Air Screw placement

GoldenMotor.com
N

Novice

New Member
Aug 5, 2010
4
0
0
Norway
Hello.
I have recently put a Chinese engine on my bike.
It has been a great experience and I have had lots of problems owing to my own ignorance.

Now everything works well except my spark plug being black and wet giving not enough power to the engine. I was hoping someone could tell me where the Air Screw is placed, as I have been told that this should be adjusted so that the engine will be more lean.
Any ideas?
Thanks.
 
BarelyAWake

BarelyAWake

New Member
Jul 21, 2009
7,194
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Maine
Odds are you've the older style carburetor, in which case you haven't got an air/fuel set screw to adjust - if there's only one small, brass set screw on the side then it's indeed the far more common carb & that's just the idle set screw.

Never fear, you can still adjust your fuel/air mix - ya just need to take the top of the carby off and change the needle clip placement to a different slot, up for leaner (what ya want as yer runnin' rich) & down for richer. Yer after a nice coffee/tan plug color - white is too lean and can result in damage.

Here's a few pics;


Just be careful when reassembling as there's a tiny pin that needs to align with the cable slot in the slide, it's quite easy to sheer it off if you're not aware of it;

 
N

Novice

New Member
Aug 5, 2010
4
0
0
Norway
Thanks BarelyAWake, I did what you said and felt I have got a new bike today.
The needle clip was in the middle of 5 tracks and I placed it one up.
My engine with 80cc and 56 teeth sprocket is best tested going up hill and what a difference.

Since I got such a good response I wonder if someone would recommend a good spark plug. The one I have is probably good enough for some time but it would be nice to know which spark plug to replace it with.
Again, thanks a lot.
 
Last edited:
2door

2door

Moderator
Staff member
Sep 15, 2008
16,302
175
63
Littleton, Colorado
Most builders rely on the NGK plug, number B6HS. I use them but I've had very good luck with the Champion 811/ L82C plug. I don't know about the availability of either of these plugs in Norway but they can be ordered from the U.S, I'm sure. Check with the sponsors found on this forum.
Tom
 
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