. By rosiemoto (Read 11,522 times)

[rosiemoto]

Definitely will do!

Hey I saw in my email a message from you, but I can't find it in here? Really curious what you were saying. This is what I got:

Rosie, when you get on it and are ready to take off slowing give it throttle and notice the RPMS when it actually starts to move you. If they are over 2500 you can take the OLD CONTRA SPRING from the...

[Alleyoop]

That was to determine how strong the contra spring is compared to the old one. New ones will take more rpms to move the scoot until they break in few thousands of mile.

What I was saying is starting off slowly twist the throttle and notice what the rpms are before the scoot actually starts to move. And if to high you can swap the old contra spring from the old clutch and the scoot will start to move at a lower rpm. That is if you care about the rpms at takeoff.
Alleyoop

[rosiemoto]

Oh okay, thanks for the tip!

[rosiemoto]

Just did a few top speed runs. Currently Koso variator + 107mm fan + 12g Dr Pulley sliders.
Something's acting really weird... First 2 runs I BARELY made it to 57mph. Then about 15 seconds after the second run I was cruising 45mph, decided to pull it again, and it very quickly/easily got up to 61mph??? It then stayed there at 61mph @ 7.1k rpm until I let off. Then, on another ride I was going about 40mph, accelerated WOT, and it seemed to struggle to get to even 50mph. It WAS a little windy (12mph wind) out there, so that could be something, but my best top speed run from a couple months ago was in worse wind and I was getting consistently 59 against the wind, 61mph with... though it was colder out then...hmm...

Could this be something to do with the new clutch, or the contraspring being new that you were talking about Alleyoop?

Oh and I just received the variator fan. Unfortunately the holes are too small for the variator holding tool I have...again... seems that's just how they make them? Everything else is fine on it and it matches the Koso's pulley size. So I went to Ace Hardware to get materials to build my own variator holding tool and a guy there was nice and built me a really simple spanner tool that fits it. Looks to me like it'll work just fine, was only ~$4 total for the parts. I'm still going to hold off until I do another top speed run on a NON windy day just to rule out the possibility that it was just the wind.

[Alleyoop]

8+ mile per hour winds expect to loose a lot of speed if it is hitting you head on its like putting on the brakes. The windshield and your body takes a lot of wind and slows you up quite a bit. You can see a little difference if you bend over to get out of the wind and you will see a difference.

Also keep this in mind If it is cool outside ALL MOTORS make a little more power, if it is hot ALL MOTORS loose power. Now with the new cars they compensate by retarding and or advancing the timing on it as well as adjusting the fuel ratio to not loose so much power in the heat.
BUT the scoots we do not have that luxury you set the carb to run good and loose or gain a little depending on the weather changes.
You will find riding in the evening after the sun goes down the motors make a little more power and you will notice your scoot a little more peppy.

From your runs your scoot is running good and you will find that it will not run good everyday, some days less power some days more power even on a given day you may notice a change in power. All depends hot the motor is getting. It all depends on how much wind is reaching it to help cool things down.
Alleyoop

[rosiemoto]

Did another 3 top speed runs just now at midnight. No wind, and much colder out... still can't top 58mph no matter how long I held it wide open. It's being STUBBORN. I tried feathering the throttle... didn't help. It did feel really fast 0-40, from the cold weather like you said, but top speed is still being limited somewhere. I'm pretty convinced that's the best I can get on this particular setup, so tomorrow hopefully I'll put in that new 115mm variator fan and give an update once I test ride. I hope this very simple DIY spanner works.

I notice whatever speed my bike decides to hit 7.1k rpm, it STOPS RIGHT THERE, always. When I had the old stock belt, it did 45mph at 7.1k rpm, and that's where it stopped too. I wonder why it won't rev past that?

I still feel it "jump up a gear" when I let off the throttle. New belt improved/lowered RPMs all around, but everything after ~43mph feels a little too light/belt not being pushed out all the way.

[cyborg]

Check your tire pressure lately?,,,also how's the shaft and all sliding surfaces look in the variator? Also are you sure the belt is the correct length? Just a tad shorter won't let it climb the drive face as high,,,

[rosiemoto]

Good idea, I was actually wondering about that! I've been having my front tire at 30 psi cold, but the tirewall says 32 max. I feel it's a bit loose/hard at 32 but I'll definitely try topping it off to that and give it another couple runs. My rear is always at the max pressure of 33. 

Only thing I can think about the shaft is a few months ago it had a "ring" and the drive boss had some burrs so I sandpapered those until it all spun freely again.

The belt as far as I know is the right length... it's nice and tight in there. Just put a new one in some days ago. Same brand as the old one I had that has been abused and stretched, and that one was able to get me 61mph consistently when it was new. This current belt I just put in was stuck bent in the strange shape it shipped in though, not sure if that matters... but it seems to be working fine. I did notice there's a difference though in the shape of the teeth on these Gates belts vs the stock belt. The stock belt has bigger teeth/grooves... I wonder if that makes it ride higher?

This looks just like my stock belt, but the chinese brand name is slightly different: www.ebay.com/itm/NEW-842-20-30-CVT-DRIVE-BELT-FOR-SCOOTER-/291067858305?hash=item43c4ff0d81:g:GOEAAOxyOMdS6ETz&vxp=mtr

[rosiemoto]

Alright I just put in the 115mm variator fan. From revving it on the center stand, it looks like the issue with the belt "shifting up" on deceleration is gone now! The belt rides pretty close to the edge now after enough speed is built up, and if I let off the gas, the belt doesn't upshift, yay! RPMs seem to have been lowered some too, but I haven't ridden on it yet so I can't say yet my RPMs.

Unfortunately Alleyoop, I didn't do the marker test because I wasn't sure I'd be able to get the fan on since my tool wasn't fitting it. So you may be wondering how I got it on. Well that DIY spanner I posted a picture of a few posts ago, didn't work as planned either. Since it went straight across, it blocked the wrench from being able to get in. I got determined to figure out a way to make it work somehow, and I did! One screw went in a variator hole, and the other screw went against the outside edge of the variator, with something in between to protect from scratches. Worked perfect for torquing the nut to my usual 27 ft/lbs. Yay for $4 DIY spanner! See for yourself:

First picture is showing "oops... didn't think of that..."


Second picture is how I positioned it to hold. This trick gives room for the torque wrench to go to the nut. Just hold the spanner with one hand, and torque wrench in the other:



The trick is to position it in such a way that the screw at the outside edge is being rotated toward the variator. It must be a screw long enough to reach at least slightly past the edge. The variator naturally stops the spanner from rotating any further because IT'S there in the way. Both screws were positioned 8cm apart, or basically whatever space the holes are.

[cyborg]

Pure genius ,,, there's a piston right there

[Alleyoop]

Bummer that is to bad you should have marked the OEM before taking it off and run it at WOT and see how much of a mark was left.
Then Mark it again opposite the first Mark put on the bigger fan and run it at WOT and see how much of a mark was left.
Then you could of actually seen if the bigger fan did anything or not.

Yep, that is why when you make your own you have to make it like this:
Alleyoop

[rosiemoto]

Does having freeplay in the throttle affect how fast you can go? Wondering if my throttle's moderate amount of freeplay is limiting the throttle from going all the way wide open?

[Alleyoop]

If there is to much free play YES it will effect how much the BUTTERFLY is opened.
Normally 1/8-1/4 of an inch is all the play you should have before it actually pulls on the cable to open the butterfly.

But to test it, grab the Throttle wheel at the carb and turn it clockwise all the way HOLD IT THERE and now with the other hand grab the throttle handle and twist it all the way. NOW pay attention to the throttle wheel and let go. IF IT MOVES when you let go then you have to much play and may be loosing top end speed.
Alleyoop

[rosiemoto]

I did the test and it seemed not to move after releasing my hand on the butterfly at wide open. I tightened it up anyway and then started noticing it clicks (hitting the stopper I assume) at wide open. I didn't notice if it did before, but at least now it definitely does. I might need a new cable sometime soon I'm wondering, because I seem to really have the adjuster pretty far down.



I found a missing clamp in the carb area! What does that hose do?

[Alleyoop]

Those two hoses are VACUUM hoses VERY IMPORTANT that they are not leaking as well as the hoses connected to them. The one you pointed to operates the ACV valve on the side of the carb and the other end probably looks like it goes to your PETCOCK which operates the fuel flow.

The other hose most likely goes to a canister your scoot has some emission system, probably a EVAP Or PAIR system. If your VALVE cover has a CHROME pipe in front of it you have a PAIR system if the canister has a hose going to the top of your tank it has a EVAP system.
Alleyoop

POSSIBLE EMISSIONS:
scooterdoc.proboards.com/thread/9153