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4-4 MACHINE TUNING
NEEDLE CLIP POSITION
The jet needle is linked to the throttle valve by
means of the needle clip. Its lower part is tapered
and it has five grooves cut in the upper part where
the needle clip fits.
To adjust the air/fuel mixture with the jet needle,
change position of the needle clip which is set in the
3rd groove. The lower groove the clip is moved to,
the higher the jet needle rises and the larger the
clearance with the needle jet becomes, resulting in
a richer air/fuel mixture ratio.
The needle clip position can be changed by half to
fine-tune the setting. To change the needle clip
position by half, change jet needle from 24NAAH
type to 24NCDH type. This change will move the
needle position by half to the leaner side.
JET NEEDLE
NEEDLE NUMBER
Changing the needle itself controls air/fuel mixture
ratio particulary on lower mid-throttle opening. The
smaller the O.D., the richer the air/fuel mixture
becomes.
MAIN JET
The main jet, like the pilot jet, meters fuel flow.
Air/fuel mixture
Needle type and clip position
Lean
24NCDH-1st
24NAAH-1st
24NCDH-2nd
24NAAH-2nd
24NCDH-3rd
24NAAH-3rd
24NCDH-4th
24NAAH-4th
24NCDH-5th
Rich
24NAAH-5th
Lean
Rich
Needle
clip
1
2
3
4
5
Air/fuel
mixture
Needle Number
O.D.
Lean
24NAAK/24NCDK
2.415 mm
24NAAJ/24NCDJ
2.405 mm
24NAAH/24NCDH
2.395 mm
24NAAG/24NCDG
2.385 mm
Rich
24NAAF/24NCDF
2.375 mm
O.D. of Needle
Clip
24NAAH
O.D.
128
Summary of Contents for RM85
Page 1: ...Part No 99011 02B82 01A April 2006 EN TK RM85 L OWNER S SERVICE MANUAL ...
Page 10: ... MEMO ...
Page 42: ...3 TROUBLESHOOTING 3 1 CONTENTS TROUBLESHOOTING TROUBLESHOOTING 3 2 ENGINE 3 2 CHASSIS 3 5 ...
Page 47: ... MEMO ...
Page 85: ...7 2 CLUTCH CONSTRUCTION CLUTCH 70 N m 7 0 kgf m 50 5 lb ft ...
Page 93: ...8 2 KICK STARTER CONSTRUCTION KICK STARTER ...
Page 97: ... MEMO ...
Page 115: ... MEMO ...
Page 117: ...11 2 FUEL SYSTEM CONSTRUCTION FUEL SYSTEM ...
Page 121: ...11 6 FUEL SYSTEM REASSEMBLY Reverse the sequence of removal ...
Page 141: ... MEMO ...
Page 200: ...SERVICING INFORMATION 18 15 Radiator hose Throttle cable Clamp Clutch cable ...
Page 205: ... MEMO ...