Post by 90GTVert on Jun 20, 2011 8:43:54 GMT -5
Project 90 : Phase 1 Review[/color][/size]
I've completed all of the modifications that I wanted to try one at a time on a stock 90cc Minarelli. Now I'd like to give my thoughts and opinions on some of the best mods. To do so, I've put together a top 3.
#1 : Cylinder Porting And Adjustment
This modification topped the charts for max speed and did as well as any other mod for cruising speed. I may have been a little more aggressive than some would be or should be for a daily ridden street scooter, but excellent results could be had keeping the setup more mild as well. A mild setup can be done for the cost of gaskets. If you push it a little more as I did, you may need to add on about $30 for a high compression cylinder head. Even with the head, you should come in at $50 or less.
If you don't feel comfortable porting a cylinder, a big bore kit like the Hoca 54mm could be a good option as well. With a price of $150 though, I would choose #2 above the big bore kit for starters.
#2 : Hoca Performance Variator
The Hoca variator came in a close second. It showed as much of a gain in top speed as any mod other than the cylinder porting. Cruising speeds increased as well, on par with some of the other top mods. One of my biggest reasons for liking this one so much is that the scooter was really much more pleasant to ride. Accelerating well, staying in the powerband, and feeling smoother in general. This one will set you back about $50, but it is well worth it IMO. I just don't think the stock variator does the 90+cc engines justice.
#3 : Performance Exhaust
An aftermarket exhaust would be my next choice. The stock cylinder may be a little mild to make the most of any of the performance pipes, but you can still see great gains. This class is next in line to the previously mentioned mods for top speed and cruising speeds are right there with the rest of the top mods. Acceleration is also comparable to the rest of the bunch. Check out each individual test to see which pipe you like the best.
I have to mention the other free mods. Removing the airbox snorkel and modifying the torque driver both showed gains and they cost nothing. You do need to upjet with the airbox mod, but for the purposes of this project I leave out tuning supplies in costs. Neither of these things showed big improvements at this stage, but it's hard to argue with free.