Right, my project is well & truly underway & this is where the stupid questions start. I have won a Malossi 70s kit on Ebay, so am looking at rollers, carbs etc. I am, hopefully ripping the engine down today to see if there are any "goodies" already fitted. I know that it has a TNT Manual choke carb, that I believe are shite, so will probably ditch it & go for a 100 carb & manifold & I'm guessing it's got different rollers in because it doesn't start to roll until it hits 8000 rpm. It's also fitted with a Doppler exhaust, so hoping it won't need too much more. I'm looking at something that is fun to ride & fairly quick (if it ever can be ). So my question is, what would be the best setup for it? Roller weight, clutch springs etc.
Hi pretty much impossible to say without trying it but I'm guessing a stiffer corrector spring and maybe lighter rollers. Which Malossi kit is it ?
Its a 31 9477 MHR Replica cylinder kit according to Malossi's website. I need to do a bit more homework on these scooters, not used to them lol
that should work well. dunno if you can just slap one of those on though. might need a bit of casework. Should be a beast though.
Are we talking cars, or 2 stroke mopeds here? If it's cars, they have too many wheels for my liking, haven't owned one for years. Too much hassle
Now then. Onto jet sizes. I've bought a speedy 100 delorto & could do with a heads up on what size jet for the 70cc set up. I've seen the boxes of different sizes, but need a ball park figure so's i don't buy the wrong box
My jetting guide: look at what's in there before you start. With the same air box - upjet 10 /15 points for a move from a 50 to 70 cc motor - 10 /15 points at least for an exhaust another 10 /15 points for a bigger carb - then add 5 points for the god of piston rings - try it - and down jet by two's 'till it works. If it's an open filter - upjet by 30 points at least all the points are cumulative. So if you take a standard Ovetto (my scoot) - which started out with a gurtner 12 mm carb with a stock exhaust - jet is about 65 Kit 70 Carrerra 16 28 mm carb Foam filter You start with a 145 and work down (you end up with about 130/140 depending) My maths may be out - but if in doubt, always err on the big side with jets. Saves engines - All two stroke engines are liquid- cooled. And the liquid doing the cooling is petrol.
