k3lv Posted April 16, 2024 Posted April 16, 2024 Hi folks hope all is well , so 99 gsxr 750 was running great only issue was it smelt really really rich , anyway leant the bike to a friend for a bit and in return he gave me an original 750 end can which he put on , so he went to ride out today and it wouldn't start ....when it did it sounded like it was on 1 cylinder and now it just backfires really really loud ....I'm stumped as when I dropped it off it ran really well Quote
RideWithStyles Posted April 16, 2024 Posted April 16, 2024 (edited) 99 Edited May 14, 2024 by RideWithStyles Quote
Tinkicker Posted April 16, 2024 Posted April 16, 2024 Maybe the new exhaust is blocked with rust? Quote
k3lv Posted April 17, 2024 Author Posted April 17, 2024 11 hours ago, RideWithStyles said: 99 is injection not carbs so not much concern there. what other mods have been done? air filter, ecu, jet kit? what did it have on before your friend put the original one on? if it was rich then with a straight through, if he did everything correct without going for a razz (breaking something?) then all the original one would do would slow the gasses, have a bit of back pressure and maybe smell a bit less but wouldnt be on 1 cyl. the back fire is where fuel is passing the cylinder (not being burnt) and into the manifold or worst further down the exhaust. i would be checking the ignition system, which coils and sparks working and fault find backwards. Got a bit more info so he went to change the plugs for me with it smelling rich but didn't have a socket small enough ...so he removed the air box,and the 2nd coil realised his socket won't fit and put it back together....from what I've seen on video call everything is back correctly, no mods standard filter , it's was a micron end can from po Quote
RideWithStyles Posted April 17, 2024 Posted April 17, 2024 (edited) so Edited May 14, 2024 by RideWithStyles Quote
k3lv Posted April 17, 2024 Author Posted April 17, 2024 No he just propped it up , but I rang him and told him to just put my exhaust on ....as that's the only change been made ...he rang before firing it up an I barely heard it crank before she fired up so happy days he hadn't trashed my bike ......but guessing the end can he has is really restricted or blocked , thanks for the replies and suggestions ...just gotta sort out the rich running now 1 Quote
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