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 Car runs a bit uneven 
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Firing on two.

Joined: February 17th, 2009, 8:43 pm
Posts: 567
Location: NOrWAY
Post Car runs a bit uneven
Hi folks

I have this little issue with my 2CV, fitted with an engine, carburetor and gearbox of the last/newest models.

It actually runs and drives very well. Smooth tick-over, good throttle response and pulls smooth and even as long as the second stage opens in the carburetor.

The only minor problem, which I would like to do something with, if I can, is this little uneven run at certain rpm's in certain speeds, when under load.

It is worst going up hills in like 40 to 50km/h (25mph). The more rpm, the less noticeable. OR, at very low revs.
If I open the throttle so that the second stage opens, it pulls smoothly and powerful.
If I reduce the throttle, so that the car hardly accelerates, it runs smoothly also.

Would you say it's a worn carburetor or should I try different jets? What's the best jets for the best fuel-economy without the uneven run? Or is it something completely else?

Suggestions welcome :)

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Vennlig hilsen, Eirik
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Five 2CV's, DS 21 ieh Pallas -70, DS 23 h Pallas -75, CX 25 GTi automatic -89, XM 2,0i -90
And a Heinemann Z412 -80


June 18th, 2014, 9:21 pm
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Firing on two.
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Joined: October 5th, 2009, 8:22 pm
Posts: 1415
Location: Stone, Staffs
Post Re: Car runs a bit uneven
Sounds like mine used to be - King Ken suggests a larger primary jet than the original which should stop the lumpy running on light throttle

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1987 2CV Special
2014 Suzuki Swift Sport
2015 Lexus NX300h
1966 Ami Break


June 18th, 2014, 9:38 pm
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Firing on two.
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Joined: October 5th, 2009, 8:22 pm
Posts: 1415
Location: Stone, Staffs
Post Re: Car runs a bit uneven
Needs to be 107.5...

_________________
1987 2CV Special
2014 Suzuki Swift Sport
2015 Lexus NX300h
1966 Ami Break


June 18th, 2014, 9:40 pm
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