What I was meaning was that if you exclude an F1/F2 driver that doesn't want to do nationals but would rather spend time racing with his F3/F4/F5 budies then none of them might show up to your event. For example I drive my friend Adam U around the country for race meetings, I am faster than he is on basic pace so if I was excluded he would probably chose not to get in his car and burn the fuel alone. (And before somebody says anything I know I'm not doing nationals this year and am having to work hard to get hold of an F2 via the 100 strong west mids regionals ... just treat it as an example).
If you discourage the F1/F2 driver (by adding a performance penalty, putting it on a national weekend etc.) and he still choses to race then in your series with his mates then why not let him? Just make sure he doesn't get it all his own way!
Because we buy new tires most events but buy 1 motor a year (some people get years out of a brushless unit). If I had to use TIRE A at a cost of £8 to compete I'd not be put off, if I had to use MOTOR A at a cost of £50+ I'd never enter. I think a lot of people are the same.
The other thing with a motor rule is that a lot of F3/F4/F5 drivers still have some assistance from shops / distributors and thus might not be able to get MOTOR A and / or upset their supporters by using it.
Then add in to the mix the fact that some of the faster drivers might be able to drive a 7.5 around blindfolded but Little Jonny might struggle to get around with a 13.5.
I loved stock racing in years gone by, would be well up for a 13.5 or 10.5 championship personally but I know a lot of people who aren't interested in bolting in anything slower than say a 5.5.
Maybe include a limited motor class (say 10.5???) as a sub championship, that way everybody is still racing together but those that felt happier running mild motors had their own title to chase rather than getting pushed down the order by those that can hang out with a 4.5. Now if somebody from the "limited" class was making overall A finals then good on them (... and I bet they would have people offering them assistance fairly quickly).
Might be worth excluding the F1/F2 guys from the "limited" class though, nobody like being beaten by pot hunters
I did state any control tire should be a "commonly used" tire so people could "use up what they had left from other meetings". Soon as you force people to use something they aren't familiar with and will never use again many will be put off. Schumy / BB minis are well used and understood tires ... I bet everybody reading this has got a set glued up waiting to go! The thing is they have no reason to sponsor / assist a series such as this so it might be better to offer an alternative tire IN ADDITION to attract their assistance. You have to be careful to find teh right balance though.
RRCi used to have scrutineering, I remember my Pred being under weight and there was always "discussion" about legality of stock motors if one brand proved dominant. I think that a few sensible rules encourage a fun atmosphere as they rememove the "how do I beat Jonny as he has that special motor" and / or "they are cheating as that isn't in the spirit of the event". We've all seen that.
As for the number of tires allowed it is as simple as marking the sidewall / wheel joint with some nail varnish ... maybe allow 1 set of brand new or 2 sets of warn, have a different colour for each and move along each meeting (so last meetings new becomes the next meetings used).
As I've said before there is no way to please everybody so the best solution is a few sensible souls get together, thrash out 2 or 3 proposals for formats/rules and put them up for vote on this forum. Make up the overall rule set based on the most popular non contridicting ones.