Print Page - 420, 495 jetting

Title: 420, 495 jetting
Post by: tlanders on August 17, 2004, 06:14:02 PM

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

Teddy

Title: 420, 495 jetting
Post by: ktm96duke on August 17, 2004, 10:29:28 PM

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

Title: 420, 495 jetting
Post by: tlanders on August 18, 2004, 11:30:57 AM

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

Title: 420, 495 jetting
Post by: tofriedel on August 19, 2004, 09:29:23 AM

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

Title: 420, 495 jetting
Post by: tofriedel on August 19, 2004, 09:33:15 AM

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

Title: 420, 495 jetting
Post by: tlanders on August 19, 2004, 04:51:32 PM

Tony,

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

Teddy

Penton Owners Group

General Discussion => Penton Talk => Topic started by: tlanders on August 17, 2004, 06:14:02 PM