Ok. I was getting good top speed, best of about 48mph on the speedo downhill, then it dropped off a bit gradually over a few weeks till i struggled to get to 45mph, usually got about 43-44. I checked my belt which was the stock original and it looked a bit worn after 13,000km so i reppaced it with another Nakura belt the stock size and i got my topend back again. All was fine for a month or so then it dropped off again. I checked the new belt and it was fast becoming toast, the top surface at edges had come off on a couple of areas, so i stuck my old worn belt back in till i got a new one ordered.
New belt is a Malossi kevlar, 736-17.5-30, longer than stock which i wanted to try out. Took it out and i got it off the gauge downhill so i was well chuffed, 52mph showing on the speedo, 1st time i had ever got it off the gauge, i was over the moon. Been running good for 2-3months now but again i noticed i had gradually lost too end till today i went on my test route where i hit 52 and i only reached 45-47? So i had def lost about 5mph. Stripped down the variator and belt and all looked ok. Only thing i noticed was the boss and variator mayne felt a little "sticky" and not as free moving as i would hope. Cleaned it all up and put a very small amount of lubricant on the inside of the boss where it goes round the crank. Went out and my top end was 49- 50 again, a good 4-5mph up on earlier.
This leads me to believe either my boss needs replaced or i need a new variator, anyone agree or disagree?
Since all i did was clean up my old variator and boss and that restored most of my top end i guess the surface of the boss is maybe worn and not as smooth as it should be? or the hole in the variator is worn and unsmooth? I think if i could get some lubricant in there that would stay there and not spin out over my cvt it would be fine but what can i use that will last and not burn off or spray out? As far as i onow you dont usually ever grease the variator or boss so maybe i just need a nice shiney new one?
Just to say also, when i lost top end it would get to 43-44mph then it felt like it was being held back or starved of fuel or air a little, after i lubricated it this went away and my topend returned. Same thing when i replaced my belt, but i wouldve cleaned it all up then too so i think the belt was not the issue, it was the variator or boss or both. I figure the variator is moving in on the boss as i get faster until it gets to 80-90% then its sticking on the boss and not sliding all the way in as it should. Obviously when i clean it up and lubricate it then it helps the variator slide again on the boss and its going all the way over at top speed, so the problem must be with the sliding motion of the variator, right?
