Help.... Wont start ,just backfire
 

I'm mean the fireball is awesome but I would rather hear her purr.

Here is what I'm working with
1991 CBR600 F2

Parts I've replaced

R/R Suzuki gsrx version wired up correctly.
New Stator
New ngk Plugs gapped correctly .035
New to the bike main wiring harness ,right hand control and ignition switch.
New starter solenoid
Cleaned carbs and fixed leak at the inlet T's
New battery
Drained tank and New fuel 91 oct

Here's my issue
When cranking the motor over, it turns over but every 10 seconds BOOM backfire.

I've made sure there is enough fuel going to the carbs, made sure the plug wires are in the correct order and coil leads are the right ones feeding the right wires.

Put the battery on the trickle charger to make sure its good. Had it tested at a battery shop just in case also.

Checked spark with each plug out against the block. Not sure how much spark I should see but each plug had some.

I've toggled the kill switch and cleaned the terminals on that and the ign switch.

What else can I check or what might it be??

Thanks in advance for any ideas or advice.

She Runs :icon_dance-twist:

Apparently what i thought was the right leads feeding each coil was backwards.
Here is a diagram of how the coils and wires should be laid out.

Attachment 32992

Now on to the next issues :icon_frown: Leaky Radiator,bad CCT and on and on, but im getting there.

Glad you got it figured out. It's a long process fixing things. But well worth it. Good luck

It was just nice and a relief to actually hear the motor run since i bought this bike knowing it didn't run.

If it weren't for this forum , i would be completely lost.
So if i have any useful info ill always pass it on,Hence the drawing of the coil routing.

​​​​​​im having this same problem where exactly is the coil I have a 93 cbr600 picture if possible. Thank you in advanced

I will check if I have some photos of this in a few hours.

http://www.motoguerreros.com/wp-cont...51078631_n.jpg

hey guys, im sorry to just jump on this thread with a diffrenet issue but im new here and im also pretty new with motorcycles even tho i have basic knowledge....i need help!!....I restored a 89 cbr 600F, new everything, the only thing i havent touched is the engine pretty much. I jetted it and if runs wtihout any issues even tho it never felt fast. last night my friend purchased a 2010 ninja 250r and i wanted to race it thinking i was going to blow passed him, but sadly I couldnt, it actually pulls on me a little, that cant be right. can you guys point me in the right direction, i am very discouraged...thank you

also where is the air mixture screw on this carbs. I dont wanna drill a random hole on the side of my carbs.....thank you again guys

Please help😏😏😏
 

Please advice would be greatly appreciative
i have a Honda cbr 600 f2 1994
wont start just back fire have replaced few bits
ie
coils
spark plugs
Rectifier
cdi
pick up
battery
cut off switch
ignition barrel
fuel filter
fuel pump
fuses
relays
cleaned carbs

so far I have spark fuel and compression it turns over for a few seconds then boooom back fire little fire from exhaust
if I pop little carb cleaner down ports it stutters put fuel in it backfires
was running great, pulls great I parked it up as broke foot so couldn’t ride
now foots better wanted to ride the beast again and the above started so I though would replace bits but pulling hair out now
any ideas would be much appreciated
thanks mark