best carb for 90cc aprilia rs50 2004?

[sploosher01]

quick question:, I have now fitted my 90cc engine on my Aprilia Rs 50 2004 and it does run, but I would like to fully spec out my bike and the current carb is quite cheap. so I am asking which carb would you guys recommend for my bike(I would like it to go as fast as possible but also be reliable, also it has to be 21mm)(and moneys not an issue). thanks
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Regards, nico

[RhynoCZ]

I'd stick with the original carburetor and pay someone to tune it up, if you can't do it yourself.

Going as fast as possible but also being reliable, I'm gonna either recommend you to get the 125ccm version or whatever 250ccm+ 4 stroke.

Highly tuned engines never last, especially two strokes.

EDIT: IF you're too young to ride bigger machines, wait.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[sploosher01]

I think I will get a new one but get someone else to tune it but for a budget of £60, which one would anyone reccomend? thanks
____________________
Regards, nico

[Nobby the Bastard]

[RhynoCZ]

[Feathers McGraw]

Polini CP 21mm, 23mm, 24mm.

Very easy to setup, compared to Dellortos.

https://www.polini.com/en/technical-area/polini-cp-carburetors/features/

https://www.polini.com/en/technical-area/polini-cp-carburetors/instructions/

Use a cold plug (NGK B10ES) or it'll detonate a hole in the piston.

[stevo as b4]

What make is the conversion and is this a stroker crank engine? And if so are you using std cases, and did they have to be trenched?

I ask as I thought the biggest bore AM6 conversions were around 75-76cc and for the 80-95cc conversions you had to stroke them as well?

A 90cc motor won't be cheap, so don't skimp on parts, and you won't understand this but don't run it as a daily driver, it probably being a highly strung single ring motor, just won't last or be reliable enough for depending on as transport at all.

I've seen a few AM6's with the TPR86 conversion and they make over 20bhp but just don't last more than a few hundred km. Not much good for a road bike even for an emotional/hot headed/immature 16yr old who can't be told, and thinks its the coolest thing to do to their daily ride.

I don't want to sound all Teflon Mike with an Autists yard full of scrap, but I've got 3 KMX engines and a few old top ends and spares, because I like messing with my bike. But If I was going to ride to work on one, I'd be using a totally std engine and looking after it, without scrimping on parts, oil quality or maintenance.