New varitor, smaller sliders dimensions, but heavier weight?

Hi guys, my Dr Pulley Variator and Clutch have arrived Today. I understand that the variator has different dimensions compared to the stock one. Stock (21x17) and dr pulley (20x15). I currently run 10g stock sliders and have wicked acceleration but it gets tired past 72mph but still hits 88mph or so when flat out.

Dr Pulley Variator comes 12g and 13g sliders. I am wondering if I should but 10g again or maybe they are the best weights to use on my model to achieve best acceleration/speed combo (as in lighter will be too snappy to ride...

The whole ride is going to change with the Variator, Clutch, x kev belt and new speed bell so simply put it, there is no answer and it is just about finding the sweet spot between the variator and clutch set up more than anything else? Oh! and dropping into a mechanics who deal with scooter mods and this kinda thing is common as muck for them. Will let them keep it and test it till it runs smooth.

 

Well here they are! Installing the lot next week.

 

Tell me about the Dr Pulley clutch when it's on. I still haven't found the perfect clutch. Malossi, Polini, Artek - they all have good & bad points. I just can't find one stiff enough (wup wup, ag ag, fnarr fnarr etc)

 

Will do. Hopefully it will be noticeable but also installing the new variator at the same time so the whole ride will be a big change. But supposedly through its design it grabs the clutch bell super tight and eliminated any slippage. Getting work done on Monday, hope to have it back by Tuesday afternoon so will post up then.

 

I want more slip, not less ! But only at the start.

 

can you explain why you want more slip? I though that slip was less power being transferred....

 

It's all about the torque curve. You can't transmit power if there isn't any (at low revs). With a peaky engine - you need a stiff clutch ! If the engine can't get up to speed - it won't pull. Clutch slip is a myth. Once the engine is at 13000 rpm - the clutch wings are welded to the bell.
You need more slip, not less.

 

Okay. So first drive after installing the Dr Pulley variator (12g sliders), hit clutch, polini speed bell and malossi x Kevlar belt. Keep in mind my original set up with everything as stock except 10g sliders was awesome. So I thought that all these performance parts could be better again. Here we go

First thing I noticed was I could hear the Clutch and the bell engaging, a noticeable clink when I engaged the throttle which I was informed was normal. Secondly, ''THE REVS''. I gave it a full twist from go and with a little hesitation the rev counter flew into space. It flew up to just under 9k revs and was moving slowly up as I gained speed and it sounded insane. More like a high pitch 2t engine noise rather than the deeper sexier 7-8k rev range sound. And my oh my did the speedo fly up and you could feel the whole thing pulling hard!

I gunned it from a red light and it felt like all power was lost when I hit about 50mph.... like it was out of breath. It seemed to be rising very slow, noticeably slower than my original set up. This I have to investigate more.

My scooter also seems to be vibrating a good bit more which is strange...

So I don't know yet. I am not mechanically minded and I don't do taking scooters apart etc. So I was hoping that it would have been as simple as 'plug in and play' without having to adjust.

I am not getting butterflies after my first drive. The extremely revvy nature of it now is a bit much, also very noisy. Maybe I should look into 14/15g sliders to try get the insane revs down and spread out the power curve?

I wasn't expecting that first experience to be as it was. I thought the whole set up would have given me more (not huge) amount of extra torque and the power curve wouldn't feel like it died off that early 50+mph.

Should I go 2-3g heavier as the revs are going very high? Will this help space the gearing allowing a more spread power distribution?

 

I would leave the clutch, increase roller weight a little - and keep a very close eye on the colour of the spark plug - maybe upjet 2-5 points. I like the sound of the clutch ! I'm interested.

 

a little as in install the 13g? It is just revvy as F***. Maybe 14g the way to go? Have to learn how to take the transmission apart as relying on mechanic is slow and very expensive. Worst case scenario. I re install my stock variator if I can't get the revs down.

13g might only drop it a 200-300 which is still running way too high for the bike to handle.

 

I have no idea - as I don't know the variator. If you think 14 will work better - I would say 'trust your instincts'. Sounds plausible to me. Watch the plug !

 

So after a good sleep and a morning of driving I do believe that my sliders are too light. Ordered 14's Today from sip scooters as I don't believe 13's will change it enough to notice. All power is lost after 8.5k revs so full throttle is over 9k so it sounds like heavier is the cure. I knew that the Dr pulley Variator was "more revvy" but I have faith i can get it running fine. Only concern is if 14g may cause rubbing of the belt and casing...

Turbovetto, do you think it is necessary to re-jet as I am not messing around with the carburator? The clutch is wow! Now I am saying this without testing it on its own as I put the new variator and clutch in the same time but I think a little tweaking and I can have great acceleration and I hope to get my revs down at least 1k I hope...

 

Picking up my scooter in a few hours with 14g sliders being put into the Dr Pulley variator and removing the 12's. I am hoping this will drop the max revs from 9250 down to 8500 (hopefully). Will also be able to tell if the belt is rubbing the casing. I think both spacers have been installed in the variator so there shouldn't be any problems, although the malossi belt is thicker so.... 14g will ride up higher so will check back in a week to see if they are acting up and hopefully they are the perfect weights to use.

Overall, the set up makes the scooter goes like the wind!

 

So I have taken it for a long drive and maxed it out. Here are my findings.

(Stock gilera runner st 200 stats with Akra exhaust pipe)

0-60kph (37mph) 4.4 seconds
0-100kph (63mph) 11 seconds
Max Speed (88mph)

With performance parts *Dr Pulley Variator, Hit clutch, Malossi x kev belt, polini speed bell and exhaust*
0-60kph (37mph) 3.5 seconds
0-100kph (63mph) 9-9.2 seconds
Max speed (94mph) Gained 6 mph with heavier sliders.

Take off is unbelievably smooth, smoother than before with the 12g. The clutch kicks in faster and the pull is felt immediately. Not forgetting to mention that even when you engage the throttle hard even at 63mph you get a strong pull. Like I said, the clutch is fantastic! 12g sliders were way too light. The clutch prefers heavier ones. No loss off acceleration and to be honest, I felt that it is quicker even though I put in heavier sliders...

12g sliders max revs 9400, engine tires out around 64mph
14g sliders max revs 8600-8700 engine keeps pulling as it is sitting on its max power @8750rpm

Overall, it feels so much more responsive and it definately has very noticeable improvement in grunt. The Hit Clutch is beyond amazing. I recommend it as a must!

 

Interesting ! Thanks for the write up. I feel some expenditure coming on.....