7 replies to this topic

[EvanB]

My Mini (74 998, HS4 carb) was running rough and overheating so I changed the headgasket. It was burned through between cylinders 1 and 2.

 

I got it back together last night and adjusted the valves. When I tried to start it it backfires through the carb at idle. I didn't change any settings to the timing or carb while the head was off.

 

It seems to smooth out a bit when revving but at idle or when letting off the throttle or pressing the throttle it will backfire through the carb. I turned the distributer a bit to see if it made a difference and it smoothed out a bit but still backfires.

 

Any ideas on where to go from here?

[lrostoke]

could be an air leak on the manifold.

 

Or maybe even ht leads on wrong

[jaydee]

Adjust tappet clearance again, check for airleaks at the manifolds, then re-set mixture to 3.0% CO at idle

[eeae6000]

timing!!

[EvanB]

HT leads are on correct. I loosened the valves up a bit thinking maybe the intake valves weren't closing all the way. That didn't help any. I tightened down the manifold a bit more. It seemed like there was a bit of seepage of something on the gasket around the intake runners. I sprayed carb cleaner all around them while it was running and it didn't change anything.

[dean]

As said before reset tappets.

[EvanB]

I found the problem. Somehow in my hurry to get it put together I thought the ignition rotor turned clockwise and never thought I could be wrong. I put the wires in the correct order and it runs great now!

[lrostoke]

:)   happens a lot that's why I suggested it