Koso Sucks.

[larryhobman]

Why is Koso sold soo much when it  is not any better than no name Chinese parts.  I order 2 sets of sliders, 4 gram and 6 gram.  The 4 gram weighed in at 5.5 gram and the 6 gram weighed in at over 7 grams.  So not too hard to fix with a dremel and a burr buy why? Also,  my 1000 torque spring did not last but a few hundred miles and now is weaker than the old stock spring that I put back in.  I plan on buying a new 1000 main spring, a cheap blue one.  I tried a 1500 main spring, gave me lots of rpm and good low end but killed top speed by 5mph if anyone was interested in hearing my results.

[ryan_ott]

Koso is just crap with a fancy name that costs more. I think there may be genuine koso and knock off stuff. Yeah copy of a copy. I've had good stuff in years past but earlier this year I picked up a "koso" variator on the cheap to try out. I just threw it out. Wasn't even worth keeping the sliders. The bushing wore and had scratches just from going for a test drive. I've done it in the past and learned from my experiences. Better to buy quality once then to buy crap 3-4 times. The Polini, stage6 and Malossi etc stuff is good for the money. The rollers and springs can be had for similar cost to the cheap stuff and will last a lot longer. All of my weights Polini and stage6 have been within .05gr of the labeling.

[humanshield]

"Is not any better" ? It's actually worse.

I learned the hard way. Even though those who knew better warned me.

You are better off with a stock, Chinese OEM GY6 variator than a DLH or Koso


The one I tried was not even concentric.  The center busing hole was 1/16 OFF CENTER

And be careful, they'll simply change the name HGR or NKX or something and it'll still be the same junk

[90GTVert]

I think it depends what you're buying. Koso gauges seem pretty nice, though I've only owned one tach/temp combo. It actually came with good documentation, unlike most Chinese gauges. I've got some old Koso contra springs and clutch springs that have worked alright for me, though I wouldn't say they're anything special. Their variators are the same as DLH, which is not good.

[larryhobman]

That is what I also thought of DHL when i looked at their variator. I just though i would vent a little in the forum Koso just keeps pissing me off. I am going to stick with no name chinese oem parts for a while. The good name brands polini molassi are too much for me now. Stock variator clutch coil cdi carb all have veen good.

[ryan_ott]

If you catch a sale you can get them for around $45-60.

[Deleted]

Aug 10, 2016 20:06:17 GMT -5 ryan_ott said:

If you catch a sale you can get them for around $45-60.

That's a bit high for me although, I am on my 2nd KOSO variator and if you added them together, then it would come to more than that, ha ha.  There is something about them, ramp angles, whatever, that make my scoot go to high rpm and hold that rpm all the way up to top end.  When my first KOSO variator failed (only like 100 miles on it) I put a new, stock variator on my scoot and it worked OK, but, the rpms started low and built up like you were riding a shift bike.  (I used the same sliders)

So, I got another KOSO a few months ago and, I am back to hitting a good rpm and holding it up to top end.  I just wish they were of higher quality components.  If the $70 variators can perform as well AND hold up, then they are indeed worth the money.

Bill

[stoneforth]

I wasn't too impressed with the 4g koso sliders i got. Varied by .2g. I ended up making them into 5.5g with foil