Wrong fuel-air mixture 2007 GT250R EFI
- This topic has 1 reply, 2 voices, and was last updated 9 months ago by
.
-
Posts
-
-
Bike Model = : GT250R 2007 Fuel-Injected
Hello everyone! I bought this GT250R EFI about 3 months ago and till this day i could not find what’s wrong with the bike.
First day after I bought it, it would not start. Engine is cranking, no FI light. I replaced the sparkplugs and started well but works only for a few start ups then it floods the sparkplugs and wont start again. I replaced the ignition coils and still the same problem. With new spark plugs the engine starts easily.
One day I was out with the bike and suddenly started to run one cylinder, i shut off the bike and that was it, it wont start anymore. I did a compression test and show 8 bar front cylinder and 2 bar rear one. Took the engine out and did the valve seats, now it has 10 bar compression for both and I think that it should run with this compression (correct me if I’m wrong). Again I replaced the spark plugs (CR8E) ran well till the spark plugs got flooded. I should mention that before the engine rebuild the oil was mixed with fuel. I checked the piston rings, pistons, cylinders everything looks good. I guess fuel got into the oil because of a spark plug flood and the engine was still compressing the fuel till it slip between the rings into the case.
Now I’m stuck with a non working bike and I cant find the problem, I think it is electronic based. So far I checked the compression, the fuel injectors spray well, the temperature sensor is working, the valve clearance are fine, timing looks good. I took it to a mechanic that made it actually worse. What I mean is now the bike wont stay idling at 1700rpm, sometimes it goes up to like 4000rpm but it lowers once I rev it once. ISC seems to work (I mean it does something at least). It also consumes much fuel and exhaust gas smell as gas.
I’m new to repairing bikes so I could use some precise explaining on how to diagnose this. How can I read the ECU errors? Is there a special cable to do that or something? I saw that 6 pin connector under the tail and I assume that’s for the diagnosis. Also the self-diagnosis shows nothing.
Something that needs to be mention: the old owner said to me (when I bought it) that he replaced both the fuel pump and voltage regulator. (I think he mentioned he put kawasaki ones if I remember correctly).
-
EFi service…
Old and grumpy,(?), have fairly wide engine & tuning experience, "restoring/resto-mod" on cars & mc, worked as electronic tech. (retired).
GT125R - sold. New (used): 2012-GT250R-efi (sold)+ 2017-GV-125C (sold) - got my old 2018-GT-125R back... 🙂
-
- You must be logged in to reply to this topic.