What will I need to undo a dynojet stage one?

rdragoo · Post by **rdragoo** » Fri Dec 14, 2007 4:49 pm

Previous owner had Tims overhall the carbs on my 79, and install a dynojet stage one kit. Everything I read tells me this is too rich. This is probably compounded by the fact that I live about 4000 feet above sea level. Besides the stock needles and jets, what will I have to find in order to return these carbs to the stock jetting? I'm not sure exactly how the stock needles were assembled and the micro fiche is just too blury.
thanks,
Randy

415ZR1 · Post by **415ZR1** » Fri Dec 14, 2007 5:57 pm

rdragoo · Post by **rdragoo** » Fri Dec 14, 2007 6:37 pm

I have a K&N filter and stock airbox with a supertrap 6 into 2 exhaust. I do not have the OEM needles. Not much sustained high speed riding either. What bothers me about the dynajet is thier non standard main jet sizing. At least with the keihin, you know what you have. The bike just smells rich to me and seems flat on top and slow to get to redline if you nail it. I really believe it's jetted too rich, at least on top when it's on the main jets. I may have to live with the dyno needles and chase down the factory jets.

415ZR1 · Post by **415ZR1** » Fri Dec 14, 2007 9:45 pm

Going back to Keihin (first choice) or EBC RD Precision jets is probably a good idea. I've never liked DJ non-standard jet numbering either. Have also wondered about DJ jet sizing. Supposedly DJ jets are based on drill sizes/hole dia where as Keihin and EBC jets are flow rated.

There are tried and proven jetting combinations floating around. Do a search plus I'll have a look in my ref materials. I'd probably start with a proven combo rather than going back to showroom jetting numbers, which was somewhat on the lean side.

If the jet kit was installed correctly, your mains are probably in the ball park. Most riders don't get into the mains that often anyways. For the interim, you might want to try lowering the DJ needles a notch or two. May fix your problem for the short term and confirm that your jetting is on the rich side.

Also a very obvious possibility...is the K&N serviced correctly? Not too much oil? Just trying to rule out the "doh" possibilities. If even a suspect, try riding with a stock paper filter or the K&N cleaned but with no oil. Don't run the K&N w/o oil for very long or in dusty conditions.

cbxtacy · Post by **cbxtacy** » Fri Dec 14, 2007 10:16 pm

and the lean condition of stock could be good at 4000 feet.

rdragoo · Post by **rdragoo** » Sat Dec 15, 2007 4:26 pm

That's a good idea to check the K&N filter. I haven't cleaned and re oiled since I bought the bike 4 months ago. I'm sure the DJ needles can be dialed in, but I agree about switching to a standard Keihin or EBC jet. That's going to be my plan. I'm thinking very close to stock would be good for my 4000 ft altititude.