Quote:
Originally Posted by Global Rider
A co-worker dual plugged his old R100 RS (maybe he bought it that way). He didn't comment on any power increase, but he was very happy with the extra 10 MPG increase.
You can't just dual plug and ride off. You then need to reset the idle ignition timing and limit the amount of ignition advance.
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I am curious, How did he know he had a 10 mpg improvement if he bought the bike dual plugged?
If you spend the same amount of time doing a normal service ( include diaphragms, needles and needle jets I believe you will get the same or better results. Running a low compression will reduce the mpg slightly, but early post war 1945-50 Triumphs had 7:1 and would run happily on 'pool pertrol' ( 65 octane). One of the reasons I chose my BMW was because that model was designed fo modern fuel and has an 8,2 CR. It runs absolutely fine on 3 star. It has been stated that the pre monolever bikes with high compression engines are the ones with the problem. To fix the compression ratio ( poor modern fuel) problem lower the compression ratio with BMW's own fix at £7 a go. Spend the rest on petrol and  . Only BMW's seem to suffer, no other biking forum I am on mentions it. I think in part it is caused bytheir use of a wasted spark which heats up the plugs more than a non wasted spark system.
Last edited by oldbmw; 21 Dec 2008 at 20:51.
Reason: double plugged tripewriter
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