k reg zxr400 wont start backfires

[amypauljack]

hi just got a non running zxr400 on a k reg was told it ran a bit rough up until ahole in exhaust was patched up. when i turn engine over it just backfires now and again, i have added fresh fuel and there is good spark at the plugs, fuel pump works ok wot could it be the carbs i was thinking or could it be the cdi thanks paul

[CaNsA]

drain the carbs, wait 5mins, give it a 1/3rd choke no throttle hit the starter.

let me know

[liam7200]

sounds like you have had this problem b4 cansa lol

[CaNsA]

before i got the lump tuned and sorted a few niggles out i did

Also, turn the lights off if you can.
Gives the starter motor a bit more punch.

[RedexRobB]

may also be fouled plugs, so may be worth whipping them out and giving them a clean and resetting the gaps

[amypauljack]

drained the carbs cleaned plugs still no luck just backfiring and the odd flame from exhaust and carbs

[RedexRobB]

In that case get those plugs out and clean them up. They are more then likely soaked in fuel now, so a good clean and heating with a blow torch or the hob if you have a gas one.

[CaNsA]

Where are you amypauljack?

Also, might be worth askin if you can have a decent forum name, cos lets face it, thats a bit of a mission to type.

[RedexRobB]

just re-read your post, you already cleaned them......

how did you do it?

[amypauljack]

cleaned plugs with wire brush /emery cloth sparks good now, i was thinking could head gasket have gone and engine be losing compression has anyone had this happen or could ignition timing of moved somehow i am in lancaster thanks