I'm afraid tis me who needs the bow down emoticon.
I read that and after the second read it made some sense and I checked my Mikuni V's Keihin (flow V's bore size) it works out like so.
Mikuni(cc/min) Keihin(actual bore size)
230 1.311mm
220 1.282mm
210 1.253mm
200 1.223mm
So the progression IS linear with consistent 0.029/0.03mm changes in bore sizes.I did some dodgy maths and I got a consistent 5% change in area which should give 5% more flow.
Learn a new thing everyday.
Top of the class KR-1R =D>
Bikemike wrote:It's probably no help (as several have pointed out, each engine is individual etc) but my quite heavily tuned (but still 250cc) Graham File engine runs 142.5 mains and 40 pilots; so yours doesn't sound far out to me.
As pointed out previously the n99 needle is the improved one fitted to the C3 model, it's generally considered the one to have.
Mike
Hi Mike, did you use a dyno recommended by Graham File believe he uses someone who still analyses the exhust gases?
Gary
I've not used these guys but have spoken to them, they seem pretty clued up on two strokes (they race h***a Rs250's) http://www.doubletakemotorcycles.co.uk/
Has anyone used/heard of them? They seemed pretty confident they could set mine up and said they had jets etc to do it.
I think TwoSI was taking about a Temperature probe rather than Exhaust Gas Oxygen/CO sensor.
Dont know if an EGO is much use on a two stroke because the combusted oil might give an inaccurate reading and certainly clog an expensive sensor quickly.
EGTemperature is commonly used in snowmobile racing where a gauge up around 1100°C range (per cylinder) gives an indication if the motor is running outside its normal zone - too lean where it heats up or rich if runs slightly cooler than optimal.
Or if one cylinder is performing differently to the other.
If weather conditions like air pressure (altitude, temperature etc) change, can let you know jetting needs to be changed
(around US$100 per gauge/sensor but they are often quite long and best mounted close to exhaust port)
