Post Number: 1
|Posted on Saturday, January 05, 2008 - 02:57 am: ||
Okay, this is my first post so bear with me. I have an old yacht fitted with a 1951 Stuart Turner P5MR which I have restored to running condition. I have two tips for everyone and one question.
Tip#1. Use unleaded petrol and top quality 2-stroke oil formulated for marine engines. In the "old days" the lead would form a whisker across the plug gap and stop the engine instantly. Inferior oil leads to gummed up plugs and a dirty exhaust.
Tip#2. Replace the old copper cored HT lead from the magneto with a modern silicon sheathed carbon cored one. The difference this makes to the spark is quite dramatic (at least it was in mine).
These two tips will eliminate 90% of the running problems that lead so many people to maintain these engines are unreliable.
Question. Why can't I start my engine reliably when it's hot? Cold, no problem, but after it's been running for a while and we stop for lunch, for example, I have to change the plug to get it going again. I've seen this same question posted on other fora but I've yet to hear a satisfactory explanation.
Post Number: 21
|Posted on Saturday, January 05, 2008 - 10:53 am: ||
Extact from P5/P55 h/book --------
"Plug points too wide is a frequent source of trouble and makes starting
difficult when engine is hot"
I can confirm this.I had a P5 50 volt genset that would not start from hot
with plug gap set to .025" at .015" no problem.