[Michaellawrence]

I have a 2007 Honda rancher 420 fuel injected. It will crank and crank and back fire out if exhaust. It has a yellow/orange spark. It is getting fuel. Could the spark be bad cdi? How could I test it? Thanks in advance!

 

[dr. feelgood]

Spark should be bright blue. I'm assuming you tried a new plug already?

Rob

 

[Michaellawrence]

Yes I did. I also put new stator/magneto in it

 

[johnnycombo]

Did you check your valve clearances and timing?

 

[shadetree]

back firing out of the carb tells me it's out of time.

 

[johnnycombo]

When timing is off for what ever reason it can be advanced or retarded, your getting fuel pumped into the exhaust and then it's getting ignited. The Valves may be to tight or just out off time. Check them and take them off the possibility list, It's free to look before buying more parts you don't need.

 

[johnnycombo]

Being that you have been cranking a lot, you should give your battery time to cool down then recharge it. The high voltage output of the coil is dependent on the the low voltage going input, Your alternator is also dependent on the battery voltage.

I've noticed for years how cold hearted Hondas are and how much easier they are to start with a strong battery.

 

[shadetree]

When timing is off for what ever reason it can be advanced or retarded, your getting fuel pumped into the exhaust and then it's getting ignited. The Valves may be to tight or just out off time. Check them and take them off the possibility list, It's free to look before buying more parts you don't need.

if it was valves ?, then the compression would be to low to fire/ignite, and run ?, but if the timing is off ?, then this would force the ignited fuel out the intake valve, very posb the intake valve is not right ?, soo..maybe we are both on to something here .

 

[johnnycombo]

When you do trouble shooting it's not what you assume is wrong it's the possibilities you eliminate. Checking to be sure is free!

 

[shadetree]

When you do trouble shooting it's not what you assume is wrong it's the possibilities you eliminate. Checking to be sure is free!

agreed !..lol.

 

[Melatv]

Hi: Your bike is a FI -- you said you replaced the stator -- did you remove the CKP (crankshaft position sensor) ? is it plugged in?

 

[rodp]

When you do trouble shooting it's not what you assume is wrong it's the possibilities you eliminate. Checking to be sure is free!

Even the worlds best agree with this principal,...... but in different words.

Sherlock Holmes. How often have I said to you that when you have eliminated the impossible, whatever remains, however improbable, must be the truth?


:laugh::laugh::laugh: