70cc kit

[Dam_buster]

right should i have gotten a bigger carburettor? or should i just leave it, with an up jetted standard carb?

just talkin 2 a mate and he said i should have gotten a bigger carb!

so naturally i started to worry!


Jim
____________________
Yamaha R6 5EB, BMW 328i Touring, BMW 328i Coupe

[Kickstart]

Hi

Depends what is on there already. Chances are that you would probably get a power gain from a larger carb as well (after all you have increased the engine capacity by 40%, so the chances are the stock carb will now be a touch restrictive).

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Dam_buster]

ah ok well ill see if i can get one from a brokers yard... IE EBAY lol
____________________
Yamaha R6 5EB, BMW 328i Touring, BMW 328i Coupe

[divuk83]

A 19mm carb is fine for an MHR rep kit.

Dave

[Kye]

You don't NEED a bigger carb, just it will give you more power, anything around / above 17.5mm works well on a 70cc kit, considering the full race ones only use a 19mm normally.

[DM]

A 17.5 mm would be horrible with a 70cc kit. That's a Gilera Runner 50's stock carb size and definitely too small for a kit. I'd go for at least a 19mm, preferably a 21mm. Heck, my friend's brother has a 28mm with his 70cc kit on a Motorhispania RX-50, recommended by the manufacturer (though I admit that's gotta be a special case).

[binge]

[ts50x0]

considering the whole idea of more cc's is to burn more fuel/air then it will make a hell of a difference.

[Dam_buster]

off to shops with cash...

"hello id like to buy a 19mm carburettor please.....
____________________
Yamaha R6 5EB, BMW 328i Touring, BMW 328i Coupe

[divuk83]

You already have one don't you?

Dave

[Dam_buster]

how do u mean ,,,, i have an upjetted carburettor, which the garage did




JIM
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Yamaha R6 5EB, BMW 328i Touring, BMW 328i Coupe

[Dom_]

Personally i would get a 21mm carb, that's what most people with big-bore kits seem to go for.

[divuk83]

Dam_buster: Your profile says you have a 19mm carb.

Dave

[binge]

Hahaaaa! BUSTED!

Lying about your set up Jim?

<|Binge|>

(Yeh, my speedfight has a Nexus 500cc V-twin Lump in it )

[K!K @]

What tends to happen if you dont have the right size carb it the power dilivery isnt there as quick as it should be.
So you dont need 1 but its better if you do.

Good Luck with it
____________________
Suzuki AY50 Katana
~Elite~Knights~

[graeme]

i have got a malossi 70cc big bore kit on my speedfight an it is alot better if you get a bigger carb, i am running a malossi carb, 21mm i think