Spark plug gap

[dan filipi]

With all the pulling plugs and putting back in I must have bumped the plug tips enough to lower the gap.
I found all 4 around 28.
After gapping to 34 the spark is much hotter.
That little bit made a BIG difference in spark.

Spec calls for 80-81 28 gap, might try 34.
Seems to run better now.

 

[slabghost]

Gaps get bigger with use. If it starts sputtering or losing power close the gaps a little.

 

[dan filipi]

Gaps get bigger with use. If it starts sputtering or losing power close the gaps a little.

Yep, that's where periodic maintenance comes in.

 

[joedrum]

with dyna setup the mongrel could take a lot of gap around 38 or so ...it would run great and idle better too ..... :mrgreen:

 

[AApple]

A wider gap could also put a strain on the coil(s) from trying to fire across...just a thought. I'd be worried about the coil(s) getting too hot. Let's see how Dan's works out for a few weeks...I'm all for more power! :Egyptian:

 

[dan filipi]

A wider gap could also put a strain on the coil(s) from trying to fire across...just a thought. I'd be worried about the coil(s) getting too hot. Let's see how Dan's works out for a few weeks...I'm all for more power! :Egyptian:

Well the book calls for .031-.035 for '82 and '83. Mine being an '83 they are where they should be.
I was thinking though if the '80 and '81 models have the same coil specs then running them at .034 instead of .028 might give a little boost. Would have to check the coil specs.

It had just occurred to me now the earlier models have a problem with melting spark units.
I wonder if too wide of gap could have something to do with causing that.
I guess a wider gap would make the coil work harder which in turn would need more current to pass through the spark units heating them up.