🚀 go-pugleaf

Are there any distributor experts out there? I'am having problems diagnosing
an advance problem. I will mention that the engine resides in a boat, but all
in all it's basically a normal Volvo B20 engine. The engine develops a ping
at 3700+ RPM; I can't decearn any ping on sudden acceleration or any below
this RPM. It's possible that running regular gas may be affecting this, but
I've never ran accross a ping which didn't occur during acceleration. I tried
retarding the timing as far as possible without any luck. This has lead me to
believe that the pinging will only be rectified by changing the advance springs 
in the distributor. If I'am right in this assumption, would I use stiffer
springs -or would this not cap the advance curve?

Some specifics:

Engine: 1975 Volvo Penta 130 (alias B20?) with dual solex carbs -recent rebuild.

Distributor: Bosch (JF4) mechanical advance, points.


Thanks for any info!


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       	  which have already been used, but in a different order!

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               Mark Nagel; John Fluke Mfg. Co MS 223B;
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