640 worn needle jet

Island Hopper

Island Hopper

New member
I ordered a new needle jet and jet needle for my carb as I suspect that the old one is worn. Lately my Adventures fuel consumption has gone up slightly and I notice a little less power than normal. One well known KTM shop recomends replacement every 10,000 miles, I'm up to 22,000 km so I guess I'm overdue. Has any one else had issues with wear on these items?
 
Island Hopper

Island Hopper

New member
imported post

imported post

One drawback with uncorking is loss of fuel range, I do okay with the stock setup, a little lean at sea level means she wont be overly rich in the hills. Also opening up the airbox isn't such a good idea to me because I do quite a bit of riding in the wet stuff and the stock box is pretty watertight. When the time comes where I'm craving more power a 950 or 990 may be the ticket.
 
Hooligan

Hooligan

Member
imported post

imported post

Ohhhh, but the power....:dr:

....I do 550km on a tank, then I smell fumes....

:hb:
 
Island Hopper

Island Hopper

New member
imported post

imported post

550 KM isnt too bad, I doubt if I'm getting that anymore, I'll see if I get my 600 km back when I refresh the carb.
 
Island Hopper

Island Hopper

New member
imported post

imported post

Fuel light just came on at 391KM, a new all time low, I used to think 450 was low. Hope those carb parts arrive soon so I can get this fixed, she's burning about 15% more fuel than before.
 
Island Hopper

Island Hopper

New member
imported post

imported post

Not a stupid question, I looked into that a week ago and swapped a clean filter for a clean filter just to be sure. Still using the same filter oil as before so that hasn't changed either. As soon as the parts come in I'll give her a full service, valves, oil, new spark plug+ give the carb a good cleanout+ check float height. Everything on the bike remains the same as before other than the pulling off the charcoal can to eliminate that as a suspect.
 
Island Hopper

Island Hopper

New member
imported post

imported post

Did the full service this am, ripped the carb apart and did a full cleaning, looking at the jet and the needle they looked pretty good not much sign of visible wear. I then compared the old to the new and found the new needle didn't have as much slop fitting in the jet. I put her back together with the new parts and took her for a ride, what a difference, I now have my mid range power back. Not much time for testing as I had to take the Mrs. out for moms day dinner, but tomorrow I'll take her for a 500km test ride and see if it's as thrifty on fuel as it used to be.
 
You must log in or register to reply here.
Top