinder side from there. Once that is full, then move...
It's likely to be the top bearing (the one that the piston pin runs through) rattling and causing a bit of piston slap. They don't take kindly to...
If they are M6 threaded bolts for the cylinder heads (most scooters are) I'd aim for about 15Nm (about 10 lb ft).
