Genuine Black Cat Polini sport

[jackmisanthrope]

First start on the Malossi. Sprayed it with a little starting fluid before I put the shrouds back on. It's cold and only getting colder in Ohio today. I'll probably put some plastic back on and call it a day. I upped my main to 100 and my idle to 34, hopefully it's a little warmer after work tomorrow and I can take for a couple rips to get some heat cycles on it and see where I need to go on my jetting.
youtube.com/shorts/2mEFRW_hpn8?si=kVSWqpZRZzdQTOzw

[jackmisanthrope]

Working on getting this carb dialed in. I feel like I may need to go to a fatter needle. I can ride around town (stop and go) no problem. My problem arises when I try to go a distance at a constant throttle position between 1/4 and 3/4 my temps keep raising to unsafe temps until I drop at or below 1/4 throttle or if I hold it at full throttle. When I go past 3/4 throttle I lose about 500 rpm but I'm pretty sure it's because it's too rich not to lean as my temps will drop and it sounds gurgley also the richer I go the worse it gets. I'm currently running a 110 polini jet with an A27 needle all the way up(clip on botton) and a 34 idle with the air screw just a hair past 2.5 turns out. It's a little rich but is close enough for now. I have the snorkel installed and I'm running premix with oil pump deleted. 1/4 to 3/4 throttle feels nice, but it's improved with every drop of the clip. Can someone tell if it sounds like I'm on the right track before I order a needle kit. I'll probably order it any but would still like to hear any feed back. TIA

[jackmisanthrope]

Also does anyone know if the Naraku needle set is any good?

[broyager]

I think you may have an air leak somewhere, 110 seems too high.

Zino posted this a while ago

70cc malossi dellorto 17.5 87-92 main yasuni r stock crank medium to hard clutch springs
70cc Athena Basic 19 mm 80-84 main yasuni r stock crank medium to hard clutch springs
70 cc Athena Basic 19 mm 80-84 main tecnigas slient pro stock crank medium clutch springs
70cc Athena Basic 17.5 mm 87-90 main yasuni r stock crank medium to hard clutch springs
70cc Athena Basic stock carb 84 main stock exhaust stock crank stock clutch springs

[aeroxbud]

I've used the Naraku needle jet kit. Was quite happy with it.

[Zino]

Your main jet sounds fat if your temps drop at 3/4 throttle .
Try this to see if you are fat on the main
with scooter warmed up
Go wide open for a 1/4 miles
Then back off throttle a 1/8 to 1/4 (this will momentarily make you richer )
3 things will happen
Rpms raise a few 100 rpms You are Lean on the main drop a jet
Rpms drop slowly This is close to dead on for wide open jetting
Rpms drop fast and it gets gurgly sluggish you are rich on the main go leaner on the jet

What temps are you seeing at part throttle and wide open ?

The A27 needle was perfect for me for dialing in mid throttle.

I run around a 90-95 main with the 17.5 dellorto with stock air box snorkel out

[jackmisanthrope]

That had crossed my mind but the only indicator of an air leak is my jetting being higher. I replaced the CVT side seal and it is good I checked it. The stator side seal looks good no oil seepage. I don't have any oil seeping any where I've blasted it with a whole can of starting fluid. It runs good it idles good I can pull the throttle wide open and cruise for a couple of miles without temps creeping too high it's only when trying to cruise for long period between 1/4 and 3/4 throttle. I will admit I haven't done a leak down test but I haven't seen anything that would make me think I need to but I guess at this point I probably should. Be way easier if it wasn't a flange mounted carb

[jackmisanthrope]

Try this to see if you are fat on the main
with scooter warmed up
Go wide open for a 1/4 miles
Then back off throttle a 1/8 to 1/4 (this will momentarily make you richer )
3 things will happen
Rpms raise a few 100 rpms You are Lean on the main drop a jet
Rpms drop slowly This is close to dead on for wide open jetting
Rpms drop fast and it gets gurgly sluggish you are rich on the main go leaner on the jet

I've tried this all the way up to a 118 main. The higher I go the worse the rpm drop. At 3/4 I'm cruising at about 10500 rpms and when I go to full throttle I drop to 9500-9800. It does the same if I go from full throttle and drop to 3/4, rpms increase 500 to 800 rpms

What temps are you seeing at part throttle and wide open ?
I can cruise around all day stop and go and it doesn't get higher than like 280.
I can go full throttle for a couple of miles and temps seem to be level off around 310.
If I rip for a like a mile anywhere between a little over 1/4 upto 3/4 throttle temps spike to 330 and then I have to back down to below half throttle to get temps to start dropping. If temps don't get above 310 to 320 I can go to full throttle and get the temps to drop back down and level back out around 310 to 315.



The A27 needle was perfect for me for dialing in mid throttle.

I run around a 90-95 main with the 17.5 dellorto with stock air box snorkel out

[jackmisanthrope]

Have the needle kit ordered and I'm going to do a pressure test while I wait for it to get here like I should have done to begin with. I'm gonna be real mad at my past self when an air leak is why I've been chasing my tail but at this point I'd take it. If I end up not needing the needle kit I'll have it anyway lol

[jackmisanthrope]

I was finally able to get back to this. Held pressure and vacuum for 10 minutes each. I did it twice so technically 20. No leaks. I'm going to swap in a fatter needle and see what that does.

[jackmisanthrope]

PHVA needle diagram









Im going to leave this here for future reference and anyone else who needs it

[jackmisanthrope]

I think I've got it pretty close to dialed in. I swapped the A27 needle for an A20 and raised it a notch to second from bottom. I changed the MJ to a 106 and the PJ to a 33 1.5 turns out. After getting the engine warm I held it WFO for almost 3 miles and temps topped off at 324. I turned it around and ran it at 3/4 throttle the way back and the temps crept just over 330. Throttle feels good all around. My tach showed me spinning at 11k, this seems high to me but it's consistent with this reading at WOT. I haven't GPSd it yet but the speedo looks like it would be right at 60mph if it went that high. I definitely need to get my taller gears installed if for no other reason than bringing down the rpms to preserve my crank. I'm thinking about trying out the A7 and A8 needles just to see what they do. 

[TheScooterJesus]

So excited you finally got it running right! I love my Roughhouse, and compared to 80's and 90's scooters theyre super easy to work on!
You could probably raise your weights a half gram and reduce from 11k to 10k and gain a bit of top end. I dont like to rev past 10k personally to lengthen the engines lifespan, but they can definitely handle it.

[jackmisanthrope]

Thank you, it needs a little more tuning to be perfect but it's close enough for now. I can ride the piss out of it without worry. My temps stay right at 260 when I'm eating stoplights around town and gets up between 290 and 300 when I'm cruising around 45mph for longer distances. I've put close to 200 miles on it over the past few days and it's a blast. I'm probably going to get the gears in before I mess with it anymore.


Also I don't think I mentioned it before but one of the contributing factors to seizing the polini kit was a faulty Runleader temp gauge. It was reading about 50 degrees off.

[bigmatthew86]

You could go a little leaner & pick up a little power. 300 degrees wide open is definitely on the rich side. I shoot for topping out at 350.