please, Please, PLEASE Help !
I just recently bought a 1991 Suzuki GSXR750 (Water Cooled), and have just had it for over 1 week now.
Anyway, A couple of days ago, the thing started missing on the way home from work, and by the time I got home (10 minutes after it started missing), One of the cylinders stopped firing completely.
The Bike still idles, but unfortunately with only 3 cyls, it just doesnt have any torque. (wont go anywhere)
O.K. For a bit of background on the bike, (From what I can tell).
Its using stock Mikuni Carbs (4x - I think they are SU's, not sure though). These carbs have been rejetted, a K&N Air Filter has been fitted, and a staintune Carbon Fibre Muffler has also been fitted.
As for Rejetting of the carbs, I dont think that it was tuned properly, as the spark plugs were replaced the day that I picked up the Bike (I saw them do this), and only after 400Km, they are as black as black.
Anyway, First thing I checked was ignition, by pulling each plug off, to see if the engine died. Engine died on all 3 cylinders except cyl 4, so I am assuiming that the problem is with Cyl 4.
I changed all the spark plugs with new ones (Just in case), and tried the test again.
Same symptoms as above.
Took off the Ignition lead for cyl 4, and checked it with a new plug, outside of the engine, and could not see any spark.
Tried grounding the lead to the chassis, and there was a very weak intermittant spark.
I then went to replace the ignition lead (With motorbikes, they use solid copper Ignition leads, with suppressed boots), So I bought myself some Ignition wire, and a new NGK Boot, and made myself a new lead.
The cylinder still doesnt want to fire, and with the new plug on the lead, outside of the engine, there is still no spark. BUT grounding the ignition wire to the chassis, there definitely is a stronger spark, and it is no longer intermittant.
The Suzuki has 2 coil packs, and they operate in a very similar arrangement to the EF/AU Triple Coil pack, in the way that 2 opposing cyls share the one coil pack. I am assuming that the Coil pack is OK, as Cyl 1 (The cyl that shares the same coil pack with Cyl 4), is running perfectly.
With all the above F!@#$ing around, the engine isnt running any better than before (still only 3 cyls firing, and cyl 4 does not even backfire, or intermittantly fire), so I am now assuming that maybe its a fuel problem ?????
Does anyone have ANY idea's ?????
Or alternatively does anyone know of any motorcyle mechanics in Sydney, or know of any motorcyle forums that could help, or know where I can purchase a gun with a bullet that I can put through my head ?????
Please help, as I am absolutely desperate !
Cheers
Matti
I just recently bought a 1991 Suzuki GSXR750 (Water Cooled), and have just had it for over 1 week now.
Anyway, A couple of days ago, the thing started missing on the way home from work, and by the time I got home (10 minutes after it started missing), One of the cylinders stopped firing completely.
The Bike still idles, but unfortunately with only 3 cyls, it just doesnt have any torque. (wont go anywhere)
O.K. For a bit of background on the bike, (From what I can tell).
Its using stock Mikuni Carbs (4x - I think they are SU's, not sure though). These carbs have been rejetted, a K&N Air Filter has been fitted, and a staintune Carbon Fibre Muffler has also been fitted.
As for Rejetting of the carbs, I dont think that it was tuned properly, as the spark plugs were replaced the day that I picked up the Bike (I saw them do this), and only after 400Km, they are as black as black.
Anyway, First thing I checked was ignition, by pulling each plug off, to see if the engine died. Engine died on all 3 cylinders except cyl 4, so I am assuiming that the problem is with Cyl 4.
I changed all the spark plugs with new ones (Just in case), and tried the test again.
Same symptoms as above.
Took off the Ignition lead for cyl 4, and checked it with a new plug, outside of the engine, and could not see any spark.
Tried grounding the lead to the chassis, and there was a very weak intermittant spark.
I then went to replace the ignition lead (With motorbikes, they use solid copper Ignition leads, with suppressed boots), So I bought myself some Ignition wire, and a new NGK Boot, and made myself a new lead.
The cylinder still doesnt want to fire, and with the new plug on the lead, outside of the engine, there is still no spark. BUT grounding the ignition wire to the chassis, there definitely is a stronger spark, and it is no longer intermittant.
The Suzuki has 2 coil packs, and they operate in a very similar arrangement to the EF/AU Triple Coil pack, in the way that 2 opposing cyls share the one coil pack. I am assuming that the Coil pack is OK, as Cyl 1 (The cyl that shares the same coil pack with Cyl 4), is running perfectly.
With all the above F!@#$ing around, the engine isnt running any better than before (still only 3 cyls firing, and cyl 4 does not even backfire, or intermittantly fire), so I am now assuming that maybe its a fuel problem ?????
Does anyone have ANY idea's ?????
Or alternatively does anyone know of any motorcyle mechanics in Sydney, or know of any motorcyle forums that could help, or know where I can purchase a gun with a bullet that I can put through my head ?????
Please help, as I am absolutely desperate !
Cheers
Matti