Hi Freud
It's been a bit quiet as I will be doing a big interstate move in about 6 weeks.
I have been doing a bit of limited "Porting" work on the "Modified Cylinders" for the next stage 250cc engine so I can run the Lectrons on this engine as well as the 350 Class engine.
The RGV engine is a Production Road Engine and is limited in how much power it can make, ( that's compared to Late Model Honda RS or Yamaha TZ 250 cc Road Race engines ).
But these mods will hopefully get everything working in a way that it was intended. Exhaust Pipes, Higher Comp Heads, Carbs and the Sunoco Gasoline.
I just finished these cylinders today and now have,
.9mm skimmed off the top so they are like Suzuki "Race Kit" barrels and I can use Suzuki Race Kit 1.4mm gaskets that raise the port timing and still use all the Heads/Inserts that I have.
Exhaust Ports widened 4mm on the Ears. This is one area in these engines that can benefit from a little opening up
Entry to the Transfer Ports altered to eliminate the sharp entry, it has been found that you can gain power by having more rounded entries on the base of the cylinder instead of the previous Knife Edge dividers.
Before
Modified
1 mm wider and deeper on the entry to the Aux Transfer Port.
I have now done a bit more tidying up today and the Cylinders will now need re-plating.
3 possible things will happen: Nothing at all or I will gain HP or they’ll be stuffed. I rang the local Betting Store to see what odds I can get on the second outcome and it came in at 100:1
Pete