Big Bore - Best Carb?

[blubayou]

Hi Guys, about to go big bore, at the same time been having carb issues on my standard set up.

My question is, who is using what carb set up to good effect (or indeed bad set ups) on their 80cc (72cc) scoot?

Any info greatly appreciated.

BluBayou.

[BillyGreen1973]

I have the 80cc kit.

My carb settings are as follows.

Standard carb with
#90 main jet.
2 and a half turns out, for the mixture screw.
The clip is on the middle groove on the jet needle.
I am using a smallish free flow airfilter. (like this one on ebay, 8059758250)
The tick over is set to the standard 1900 rpm.

I get around 45mph on the flat, well over 50 downhill. (not sure how much, speedo stops at 50mph), acceleration is very good (5g rollers), there are no flat spots in power. The only thing I'm not 100% happy with is the full throttle position, it feels as if it's got more to offer but just won't.

Hope this helps

[blubayou]

Hi again,

Been in touch with Dellorto UK, they suggest a Dellorto PHBG, sized 18-20mm. That's it.

I get the impression they aren't that keen on selling carburettors.

When is someone going to wake up to the pent up demand for parts for these bikes?

Anyone else got any good setups?....

[chcknugget]

blubayou said:

Hi again,

Been in touch with Dellorto UK, they suggest a Dellorto PHBG, sized 18-20mm. That's it.

I get the impression they aren't that keen on selling carburettors.

When is someone going to wake up to the pent up demand for parts for these bikes?

Anyone else got any good setups?....

This is my basic setup:





I gained about 3 mph when I did the conversion. It flows better than stock, and you don't have to worry about the auto choke malfunctioning (though mine never did). It's a 19mm keihin carb found on Honda 70cc trail bikes...

[chcknugget]

[blubayou]

Hey Chcknugget,

that's sweet, thanks for the info & pictures. Have some Karma #thumbs_up#