Need Tuning Help 70cc Kit Installed

[jimfj]

Malaguti F-15 liquid cooled
NCY 70cc kit
Stock pipe
Stock Transmission.

I got the kit installed and then found out I needed to replace my water pump. Thats done.

Soooo,

I finally got to ride the scooter for the first time and found that the 70cc kit was revving the thing way too high.

Checked all the factory restictions and found that everything was done except the "wedding band" in the Variator.

Now I have a scoot that will hit pretty close to 60 (Scoot Speedo) on flat and pull 40 going up a decent hill.

I am thinking that the rollers (stock) and clutch springs are in need of changing. I have to change the rollers because they have some wicked flat spots. I need reccomendations for the roller weight and do I need to change the springs?

I haven't messed with all this before and am looking to save some time. I am not looking for all out top speed. I would like it to launch nicely and pull hard to 10,000 rpm. If 10K equals 55-57 mph thats fine.

The way it is now, I don't believe I can get it to pull 10,000. Before I took the band out of the variator it would hit 11,000.

The clutch currently engages at something like 4500-5000 rpm if my digital tach is correct.

Thanks in advance,

Jim

[90GTVert]

Use your previous experience to choose rollers. If you think it's revving too high, get slightly heavier weights than you had. If you think it's not revving enough, get slightly lighter weights than you had. Pulling the ring from the variator lets it close farther, so that's why your RPMs drop. Just going from what you've told us, I'd guess you'd want weights just a bit lighter.

If you feel like it bogs on initial launch, replace the clutch springs with stiffer ones. For example, if the clutch engages at 5000 and you don't start making decent power till 6000, you want to get stiffer springs so you can start out in the power instead of waiting for it.

[jimfj]

here is the where I am now.

I have installed 5 gram rollers with the same setup as before.

I am getting a great launch. the clutch engauges at 4500 rpm and the engine zips to 9000 rpm. Perfect.

If I continue with full throttle or there about, the rpms will drop to 7000/7500 and the speed will continue to climb till i'm at about 55-60 mph. Wind affects this and so does a grade. Uphill is about 40-43 at WOT.

If i'm thinking correctly, the scooter is dropping out of its power band after the initial launch and is climbing slowly out.

Any ideas to keep the power consistant. It is very ridable but with the extra cc's I would like to have more on tap to be able to "pass" someone.

A last thought. I took the ring out of the variator, would putting it back help or am I going to lose my top speed? Or should I just stick with roller tuning. If so which direction should I go with weights?

Thanks

[90GTVert]

Taking the ring out of the variator will help your speed. The only reason to put it back would be if launches suffered too much, but it doesn't sound like they have.

An aftermarket torque driver might get what you want. Something with a straight groove instead of a dual angle groove. The stockers shift angles for the effect of a high gear and that's when RPM drops, usually somewhere around 30-40MPH.

If you are pinning the throttle and the RPM only shoots to 9000 and then immediately down to 7500 you might want to see if slightly lighter rollers would help.

It's normal for headwinds and hills to drop speed unless you've got a pretty beefy setup. We're dealing with small engines.