Heres a wierd one to stump you! By redroush00 (Read 482 times)

[redroush00]

Ive been complaining of too high RPMS right? So today I was fooling with the enricher to see if there was an easy way to delete it and discovered my socket is part of the carb housing and no way to get a gasket behind it so i scrapped the idea yada, yada, yada...so I then put the rollers i like back in and figured ill live with the 8000+ rpms for a day or so.

I get on the scoot and immediately notice a drop in the overall rpms by a factor of 1000! Im like ?? I checked the tach and it seems fine. The idle rpm hasnt changed and the rpm curve seems similar as well. I can also hear that the rpms are not screaming. So i ride and the aceleration is about the same but the rpms are much lower. Top speed is down a hair but nothing significant.

So i back track to see what i could have done to effect this sudden change. Bear in mind the rpms are about where i want them in the first place but a sudden change without changing something to facilitate that change means something is wrong. Even though the rpm curve is similar its just overall lower. 35 MPH is now 7200 rpm instead of 8200

The only thing i noticed are that the air box has ALOT of oil in it and probably a good bit on the filter. Its a type 2 filter that has a paper element sanwiched between a piece of metal with holes and a sponge on the back side. I cant tell if the finlter is soaked but im trying to dry it over night. I could have moved the oil revovery lines while messing in the compartment and somehow causing the oil in the collection tube to go into the tube that connects to the intake tube on the airbox?

The only other thing i did waqs use my new impact to tighten the variator nut. Nothing extreme but about as tight as when i used the open end wrench trick. i visually watched the clutch and variator open and close smootyhly on the center stand. I cant see that causing a problem. I double checked the wiring connections especially the choke and all was well.

So everything works fine. It starts, idles, rides just like before...Its just that the rpms are 1000 or so lower.

Any ideas?

[Guitarman]

Three thoughts on this....

1. Prayer works.
2. Magic.
3. When you did the variator and changed rollers, you knocked something loose that had been jammed and now its working correctly and that in combination with the new weights gave you the RPM reduction.

[redroush00]

Number 3 is a good guess but I have been messing with rollers and sliders for 2 months and never got more or less than a few hundred RPM change at a time and the rpm curve would change as well. Im thinking magic at this point because its kinda where i want it! I cant rev past 7500 full out now with 5 gr rollers but that nagging feling is still in the back of my mind....whats broken...

[Alleyoop]

What rollers where in there and what did you put in?
Alleyoop

[redroush00]

5 gr rollers i had in there a few day last week then i put my 6 gr sliders in over the weekend and switch back to the 5gr rollers today. I would look twice if were sliders in there and maybe in wrong but the 5 grams worked fine then just lower rpms now. There was only a few hunded rpms difference switching from the rollers to the sliders the other day and not its a lot more!


This is a pleated paper filter in the box. If enough oil got on that that could effect the higher rpm range right? Almost like its running too rich?

[Alleyoop]

That drastic change in RPMS with the same rollers as before and it was pumping out to 8K and now 7.5K I would guess the last time you put those 5g weights in the Nut on the Crank was tightened up on the splines of the crank and not the Variator. That would allow the Variator to move out a hair and would keep the belt lower at higher speeds allowing for more rpms.

Now with the change the Variator Nut is Actually tightened on the variator Fan Plate and pushed it in a hair and now lowered the rpms due to the belt climbing little faster.
Alleyoop

[Guitarman]

Nov 13, 2013 20:27:31 GMT -6 Alleyoop said:

That drastic change in RPMS with the same rollers as before and it was pumping out to 8K and now 7.5K I would guess the last time you put those 5g weights in the Nut on the Crank was tightened up on the splines of the crank and not the Variator. That would allow the Variator to move out a hair and would keep the belt lower at higher speeds allowing for more rpms.

Now with the change the Variator Nut is Actually tightened on the variator Fan Plate and pushed it in a hair and now lowered the rpms due to the belt climbing little faster.
Alleyoop

That's what I said. Or meant.... more or less... LOL

[redroush00]

You're a genius...i think. Not real clear on what you said but remember about a week or so ago i asked if we need the little washer in front of the nut? Well i lost mine and have my variator on without it. i then got one from the hardware store and put it on. When i looked at it i did see some marring in the surface of the splines in about 1/8 of an inch or so. Is this what caused it? Is it that i used an impact to tighten it with the washer? Have i ruined it? Can i get it back? The arrow points to the effected area.

Should i just remove the washer after all to get it back to where it ran best at? Or should i just consider this the actual true rpm now and tune from there?

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[Guitarman]

Yep, Alley is a scooter genius.

Are the splines messed up? If so, how badly? If it's not too bad, then I wouldn't worry too much. Just keep an eye on it for a bit and as long as it's doing what you wanted....

Of course, I could be totally wrong. We'll see what the brain has to say. LOL

[redroush00]

Maybe an 1/16 of an inch on the spline? I think everything still has room to sit where it needs to sit.

[Alleyoop]

RED,
Now I remember you where the one with the washer question. And yes that would cause what just happened to the rpm change. I do not believe the splines are ruined they only stick out about 1mm and if you can get the Variator on and off and the Variator DOES hold onto the Splines on the crank your golden. So now my friend if you want the 7.5 grams back WHEN the Variator with the washer are on Correctly GO UP 1 Gram on the ROLLERS or One Gram on the Sliders. Your RPMS should drop to mid 7K and you might even gain 1 or 2 mph more but you will not loose any.
Alleyoop

[redroush00]

Gotcha. Now i know what caused it. As it sits right now what can i do to fix the fitment on the variator? Im asuming somethings wrong if the rpms are still low. Is it too tight now? I cant imagine it any tighter than the factory jack hammer installation. Or is it not tight enough since you cant really gauge torque with these electric impacts?

[Alleyoop]

Right now if it is revving up to 7500 rpms with the same weights when it was revving 8000 your golden, do nothing the Variator is on right. Why it was revving 8000 before is because the NUT was not tightening on the Variator BUT tightening on the splines and that left 1 mm for the Variator to MOVE out making the space in between the pulleys wider which got you higher rpms because the belt would not go as high.
Alleyoop

[redroush00]

Alley for President!!!!!

Man I thought I broke my scooter lol!

[FrankenMech]

Hell with the President, we should make Alley EMPEROR!