Dyno run

[Starquest]

Are you sure is 14.7:1 ? It's pretty lean to me. Should be close to 13:1.

[fj1289]

You can go with 14.7 for part throttle cruising - low load on the engine.   But for WOT you'll be happier closer to 12.5:1.


Here's a good discussion dealing with air cooled Porsche motors.  And remember when they are talking about using richer mixtures to help control combustion temps, They are talking about an engine with full cooling shrouds and forced air flow! 

http://www.masterenginetuner.com/air-fuel-ratio-tuning-tips.html

[Bozo]

Just for reference, here's someone else who put the bike on the dyno with airbox vs pods. I don't think I've seen any others posted that I remember. And it doesn't look like he ever came back with the AFR

http://www.fjowners.com/index.php?topic=17799.0

That was me, and I completely forgot about trying to retrieve the A/F ratio results from the Dyno guys    I remember them at the time telling me it was pretty well spot on at 14.7:1 once they had rejetted etc. Still running extremely well that bike, and I still have to get the '93 dynoed as well to see what needs doing.    

Regards
Ray

After having my bike dyno'd the AFR was around 10 down low and 11 higher, (my FJ has engine mods) I fitted an AFR gauge to the exhaust, changed the fuel mixtures to read 14.5 - no load cruising, 13.5 with a slight throttle, around 12.8 on full power. I now have an incredible mid range (4K up to wow) better still my fuel economy is better than standard (my other Fj which is std apart from pods)> 310 to 320 I hit reserve and safely get 400+ a tank full at cruising, riding harder drops around 20km off these figures.
Unfortunately Xrays bike is super clean / polished so I can't match his top speed