Wed Mar 5 09:13:55 1997
- Message No. 472
From: Pierre DEBRAS
Subject: Re: Shooting
Hi Martin Bang,
Bang in the muffler may be cause by what you eat ... So my first advice
would be: use good quality fuel (major brand ones are always conform to
specs, other not always).
Bang in the muffler is caused by non-burned fuel going into the exhaust.
It's definitely not normal on the AT. I would check the engine tune-up
(air filter, valve clearance, carbs balance ...). This may be due to to
'lean' or to 'fat' carburation.
But to make things clear, there is no screw or whatever on the carbs
allowing you to change that (except for idle speed). So lean/fat is always
the symptom of an other problem: dirty air filter, abnormal air intake,
(very-) unbalanced carbs ... (*)
The tip from Andy is empiric but very effective to check air fuel/mixture.
By the way, you don't need to check the four spark plugs. One per cylinder
is enough. The inner sparks are very hard to remove.
(*) Well, in fact there is a screw for carbs balance, but you need a
special equipment (vacuum-meter) to adjust that.
Have a nice ride,
Pierre
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