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If it backfires immediately when you engage the clutch and release the throttle, you have a carburetion issue. Fuel mixture is too rich at idle. (If you have fuel injection, your controller is set too rich at idle.)
It would not really cause it. Back fire ( in the exhaust) are caused by:
- Fuelling to rich at low throttle. It could be the air screw setting, blocked air filter, wrong jet, floet level...
- Air leak on the exhaust (expecting you are using the standard system).
- If you are using a performance exhaust, try a baffle, a smaller pilot jet or playing with the air screw and idling screw. A slightly higher idling speed could cure it.
Tight valves could cause performance (especially when hot), difficulty to start and idle..'
Good luck, Franck
KICK HARDER TRY PULL STARTING IT..IN SECOND GEAR..DOES IT HAVE ENOUGH COMPRESSION TO START?IT SHOULD START PULLING IT...START OFF WITH NO THROTTLE THAN IF NOT STARTING CRACK THE THROTTLE SO LIGHTLY AND SHE SHOULD FIRE OFF WHILE IN GEAR BEING PULLED OF COURSE BE CARE FUL NOT TO RUN INTO. WHO EVERS PULLING YOU..USE A LONG TOW ROPE..IF YOUR NOT A SEASONDED RIDER AND KNOW YOUR BIKE VERY WELL I WOULD NOT ATTEMPT THE PULL START...IF NOT CHECK YOUR COMPRESSION AND TIMING..MAJOR VACUUM LEAK MAYBE AT BASE GASKET..IS ENGINE SUCKING TO MUCH AIR? GOOD LUCK..
I am assuming this is the injected model (i did not think they made them in 97), the most common problem of this scenario is the spark plug, if your plugs are ok than your injectors may require servicing, make sure you are getting fuel and your fuel filter is ok
You are running really lean. gas is not getting to the idle ports. try removing the idle mixture screw and shooting some carb cleaner in there. make sure you get all of the mixture screw parts out first. Reinstall screw and set to previous adjustment. you may have to back out the idle mixture screw a bit to allow it to idle properly. There is a very small idle mixture jet that may be clogged as well.
It sounds to me that your carbs might be a little gunked up - you mentioned the gas may have been old, so it's possible that the smaller (idle) jets are slightly plugged up. Fresh fuel might do the trick and/or you could try using a fuel system cleaner and water remover. This problem might 'solve itself' with a little time.
As far as the backfire - this might be either from the carb issue or it could be related to that rattle you mentioned - you could have a loose connection at or near the head - this can **** air and cause a backfire.
Your bike's engine is back firing ..this could be because of low level of fuel in the float chamber.
If you have cleaned the carbs , please recheck and reset the float chamber level.
Secondly both of the carburators have to work exactly at the same time..if they dont it will also kinda back fire and have uneven idling...check this too.
As for the air mixture screw .. once all is fine ....tighten the screw slowly all the way in to the last thn unscrew about 2 and half to 3 turns outwards .....you will notice the improvement of the idling.... its adivseable to check the valve clearance and reset them to specs.
Hope this helps!
These will backfire when you let off the throttle if the idle is set low. When set low enough to sound "right" you will get the backfire. Set the idle up a bit and you will lose the backfire but it will sound like it is idling a bit fast.