Spark plugs

[Cuppy420]

Ok so...got the carbs cleaned and we are seriously struggling to get them synced. How do I find the correct gap size for my plugs besides the manual? Manual says 0.8 - 0.9 but theres no way that gap is that huge!! Previous owner had plugs gapped at .34 mm and that seems more reasonable but I have no idea.

 

[99yam40]

maybe you are confusing Metric and what we use here in the USA

 

[Cuppy420]

maybe you are confusing Metric and what we use here in the USA

Lol...I know how to gap plugs. I've been around cars my whole life. The gap that's given in the manual is just...unusually large to me

 

[airshot]

.9 mm is only .035 in sae measurement....sounds about right. .34 mm is only .013 in sae measurments...way to close. I think you have mistaken the metric and sae measurements

 

[racerone]

Gave to agree ---airshot

 

[boscoe99]

Any idea as to the model of the motor or the spark plugs?

 

[boscoe99]

What does syncing carburetors have to do with setting the gap of a spark plug?

 

[boscoe99]

"Previous owner had plugs gapped at .34 mm and that seems more reasonable but I have no idea."

"Lol...I know how to gap plugs."

Which is it?

Apparently no to the second verbiage.

 

[boscoe99]

Typical Yamaha spark plug gapping information is seen below. Same gap. Different units of measure.