Tuning aprilia sr 172 AC help/advice?

Aprilia sr 172 not MHR just malossi, 25 dellorto carb big pm air filter, 120 jet, pm52 exhaust, pm tuning variator and black spring that came with it, 12 gram rollers, standard gearbox and crank and cdi, does 80mph on clocks 75mph clocked by a car, its my first 172 and when i had it it was standard, i bulit this mself and was wondering if theres any other go faster stuff? want it reliable but bit faster, gear up kit which ratio would i buy? and any1 know the standard ratios? any help much apprechiated!!!!!

 

Anyone. ?? Even a good fast setup ??

 

See you say pm52 aren't good but pm say the pm 52 is just as good as the pm55 and the pm59 is higher revving? And my plug is white anything below 112, 120 still don't seem great, just can't seem to set it up properly, and the majority of my mates who ride 172 run 110s on liquid cooled runners? If can find a cheap 55 or 59 will consider changing but what differenece will it make? And as for gear up whick ratio? I've seen 15/41 and 15/39 secondary

 

Cheers for the info mate, and no air leaks as I can see replaced pipes manifold, and I have got a big open filter whether that adjusts jetting a lot? And I have a 50 pilot in ( was 70 when had it) aq266 atomizer, d24 needle 2nd clip from top, and 120 main, 60 choke, and alrite ill go for the 15/39 and nobody by me got dyno so. And as for rollers should I put standard spring back in? I think the pm one I had was slightly shorter and softer?

 

40 slide, and thanks for info mate much apprechiated

 

Right had engine completely out today, had to tighten mount as was nightmare to do whilst in bike, so while I was at it looks in barrel piston looked fine nothing wrong with it everythings sealed properly, cleaned carb and sealed reedblock and maifold, left setup for now as want a plug chop it, put a new plug in it now, engines back in just needs panels back on which ill do tommorow, 50 pilot 40 slide, aq266, 120 main d24 needle second from top, instead of just dropping jet by 10, shall I work down in 4 sizes a time? Also will the 180 gbox fit my engine with the rolling nut case and the bearing clutch rear pulley? Thanks!!

 

The weight of the rollers are 12 gram, I have some 12.5s somewhere and 15.5s which came with variator, and lean needle or richen?

 

Also, due to my engine not being very revvy as it only has bolt on parts, will roller weight need to be lighter to pull the gear up

 

thanks minor very helpful.

 

What Minor say's is quite correct as far as I'm concerned, as for rollers it's a case of what work's for your weight/engine set up etc. Imagine riding a geared bike and slipping the clutch, you could rev it to 10,000rpm ease the clutch out and off you go, or rev it to 6,000 ease the clutch out without it bogging down and your've 4,000 rpm left to play with. Every engine has a "power band" of rev's that the engine work's best at eg, 6000 to 9000 rpm, so you need the rollers biting at 6100rpm making the most of the "power band" no point in having rollers to light making the engine rev to 7000 rpm before it start's to do anything as your've lost 1000 rpm just revving doing nothing. I hope you understand what I'm trying to say . That's how I see things and the way I personally set up an engine, I am of course no expert but my engines seem to work quite well! My best engine,(183cc runner) shed tuned made 23hp on a rolling road in Batley with no alterations as it was set up just right for me. Probably best listen to Minor for good tech info.