Subject: Re: huh?
Author: Zerhackermann .
Date: Aug 14, 2001, 4:43 PM
Post ID: 1707869627
| Two issues. Firstly, the distributor counterweight springs are designed to hold the ignition retarded against the increasing centrifugal force of the weights. Weak springs or removing one of the springs will only allow the system to advance earlier in the rpm slope leading to pinging. New springs will hold better against this force and will help control pinging. |
That makes sense. But when Bob Nolan says it works, there isn't many guzzi
folk with the knowledge to put up a good argument with him. It's second
hand, so I gotta track him down and get the true skinny.
| Secondly, what's the age of your cylinder heads? A classic Guzzi problem is that the valve stems wear their respective guides slightly oval. There are no seals on these guides. The vacuum during the intake stroke pulls a little oil mist from the rocker arm chamber, past the guide and mixes it into the combustion mixture. Regardless of your fuel quality, the effective combustion octane rating of this polluted mixture goes way down and leads to pinging when hot. This oil leakage is microscopic and doesn't produce exhaust smoke or high consumption rates, but it does cause pinging. Consider valve work for a future project. Sorry. |
I ralize that, But I don't quite buy it in this case. It is a new
developement. Not an ongoing one. There was no inging till I started trying
to get the timing "correct"
Based upon what I been through today, it is weak springs. With none less
than 3 days away and me about to take a long trip. #@!@#
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