420, 495 jetting

[tlanders]

Anybody know the stock Bing carb jetting for the non reed valve 420 and 495 engines?

Teddy

[ktm96duke]

are you jetting a normal bing for the 420,and a power jet bing for the 495? they are both 40mm bings but radically different jetting due to the power jet for the 495.

1981
495
390
250
125
1980
420
125

[tlanders]

I am working on both the 420 with the regular Bing and the 495 with the power jet Bing. Do you know what works? Teddy

[tofriedel]

Teddy,

Listed below are the factory carb specs for the 1981 models as delivered -

                 420      495
Carb Type        54/40/102       54/40/107
Main Jet           195(200)        145
Power Jet            -             140
Needle Jet         282(284)        286
Jet Needle          6L2            6L2
Idling Jet          45(55)          50
Needle Position      2               2
Mixture Adjusting   MC 1 Turn       1.5 Turns
Screw Open
Throttle Valve      220             220

This information is available at http://www.ktm495.mxbikes.com/.  Go to the Parts manuals section & select Owners Repair Manual 1981 and then select Page 15 for the carb info.

Manuals for other model years are also available on this site.

Tony

[tofriedel]

Teddy,

The previous information did not show up as I had formated the info.

The number values on the the left side are for the 420 and the right side for the 495.  Sorry for the confusion.

Tony

[tlanders]

Tony,

Thank you very much for your help. Thanks also for the references. I knew the POG site would have the info!!!!

Teddy