Quote:
Originally Posted by Annie XT600
Fuel is getting to the carbs and into the engine, however the 2nd side of the carbs is getting more fuel than the 1st........
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This could be the problem. The second carb (assuming this is the usual dual carb YDIS set-up) should be getting none at all with the throttle closed.
Quote:
Originally Posted by Annie XT600
Might sound like a silly question but how would I test the compression??
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Borrow or buy a compression tester, and make sure you get one suitable for motorbikes (much smaller plug diameter than a car). Unscrew spark plug, screw tester into cylinder, ignition OFF, fuel OFF, throttle wide open, and kick the kicker like buggery until you get a steady reading from the gauge. This usually takes several turns of the engine.
The figure you are looking for will be 14.7 times your compression ratio, so if it's 8:1, you are looking at an ideal compression of 8 x 14.7 = 118 psi. Generally speaking, if your figure is within 10% of this, the bike will run OK, so anything over 105 should start and run fine. (On a multi-cylinder engine, the cylinders should also all be within 10% of each other.) Below 105 psi, your engine is looking very tired and will be either a pig to start, run badly, or lack power - or all three.
I'd have those carbs off again and see if the float valve on the big one is stuck open.
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