82cc Big Bore Tuning Difficulties

[Mystic]

IDK I would imagine they will make both, more money

[Trafficjamz]

From what I understand that carb is massively oversized. Whether that actually hurts performance, I don't know.

The 82cc will run just fine on a 28mm oko carb

[Trafficjamz]

does your 28mm OKO have the power jet hose blocked off?

Did OKO made a 28mm carb with the power jet?

Yes they do.

[CAPT]

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[Bear45-70]

From what I understand that carb is massively oversized. Whether that actually hurts performance, I don't know.

The 82cc will run just fine on a 28mm oko carb

I'm with Pimpspree, even with the porting comparable to the CR80 the 28 is too big, a 26 is normal for a CR80 and it has a better trans than a scooter does.

[hirschdogginc]

my first post on this forum. ive been working on my sa50's for over 12 years with so many differant variables. i run a oko 24mm jetted a little rich. a "little" rich. metrakit expansion chamber, ct manifold, carbon reeds, polini 72. im not sure my gear ratio but i know i bought the tallest gears i could for longer rides. i agree with the trans tuning. i bought pretty much every part for every combination you can buy and tried it all. trans tuning and jetting is your problem, it could take you a while to get it all figured out. ive been drag racing both motors and havent lost yet. i did do alot of port matching and im sure that helps. i did try one time witha case i didnt port match and had a huge lag at takeoff. trophies are nice. i ride this to the strip 10 miles at almost wot and no problem. then race.

[Trafficjamz]

From what I understand that carb is massively oversized. Whether that actually hurts performance, I don't know.

The 82cc will run just fine on a 28mm oko carb

I'm with Pimpspree, even with the porting comparable to the CR80 the 28 is too big, a 26 is normal for a CR80 and it has a better trans than a scooter does.

I am not trying to say a 28mm carb is ideal for 82cc, I am just stating that it will work.

Throttle-Jockey said he was having acceleration and top speed issues.

He stated what his setup was and asked for help, not everyone's opinion on what carb size is best for a 82cc bore.

He has a 28mm let's help him with that. We all know it can work.

Just saying "The carb is too big" is not helpful at all.
Might as well say "The tires are too small" or "The bore is not big enough"

[Bear45-70]

The 82cc will run just fine on a 28mm oko carb

I'm with Pimpspree, even with the porting comparable to the CR80 the 28 is too big, a 26 is normal for a CR80 and it has a better trans than a scooter does.

I am not trying to say a 28mm carb is ideal for 82cc, I am just stating that it will work.

Throttle-Jockey said he was having acceleration and top speed issues.

He stated what his setup was and asked for help, not everyone's opinion on what carb size is best for a 82cc bore.

He has a 28mm let's help him with that. We all know it can work.

Just saying "The carb is too big" is not helpful at all.
Might as well say "The tires are too small" or "The bore is not big enough"

Too much carb creates these tuning issues. The "too big a carb" is a trend on this forum (and others) and big carbs are for racers. The most that the average guy gets with his big carb is an ego boost and bragging rights, not the best all around performance, which is what a street scooterist should be striving for. Also the street guys should be using CVK carbs and NOT flat slide carbs. Now that is good advise. Remember that the guy selling you these big carbs cares about profit and not what is best for you and your scooter.

[kingkamehameha]

Bear you don't even have a bike ttthatt would need a 24mm carb cause yours are stock and haven't. even seen 60 plus

[Bear45-70]

Bear you don't even have a bike ttthatt would need a 24mm carb cause yours are stock and haven't. even seen 60 plus

Oh, so my 3 Aero 80 scooters, that's 79.7 cc's, don't need bigger carbs? Or my 5 Aero 125 scooters, that's 124.5 cc's, don't need bigger carbs? What planet have you been living on? The 80's come with a 16 mm carb, only 2 mm bigger than the Spree has, but with a 66.6% increase in cc's. The 125's come with an 18 mm carb for and engine 2.5 times bigger than a Spree. Of course they need more carb, too small a carb is how Honda limits the top speed on these scooters.

[kingkamehameha]

What planet are you living on. 125ccs all for nothing cause your aero is still slowwwww.

[Bear45-70]

What planet are you living on. 125ccs all for nothing cause your aero is still slowwwww.

What are you now maddog's little brother?

[Wheelman-111]

Greetings:

Carburetion need is determined by displacement x RPM.

A LOW-REVVING bigger bore might need the same-sized carb as a small-bore screamer.

In my case, I could never get the 30mm to run right in the midrange on the 90cc, Once clear of the messy transition to top speed, however, it topped 70
24mm ran sweet on the 72cc Corsa, but topped out at 65 and change.
The 26 was a little trickier to get clean midrange, but gained nearly 4 MPH on top. Eventually I sorted out the midrange tuning.
HP = TORQUE x RPM.