let me start by saying I do not own this scooter, nor have I ever worked on one like this (many motorcycles tho). I was asked to diagnose issues with this machine after original dealer it was purchased from could not diagnose the issue, had it for 6 months and has since gone out of business. It then went to another motorcycle dealership, they had it for over a year, threw a bunch of parts at it and still could only diagnose part of the issue.
The original problem: would not go over 30mph, etc. - Diaphram was cracked (known to be a problem from reading here), which last dealer replaced along with a new fuel injector that was installed, new belt and a brand new throttle body in a box scooter was better but would hardly do 50. Sometimes it would start sometimes not.
I now have this machine and have been tasked with solving the issue.
this bike has had the fuel pump gasket changed and the new harness for fuel pump recalls and has 2 punches on vin. I have since replaced the fuel pump with updated pump (solved starting problem) and am now working on the hardly 50mph issue. I went through all self diagnostics- everything tested fine with no issues or check engine light. so now im going after the mechanicals if the drive train. besides the typical caveman things done to to this machine prior to me like every other bolt head stripped from using wrong tipped screw driver/hex key, to every other nut rounded off from wrong size socket/12point vs. 6point. 🤦♂️ so now i have the cvt guts exposed and here is what I found. clutch and belt has been changed but drive ring looks glossed over so i dont think it was. on the variator side there are two distinct grooves on each side of the pulleys toward the outer edges, not only can i feel them with my nail but my finger plain as day, and when I took the variator off the shaft and slid it apart there were only 4 rollers/weights in it??? should there not be a total of 8? from what Ive read, the belt gets stuck in this groove, between that and the lack of 4 additional weights be causing the 50 mph senario? I should also mention the rpm are ruffly bout 5500 when at 55mph, machine is also consistently driven above 5500+ feet in elevation.
I look forward to any advice!