16 replies to this topic

[benno1275]

hi i have just got my engine up and running and it backfiring out of the carb intake can any please help me?

i have set the timing to 6 degrees BTDC with advance pipe off.

put new points in and set them to 15 thou.

it ticks over great but and after a certain speed it doesnt do it it just likes to backfire when i blip the throttle

the carb is a hif44

its also had new coil and leads

[mini mad]

i had this problem its the gasket/spacer between the carb and inlet we replaced that and mine runs sweet as a num now :)

[jjojjas]

I managed it by being 180 out on the dizzy once.
Jas

[benno1275]

i have sprayed wd40 around the area and it doesnt speed up so i know it isnt leaking air also it wouldnt run if it was 180 out would it?

[minipac]

hi I had an air leak from my carb and I test it with wd40 and the car didn't speed up. and the air leak was that bad it whistled. and a nabour of mine come over and suggested taking the carb off and put sealer between each gasket. I only done it really to houmer him as I had already done the wd40 trick, and it work and solved my problem to my surprise

[jjojjas]

i have sprayed wd40 around the area and it doesnt speed up so i know it isnt leaking air also it wouldnt run if it was 180 out would it?

Well mine did. But really rough, lumpy and back firing. You couldn't drive it, but it confused me for a while.

[T.Harper]

Try 8 degrees BTDC too

[Retro_10s]

Backfiring through the carb is caused by underfuelling or incorrect timing (usually along with a smattering of incorrect fuel mixture)

Did you re-set the carb? have you set the static timing correctly?

[benno1275]

i have messed around with the carb now yes.

the procedure i did to do my timing was remove the vac advance pipe then set the timing light to 6 degrees BTDC and i then timed the groove on the pulley to the biggest pointer on the timing case. is this the way to do it?

[dklawson]

Since the car idles well and you feel you have the mixture set correctly, look for problems with fuel delivery. Look at both the float level in the bowl and the delivery rate from the pump. As Retro10s said, backfiring out the carb when the ignition is set correctly is an indication of fuel starvation.

[benno1275]

ok i see what you are both saying i honestly dont think the carb is set right but whats the easiest way set up a hif44 so i can eliminate the set up i will put a video up

[benno1275]

http://www.flickr.co...470951/#preview

[stardude]

has the engine been sat a long time??

i started my car after 6 months a few weeks ago, and to start with it was realy rough and back firing through the carb, but after a bit of revving and running it was fine. it just needed clearing

[benno1275]

it was last run about three weeks ago at the most does that video link work i put up of it

[benno1275]

i have fixed it,

like a boob i had got 2 of the HT leads the wrong way around haha