Air screws do they have to be the same ?

[Jens]

the 2 air/fuel screws in the carb, do they have to stand the same way or ?

I mean front cyl. 2 1/3 out
the rear cyl. 4 1/5 out

good or bad for the engine ?

(And yes i know run it on a dyno, but no dyno arround me.)

Jens.

[sirch345]

No they don't necessarily need to be the same settings for each carb, but they're not usually that far apart. The rear one seems to be a long way out to me, how did you end up with it in that position

Chris.

[Jens]

i had alot of backfire from the exhausts, so read its normaly becouse they are to lean. so tryed to unscrew the rear a out. I have no backfire anymore at all :-) but wass woundering if i could damage the engine with it.


Jens

[Phil-VTwin]

The most common cause of backfire is a small leak in the exhaust joints so make sure they are fully sealed first, high temp silicon sealant is perfect for that job.

At 4 turns out on the rear you run the risk of the screw falling out due to not enough tension on the small spring.

[sirch345]

i had alot of backfire from the exhausts, so read its normaly becouse they are to lean. so tryed to unscrew the rear a out. I have no backfire anymore at all :-) but wass woundering if i could damage the engine with it.


Jens

As Phil said, more likely the exhaust system drawing in air at one of the joints making it pop and bang so worth checking that out. If the mixture is way off with the settings you now have, yes you could do damage to the engine.

Chris.