Custom/Hybrid BOB backfire

[stg5685]

Ok everything is hooked up correctly and my bob is still backfiring. im pulling gas and getting spark. could it be a bad msd enhancer? before the swap everything worked fine the only think that changed was a stock sj tank to a kart tank

 

[ChrisFiore15]

Timing?

 

[DAG]

Did you check your timing to make sure its not 180 degrees out?

 

[stg5685]

how do you check the timing?

 

[Matt_E]

Did you check your timing to make sure its not 180 degrees out?

Not possible with a stock charging setup and Enhancer.

 

[rubbertoe]

backfire can also be caused by unburned fuel that reaches the pipe , check your carbs

 

[Twinturbostang]

Woodrow Wilson

 

[rubbertoe]

sheared keyway ?or1919 ?

 

[Twinturbostang]

Yep

 

[stg5685]

sheared keyway ?or1919 ?

whats 1919?

backfire can also be caused by unburned fuel that reaches the pipe , check your carbs

what would i be checking for theres no fuel in the carbs that i can see

 

[raytherace]

plug look like what ??

 

[rubbertoe]

the year 1919,put it this way, it was a good year for woodrow.well there should be fuel in your carbs,but if you have a bad seat .its possible to have fuel leak into the pipe,then when you start it kapow!but if this is the issue its usually a violent backfire.if its backfiring while running its probably timing ,could be a sheared woodruff key.

 

[Twinturbostang]

He's my CSI, if you really didn't change anything but hulls.
The first back fire was from over priming and you have gas in the cases or chamber or somthing. That first back fire broke Woodrow Wilson. Now you are off timing.

 

[Twinturbostang]

Oh i guess that was just said. I didn't see that before I posted.

 

[ChrisFiore15]

Oh damn woodrow. that bastard.

 

[stg5685]

ok so before i order a new msd how do i check the woodruff key? it is a violent backfire and its as soon as i left off the start button. Another question can you have a bad msd enhancer and still be getting spark?

 

[DK-Freestyle]

Are you sure your plug boots aren't switched? I've seen that happen a few times

 

[stg5685]

Are you sure your plug boots aren't switched? I've seen that happen a few times

i tried that still backfired. with the stock ebox which goes to each cylinder just so i can make sure there right.

 

[Tyrant1919]

1919 you say? A good year indeed!

 

[Matt_E]

Are you sure your plug boots aren't switched? I've seen that happen a few times

It doesn't make any difference in a stock charging ignition. NONE whatsoever.