05 Zuma

[bigmatthew86]

Got the carb installed today. Currently running 95 main, stock pilot, needle middle slot, 2 turns air screw. Still getting too hot. Started with 88, then 92, 95 now. It’s getting better but I can only hold it wide open for around .25 mile & it’ll hit 350. It drops pretty fast when I let off. Should I just keep going bigger or does it say something else is going on? I think I could have had a slight leak around the elbow that goes into the air box so I siliconed it up but won’t know until tomorrow if it doesn’t rain. It does seem a little more responsive & like it might pull a little harder.

[Zino]

That doesnt sound healthy with that big of jet

Check for Air Leaks
With the scooter running I like to run a unlit propane torch along the seams of the carb and intakes and listen for rpm speed changes .
Others like to use starter fluid /carb cleaner instead of a unlit torch

[Zino]

Exhaust leaks is the second check
Check for exhaust leaks by taking a wet rag with a gloved hand with the scooter running .
If the scooter kills quick you are good if it keeps running then your exhaust gasket or your silencer has a leak .

The exhaust gasket is a problem the silencer is not .
Just like checking a leaky bike tire use soapy water in a spray bottle and spray the seams around silencer and atand see if you have a leak

[nikola11]

How large is the opening on your airbox?
When running a 17.5mm carb it would be best if the opening was 18-19mm. You can use a 90 degree pvc elbow or something similar that is the required diameter.
With that setup I believe you should not need to use a jet larger than 88.

[bigmatthew86]

It’s just the stock box with the snorkel removed. I’ll do the propane test & look for an air leak.

[bigmatthew86]

No luck on finding a leak. I’ve tried the torch all over with no change.

[bigmatthew86]

Well I found my issue. I have a stage 6 jet kit. Their #’s are like mikuni not dellorto. So the 95 I was running was more like an 83. I put in the 100 & it’s way better. That is roughly an 86.5 dell. Wide open for long periods of time it would slowly creep up towards 350 & I managed to hit 355 going up a big hill. I have a 102 which is an 88 so that should put me just about right.

[captincvmn]

Do the numbers have any value outside of an arbitrary numbering system? .080 inch, mm, hairs?

[bigmatthew86]

To my knowledge dell’s do. Mikuni does not I don’t think.

[bigmatthew86]

What do I need to do to swap in 08+ secondary gears. I’d like to get a little closer to the magic 11:1 without going to straight cuts due to noise.

[Zino]

Just buy the 2008 from your local dealer or from partzilla or bike bandit.
They are on Backorder

12 to 1 all the way down to 10 to 1 with the higher power set ups .
I would not expect a big Increase going from 12 to 1 11 to 1 . Maybe 2 miles more up top
Aeroxes stock run 12 to 1 with 50 cc and hit 50 mph

Straight cut gears sound kinda like a turbo until they wear in I dont really notice them anymore after a 1000 miles .
You could upgrade your variator for better shifting and higher gear ratio.

[nikola11]

A different vario (top performance or polini hi speed) would give him a max of 8km/h (4,9mph) more top speed.
Straight cut gears are not that bad at all if you put in a thick gear oil. I have tested out various oils to try and keep the noise down and have found gear oil for tractor gear transmissions works the best. I believe it is sae 140 oil. With that oil the gearbox is no louder than stock.

[bigmatthew86]

Do you only get those gains going over range? Do you gain anything worthwhile just replacing the variator? I figured the secondaries were probably worth 2mph.

[Zino]

We are talking about Non Overrange variators .
The Stock Variators are 93 mm and the Sport are 95-97 mm The Overarrange are over 99 mm .

Like I tell my wife its not all about the size to make the magic happen .

The variator upgrades also have better ramp angles to give better shifting and acceleration

I have used both polini and malossi variators They both added similar top speed when dialed in.

[bigmatthew86]

Sweet I’ll put it on my list.