pewpew
Scoot Enthusiast
Posts: 254
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Post by pewpew on Aug 2, 2020 18:07:14 GMT -5
I built this 86cc yamaha aerox and would like to know how to get it faster. The cylinder and cases are ported, but the exhaust is very bad (temporary) and the intake manifold has a big step so i would like to know what to know to get it faster. Currently does 121kmh/75mph. Maybe different intake, exhaust and smaller carb? Rest of the setup: Top performances 86cc cylinderkit & crankshaft Yasuni city 16 exhaust (got it for 20€ temporarily, waiting for a exhaust flange to roost exhaust) Stage6 vforce3 reeds Stage6 rear facing intake Stage6 subframe Stage6 32mm pwk carb & air filter Malossi mhr la furia rossa variatorkit Stage6 clutch & bell Doppler gearing      |
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pewpew
Scoot Enthusiast
Posts: 254
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Post by pewpew on Aug 3, 2020 7:32:19 GMT -5
What is this spacer used for in the malossi overrange kit? Works fine without it  |
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Post by Lucass2T on Aug 3, 2020 9:01:02 GMT -5
In what way you want it faster?
Higher top speed? Quicker 1/8 mile time? More hp?
That 32mm is overkill i can tell you.
Also, remove the step in the intake.
The carb is under a huge angle, never been a fan of those setups. Id rather flip it 180 degrees so that it faces forward.
Post the current transfer timings.
What kinda base gasket are you using?
Squish?
I can't really tell how and with what precision you've built your engine, maybe you can gain some there.
There's no info on tuning.
We need more info to be able to help you.
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Post by Lucass2T on Aug 3, 2020 9:02:16 GMT -5
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pewpew
Scoot Enthusiast
Posts: 254
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Post by pewpew on Aug 3, 2020 9:39:56 GMT -5
In what way you want it faster? Higher top speed? Quicker 1/8 mile time? More hp? That 32mm is overkill i can tell you. Also, remove the step in the intake. The carb is under a huge angle, never been a fan of those setups. Id rather flip it 180 degrees so that it faces forward. Post the current transfer timings. What kinda base gasket are you using? Squish? I can't really tell how and with what precision you've built your engine, maybe you can gain some there. There's no info on tuning. We need more info to be able to help you. more top speed and faster acceleration, i think im gonna get 28mm keihin pwk and new same intake with no step. 194/130 cylinder timings, i didnt measure squish because the kit came with only 1 base gasket. it should be 0,9mm. I dont think i can change the direction of the carb |
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pewpew
Scoot Enthusiast
Posts: 254
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Post by pewpew on Aug 3, 2020 9:40:29 GMT -5
i did read the whole thing yesterday  |
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pewpew
Scoot Enthusiast
Posts: 254
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Post by pewpew on Aug 3, 2020 9:43:38 GMT -5
im currently having a little problem, the scooter works fine at high speeds but when i slow down it starts to be very rich. i think the main jet is too big? it starts working when i bounce the scooter alot youtu.be/jauTmlpPM7I |
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Post by Lucass2T on Aug 3, 2020 10:00:33 GMT -5
im currently having a little problem, the scooter works fine at high speeds but when i slow down it starts to be very rich. i think the main jet is too big? it starts working when i bounce the scooter alot youtu.be/jauTmlpPM7IYou know, that might be that carb angle I was talking about earlier. Did you adjust the float according to this steep angle? Those PWK carbs are designed to be mounted horizontal, not under a 45 degree angle. Look up the minarelli based scoots that race in the italian Polini cup, you'll see non of them have the carb under such a steep angle.   |
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Post by 90GTVert on Aug 3, 2020 10:08:13 GMT -5
What is this spacer used for in the malossi overrange kit? Works fine without it None of mine ever came with the thicker black spacer shown. The thin spacer that comes with an OR kit is usually for the clutch bell. Goes on just before the bell to space it out a little and keep it from binding up. Re: getting faster. You're already faster than me by 1-2MPH with a pipe that isn't going to max it out, so I dunno. I had a pipe that peaked 10-11k and moved to the 13-14k MHR Big Bore and it definitely picked up power and speed. It makes the whole thing more aggressive, so you've probably got a better scoot to ride with the C16, but you'll have something more fun to play with using a hyper race exhaust. My squish was about 0.2mm wider than TPR suggests (1.1mm for me, 0.9 according to them). I have 190/130 port timing out of the box and didn't want to change that so I shaved 0.2mm off of the inner part of the modular head on the mini-lathe. You do run the risk of causing sealing issues if you take too much off, either from poor surface finish/flatness or by changing how the o-rings are compressed, but 0.2mm had no negative effects for me. No big gains either, so I'd say if you can do it easy enough then go for it. If not, don't sweat it too much either. Can't really see what your throttle hand is doing in the vid, but if that's you trying to take off then it definitely has some trouble. If it's fast enough to do 75WOT, I don't think your main jet is likely off that far. You may need to work on the needle and needle settings as well as pilot/idle mix screw. I've been paranoid about leaning mine out, so I kinda just lean it out until it works pretty well and don't worry about any optimal part throttle tune. To me, optimal with these 2Ts is rich because we don't need holes in our pistons... and let's face it, we're not riding around with a race kit looking for the best fuel economy anyway. |
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pewpew
Scoot Enthusiast
Posts: 254
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Post by pewpew on Aug 3, 2020 10:31:42 GMT -5
What is this spacer used for in the malossi overrange kit? Works fine without it None of mine ever came with the thicker black spacer shown. The thin spacer that comes with an OR kit is usually for the clutch bell. Goes on just before the bell to space it out a little and keep it from binding up. Re: getting faster. You're already faster than me by 1-2MPH with a pipe that isn't going to max it out, so I dunno. I had a pipe that peaked 10-11k and moved to the 13-14k MHR Big Bore and it definitely picked up power and speed. It makes the whole thing more aggressive, so you've probably got a better scoot to ride with the C16, but you'll have something more fun to play with using a hyper race exhaust. My squish was about 0.2mm wider than TPR suggests (1.1mm for me, 0.9 according to them). I have 190/130 port timing out of the box and didn't want to change that so I shaved 0.2mm off of the inner part of the modular head on the mini-lathe. You do run the risk of causing sealing issues if you take too much off, either from poor surface finish/flatness or by changing how the o-rings are compressed, but 0.2mm had no negative effects for me. No big gains either, so I'd say if you can do it easy enough then go for it. If not, don't sweat it too much either. Can't really see what your throttle hand is doing in the vid, but if that's you trying to take off then it definitely has some trouble. If it's fast enough to do 75WOT, I don't think your main jet is likely off that far. You may need to work on the needle and needle settings as well as pilot/idle mix screw. I've been paranoid about leaning mine out, so I kinda just lean it out until it works pretty well and don't worry about any optimal part throttle tune. To me, optimal with these 2Ts is rich because we don't need holes in our pistons... and let's face it, we're not riding around with a race kit looking for the best fuel economy anyway. In the video its full throttle the whole time, when i start to bounce the scooter it starts to clear. After that it works fine. Only does that at full throttle not half throttle. I have changed the needle settings and pilot jets but it wont help. |
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pewpew
Scoot Enthusiast
Posts: 254
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Post by pewpew on Aug 3, 2020 10:32:52 GMT -5
im currently having a little problem, the scooter works fine at high speeds but when i slow down it starts to be very rich. i think the main jet is too big? it starts working when i bounce the scooter alot youtu.be/jauTmlpPM7IYou know, that might be that carb angle I was talking about earlier. Did you adjust the float according to this steep angle? Those PWK carbs are designed to be mounted horizontal, not under a 45 degree angle. Look up the minarelli based scoots that race in the italian Polini cup, you'll see non of them have the carb under such a steep angle. I have changed it many times, if i put it higher it runs out of fuel in long wot. |
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pewpew
Scoot Enthusiast
Posts: 254
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Post by pewpew on Aug 3, 2020 10:40:13 GMT -5
+ i got the exhaust flange for the roost exhaust so i will install it probably today. with the city 16 it does 74mph at 12700rpm. Could have gone just a bit faster if i held it longer.
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pewpew
Scoot Enthusiast
Posts: 254
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Post by pewpew on Aug 3, 2020 15:42:17 GMT -5
Definetly wasnt the main jet, needle or pilot jet. i dont know why it runs so rich
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Post by 90GTVert on Aug 3, 2020 15:46:24 GMT -5
If carb tuning gets nowhere, you can start to think of things like spark plug condition/heat range/gap, any ignition system discrepancies, if anything in the CVT could be causing it to stay at lower revs on takeoff, ignition timing.
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pewpew
Scoot Enthusiast
Posts: 254
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Post by pewpew on Aug 3, 2020 17:59:59 GMT -5
If carb tuning gets nowhere, you can start to think of things like spark plug condition/heat range/gap, any ignition system discrepancies, if anything in the CVT could be causing it to stay at lower revs on takeoff, ignition timing. spark plug almost new, b10eg plug, stock ignition timing. i dont think its the cvt because its running rich |
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