Nrg extreme, a/c 2000 model.... . Im stuck on wether to try and shoehorna a typh 125 (or similar) engine in, or just to fit a sexy 70 kit? :3 Other option is a big evo build..... Does the evo piston work with any other crank? or have they fisted us with the evo crank? Any rough bhp figures that are achievable with the above? Evo builds can aparantly realistically achieve 24bhp....
Seemed to totally miss this topic. Conversions are always bodge. It never works out just right. A big evo build would mean converting your bike to liquid cooled but that wouldn't be bodge as NRG's were made as liquid cooled bikes so all the vents, space for a rad, etc etc is all there. Theres quite a few topics detailing what is involved in a big evo build or similar. Some are claiming close to 30bhp with the big, big bore kits from polini and malossi.
EEK! Just found something much more apealing to me than the big evo build http://www.psntuning.co.uk/scooter_parts.php?prt_id=1708 Parmakit a/c 90cc..... Parts are far cheaper, im aware it probably wont put out anywhere near the power the evo does. Wont have to convert to lc either :') Also has the advantage that i dont need to buy every single evo part to run one cylinder, i can intermix
Er what? You don't have to buy lots of evo parts to run an evo engine. That kit is only about £40 cheaper than a big evo for a much much worse kit. They are known to be of poor quality and need a good going over before they can be used. Getting an exhaust to match that kit would be a complete pain in the arse as well. Basically you get all the pain of fitting a really big bore kit to a scooter so having to machine the cases, having to machine the cases for the crank, etc but without the performance. Converting to LC on a high performance build is no bother at all. It's just a case of a few hoses, a rad, coolant bottle, and an electric water pump. This is coming from someone who is doing it at the moment! If you are serious about it though I have a crank lying about that is perfect for big big bore kits.
Youve tried to sell me that crank with the utmost persistence so il ltake it off your hands Thanks for that, this is my first ever build so im taking your word as gospel. I dont see the point in putting a low range 70 kit on my ped as it wouldnt be anything special. I enjoy projects to do with anything so thats why im doing this in a big way
Reason i said the above about the full evo setup is that i was told by someone with less knowledge on the subject than you, that i would need the evo crank, ignition etc :cray:
You don't need evo parts but you do need the proper bits. You may need an ignition as well but it doesn't need to be a polini one. I'm currently trying to get away with just modifying the stock ignition so i'll know pretty soon if it's an impossible thing to get away with. All these kits do need flow work done on the cases as well. I linked you to the relevant topics already! http://www.scootershack.co.uk/scooter-tuning/aerox-polini-big-evo-94cc-t22331.html etc.
ignition is dependant on compression and exhaust used. ive ran evo timings on a COMPLETLY stock ignition and seen well over 15,000rpm didnt l;ike it, but it got there lol. the evo's peak at around 13k out the box, less with something like a c16 pipe. so they really arnt as touchy ignition wise. can run with fairly cheap cranks but they are big barrels and need case work to really get them matched up and performing well.. the bigger stuff is lots more machining.
