CDI cut or race CDI?

[baddi]

hey, ive tried to de-restrict my agility, and so far its going great, and im hitting 65 km/h.    here comes the problem: when i hit full speed it feels like it did before i cut the CDI, just at higher speed, witch makes me suspect that there is another restriction in the original CDI......
is that false, or will a racing CDI make it go even faster?

[mono]

Did you also derestrict the variator ? Otherwise it might be your engine topping out at a dangerously high RPM...

[baddi]

soon i will buy a malossi multivar (problably before a new cdi). but besides the roller weight, i have removed every restriction ive found and/or have been told of

[streido]

I had similair issues after i did my full de-restrict, most noted going down steep hills when it got to 65ish and felt like it was being held back somehow,does this sound similair to yours?

Ithought it was my jetting was too small maybe so was going to increase it to a #86,had already ordered a race variator tho sotried that 1st.

Anyway,i fitted the race variator and its now much better,no restriction or holding back down hills now,smoother and faster acceleration, no flat spots etc.

Think the standard variator is designed for slower speeds sowas restricting me getting up to top speed,now i can get it just over 80kmh or 50mph down hills,runs between 75-80kmh on the flat, much better.

Heres the variator i bought, was much cheaper than the mutivar. Dont know if the mutlivar is any better,but for less than half the price im happy with the one i got now,see below.

http://cgi.ebay.co.uk/RACE-VARIATOR-GY6-50-KYMCO-BAOTIAN-LIFAN-Chinese-/300540989339?pt=UK_Motorcycle_Parts&hash=item45f9a38f9b
Running 5.5g rollers in mine.

Also dont know if the race cdi makes any more difference from the cdi cut one?I read on some forums it just did the same job?

[baddi]

That sounds like the same issue

i will try investing in a variator before anything elese then :p

[fjoerto]

Anyone tried these race cdi ? Any gain in Km/t?   

[mono]

I've tried the CDI cut and it's as fast as any CDI will ever be, at least in my setup (NCY T2 camshaft) where max. power occurs below 9000rpm.

My CDI had quite an agressive timing when cut, which was on the edge of what the engine will take without detonating, all the way up to 9000rpm, so there's absolutely nothing to gain here by buying a race CDI.

The only thing I can imagine (being a professional electronics guy) is that, when you have a true racing camshaft and have to run at a lot more than 9000rpm, the DC/DC power converter of the stock CDI possibly just can't keep up with the demand because of the high frequency of the ignition pulses. But if you really want to build an engine like that, I strongly suggest buying a two stroke machine for the same power with less trouble...

[streido]

I read loads of posts saying the cdi cut gives the same results as a race cdi, without the costs, so I just cut mine.

Did read a few folk say the race cdi gives a better curve to the power but I cant say if thats true or not. Im just sticking with my cut cdi anyway.

[mono]

It's possible that a race CDI has a slightly different curve, but if your variator is running fine your engine will spend most of the time that matters in a narrow rpm band, and maximum power also doesn't depend as much on a few degrees more or less advance in timing as people selling CDI's try to make you believe. 

It's impossible anyway to design the best curve for an engine you don't know every single detail of...

[woodcutter]

I haven't tryed racing CDI but I think it's not worth the money.
De-restricted one will be fine. Mine was hitting 7500 rpm max when was blocked and 9000 rpm unblocked(measured with rpm meter).
This is optimum for the engine to run as it should.
And it make no difference if I drive downhill or on flat road, I'm hitting max speed.

I had some issue while my original CDI was restricted: on take off from traffic lights, rollers had tendency to stick and stop pushing belt up. Rpm's was going up but no acceleration after 20 km/h. Like revving on empty. I had to twist off throttle a couple of times 'till acceleration was fine.
CDI de-restriction solved the problem and engine had more power.

Anybody had simmilar problem? 

[mono]

Derestricting the CDI is of course no solution to sticking variator rollers, you'd better clean the rollers and grease the torquedrive, you'll be surprised by the difference, even when you thought everything was fine.... 

[woodcutter]

It felt like engine had no power to push rollers up.
Like running on a too light rollers. Engine rpm is high but scooter accelerates slowly.
Obviuosly some power was missing but everything ok when CDI unblocked.
Some extra power needed to push rollers like it should.

I'll try to put some grase on torquedrive and I do regular rollers cleaning or change if needed.
And I use car wash jet and degreaser to clean variator, cvt casing and cover.
I apply some grease on a kick start spring and gear inside cover and on electric starter driven gear.


 

[baddi]

It felt like engine had no power to push rollers up.
Like running on a too light rollers. Engine rpm is high but scooter accelerates slowly.
[...]
 

If the rollers are too light, they lack the momentum needed to push up the belt, and you will need higher rpm's to push up the belt.. in the other hand, too heavy rollers have too high inertia, and will require more power to start moving.

When it comes to rollers, 6g has been best for me, and when i tried 5.5g i lost a couple of seconds in acceleration 0-50 and i lost 20 km/h on the topspeed