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 I need help tuning zuma, Whats your Full tune on 70cc 
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Newb
Newb

Joined: Thu May 26, 2016 10:09 am
Posts: 8
Post I need help tuning zuma, Whats your Full tune on 70cc
Hi I have a 2003 Zuma that has a
sport 70cc kit, leo vince tt, Polini Variator, Carbon fiber Reeds

(tuning)
95 Main jet
2 quarter sized airbox mod holes
6 gram sliders

It currently drives slow at acceleration at 0-20km/hr after it shifts to super awesome fast acceleration to 75km/hr
then slows goes up to 80, Around 9700+ rpm, which i usually back off as i don't wanna blow up the crankshaft past 10,000 rpm

What do you expect the problem to be??? Im trying to at least hit 100km/hr
I try tuning my idle mixture, tried to move the clip on down (causing even more 0-30 km/hr slow acceleration) hasn't worked
Should I use lighter sliders? or Heavier Sliders?
Do I absolutely need a new Clutch spring or contra spring?
The graph recommends around 8500 rpm but my full throttle goes 8800+ rpm does that mean i should do heavier rollers?
Does the 8 pound storage rack slow your scooter?


Also Please post your speed, modifications, and tuning setups Thanks


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Thu May 18, 2017 11:36 pm
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Scooterologist
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Joined: Fri Jul 29, 2016 7:46 am
Posts: 82
Post Re: I need help tuning zuma, Whats your Full tune on 70cc
If it were me I would ditch the holes in the air box, I know I know, it seems stupid to restrict an air box but understand these scoots act real funny when it comes to the air box. I would also try ether stiffer springs in your current clutch or just shell out the dough for a malossi delta or S6 adjustable clutch. I know with my bike, I could never get it close to the optimum rpm for max torque off of the line with the stock clutch and the stiffest polini springs for the pipe I was running. Also it could very well be your pilot jet being to rich. The Leo tt has great rep for being pretty easy to tune for and seems to have great torque, so you may be able to get away with just stiffer springs, and like I said if it's not that, then it's your carb or rollers. You may also want to get lighter rollers and try them as well. Take a marker and mark the variator, make a line from the bushing all the way to the top and do a wot run then inspect the mark you made, and see that the belt is starting at the very bottom and running all of the way to the top. If the belt is not staring in the lowest position of the variator then that could as well cause you an issue with acceleration. If this is the case, you may have to shim your variator. Also you should be ok with a medium torque spring, to stiff and you will stay in first for to long, to soft and you will not stay in first long enough. I hope this helps you some, and let us know how everything goes.

_________________
09 Zuma Black
Athena 15/50 up gears.
Malossi Delta clutch-soft springs-middle spring position-light weights.
S6 19mm PHBG MKll carburetor- polini 86 main-S6 40 pilot-2nd notch up on needle.
Milled case @ oil injection pump for stainless block off plate.
Pre mixed Klotz R50 40:1
E-start delete block off plate stainless.
S6 Enrichment lever and cable.
Piranha quarter turn twist throttle assembly.
Scoot Tuning Single throttle cable conversion.
Malossi carbon reeds .35mm.
S6 Street race mkll 70cc kit .75mm squish.
NGK BR9HS.
Stock air box and filter with snorkel removed.
S6 Pro Replica exhaust.
S6 Sport pro variator-Malossi HAT Rolls 16x13 5g rollers.
S6 black medium contra spring.
Modded vented air shroud painted corsa red with TNT tuning air scoop.
Tun'R bars and stem.
Pro grips 838 grips red.
Scoote Tuning bar end mirrors.
Stage 6 all in one digital speedometer.
BWS tail section with integrated indicators and license plate light.
Custom made side stand
Dual headlight mod
Tun'R tear drop front turn indicators
polished and vented trans cover


Fri May 19, 2017 2:37 pm
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Newb
Newb

Joined: Thu May 26, 2016 10:09 am
Posts: 8
Post Re: I need help tuning zuma, Whats your Full tune on 70cc
So I changed the jet to 90, closed off one air hole, change rollers to 6 grams.
Seems a lot better, still adjust idle mixture yet, but acceleration goes to 7600+ rpm after steadily increases to 9600+
I thinks thats as close as I can get to consistent 8500, I tested the ride and it seems like 8700 is the sweet spot
for HP, but since my crankshaft is stock I think starting at 7600 is fine. I don't wannt be looking at my tachometer all the time.

May have to upgrade clutch springs or torque spring. when budget allows.

Thanks for the Tip about, Marking the variator. Ill try it.
Tuning is Zuma is Fun but also maddening Haha! :toot: :toot:


Sun May 21, 2017 9:57 am
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Scooterologist
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Joined: Fri Jul 29, 2016 7:46 am
Posts: 82
Post Re: I need help tuning zuma, Whats your Full tune on 70cc
Glad to see it's heading in the right direction, they can be a bit tricky to tune, but when you get them all sorted out that's when you finely get to see your money put to good use. Pleased to be of help bud, if you need anything else don't hesitate to ask. Oh and ps, the stock crank is ok at 11 to 11.5 all day. I had mine hitting 12k and its held up so far. So I would say your well within the safe zone.

_________________
09 Zuma Black
Athena 15/50 up gears.
Malossi Delta clutch-soft springs-middle spring position-light weights.
S6 19mm PHBG MKll carburetor- polini 86 main-S6 40 pilot-2nd notch up on needle.
Milled case @ oil injection pump for stainless block off plate.
Pre mixed Klotz R50 40:1
E-start delete block off plate stainless.
S6 Enrichment lever and cable.
Piranha quarter turn twist throttle assembly.
Scoot Tuning Single throttle cable conversion.
Malossi carbon reeds .35mm.
S6 Street race mkll 70cc kit .75mm squish.
NGK BR9HS.
Stock air box and filter with snorkel removed.
S6 Pro Replica exhaust.
S6 Sport pro variator-Malossi HAT Rolls 16x13 5g rollers.
S6 black medium contra spring.
Modded vented air shroud painted corsa red with TNT tuning air scoop.
Tun'R bars and stem.
Pro grips 838 grips red.
Scoote Tuning bar end mirrors.
Stage 6 all in one digital speedometer.
BWS tail section with integrated indicators and license plate light.
Custom made side stand
Dual headlight mod
Tun'R tear drop front turn indicators
polished and vented trans cover


Sun May 21, 2017 5:34 pm
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Forum moderator
Forum moderator
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Joined: Thu Mar 20, 2008 5:27 pm
Posts: 14622
Location: portage wi
Post Re: I need help tuning zuma, Whats your Full tune on 70cc
First question what carb are you running I'm guessing oem because you didn't say what carb
Second question what brand jets I'm guessing not oem because there is no such thing as an odd numbered tk jet if you are running the stock tk read my thread why use the right jet throw away the jets you have and order and 82 and 84 oem from yamha and plug the holes in the air box because you can't tune an Oem carb to run right because you can't get pilot jets for them to tune the low part of the throttle

_________________
2008 zuma dual headlight mod koso mirrors liquid cooled polini corsa kit leo vince zx stage 6 variator rally kit custom red paintFUEL INJECTEDsoon to be 100cc
2008 stella olive custom ported 177 cc kit dechromed ford tear drop tail light alive and breathing and awaiting cosmtic surgery thanks to an donkey hind quater hole cager
1985 elite 150 how long can i leave it stock


Tue May 23, 2017 5:07 pm
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