Five A Day

If you struggle to fit any fruit into your diet - run the bike on it instead. A very careful re-distillation of the Diplo Apple Ethanol has upped the purity sufficiently to get some smooth running.
The carb has been previously jetted at BSD (see earlier post) to run on commercial E85 which is 85% Ethanol mixed with 15% Gasoline to aid cold starting. Our Diplo85 is 85% home made apple ethanol and for the 15% gasoline we used some AvGas to lift the octane level a bit nearer the 109RON of the E85 we're jetted for. Result ! As you can see we've fabricated a tank from a Fanta bottle and the bike can be switched between E85 and Diplo85 by swapping the fuel feed line over on the carb. MORE FRUIT !

Stress-Free Fuel Testing

Last month I was saved from taking the gas-axe to the CB special by the expertise and wisdom of Mark at BSD (see earlier post). Being a huge fan of experts, pretty much regardless of the field, it was an easy decision to ask Mark if he'd tackle the fueling work on Diplo Jnr's XT. Diplo Jnr has made a quantity of ethanol by distilling last autumn's cider production. The resultant juice is around 82% ABV and suitable for blending with aprox 15% by volume of gasoline to make his own, home-grown version of the commercial E85 available at some forecourts. (The 15% gasoline is required to aid cold starting as it has some of the more volatile fractions missing from straight alcohol). Re-jetting to get the simple, normally aspirated, sluggish 4 stroke to run on alcohol involves dispensing an estimated 30% more fuel. Much as I love trial and error (the largest department at Diplo Technologies Inc) it seemed wise to keep stress levels at bay and ask Mark at BSD to take on the challenge in the comfort of his dyno room.
Within 10 minutes our expert had the XT running sweet on some commercial E85 that we took along by upping the main jet, re-drilling the pilot jet and raising the needle a tad. We actually get a 5% power gain at this point. Next stage was to switch to Diplo Jnr's own fuel. We got the bike running but intermittent missing and spluttering was tracked down (by Mark's nose for these things) to excess water in the fuel. Conventional distillation should enable us to get a maximum of 96% pure Ethanol, beyond which unsavoury chemical processes can be applied (the use of benzine is the most common !!!!).I know we're way short of that and our target of 85% should be good enough. Back to the 'shop and we'll re-run the still to see if we can get rid of a bit more water. MORE DISTILLATION !

End Of An Era ?

I bloody hope so. Since getting the CB Special on the road last year it has been a constant source of angst, frustration and dissatisfaction - lovely little bike it may be, but running issues have been exasperating. Earlier posts detail the attempts to solve revving out issues. As a birthday treat I took the little beast to BSD at Eye Green near Peterborough, our local dyno guru and serious bike tuner, - initial concerns over asking Mark to tackle such a project proved groundless and he accepted the challenge very politely. Next day a quick 'phone call to say the bike needed collecting ! Fixed, runs like the beauty I knew was in there somewhere - duff after-market ignition coil !@%$£!?*&@!!. MORE EXPERTS !