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Fine tuning an 850, part 2

  • Thread starter Thread starter Guest
  • Start date Start date
koolaid_kid said:
If you have to go more than 3 turns out on the pilot screws I suggest you go up one size on the pilot jets themselves.
Click to expand...

Pilot jets are EU spec so that's already a size up from the USA spec. Not sure if this is good or bad for when tuning with the dynajet kit :o - they don't mention the pilot jets at all in their instructions :-s .
 
Psy I would try turning the mixture screws out by 1/2 a turn and see if that lessens the popping and if not happy try another 1/2 turn out (1 turn total). Hopefully this will lessen the popping and still retain the smooth transition to the needle circuit. Worth a try before pulling main jets and moving needles around again.

Good luck with it.
 
hi!

i'm also in the process of finetuning my carbs after installing k&n's but i can't seem to find a website that sells larger pilotjets for my 1979 GS850, the main jets i have.

any help? thx!
 
Psy....... fit some new plugs. After setting your mixtures using the highest idle method, do some slow speed work ( in the 1/8 throttle position) and then do a plug chop. This will tell you whether the idle circuit is too lean or not. The needle will have little influence at this throttle position. Once you've established what's happening in the pilot circuit, you will be in a better position to decide whether to increase the pilot jet size or not, and then start sorting the needle position.

Popping on decel is caused by unburnt gases igniting in the exhaust. It can be an over rich indicator or the result of air leaks at the header flanges. It's more common when using certain 4-1 exhausts as the scavenging at overlap is increased along with the tendency for back flow in the intake tracts at lower rpms.

You haven't got the stock velocity stacks still fitted inside your K&N's, have you? The pods wont like that combo, as others have discovered on site.
 
Last edited:
Nightmare.

I lowered the needle (back) to third notch from bottom and adjusted the mixture screws to 3 turns out (this is approx 1 more turn out from the setting got by the highest rpm method).
Starts, idles and takes off beautifully to approx half trottle. Smooth like a baby's bum.
At 3/4 throttle or WOT - it rans like CRAP! It just doesn't pull...

Main jet is DJ165 - the largest of the three supplied in the DJ kit.

Do you think this indicates lean or rich condition at WOT? :-k


Plug chops give inconclusive results, not dramatically lean or rich (or I don't know how to read them... :o ). I haven't done the chop at WOT however.


Any thoughts? :pray:


I'm thinking I'll get some size 40 pilots (in place of 42.5) and lift the needle again and see what that does. I know from previous setting that just lifting the needle causes stumbles at up to 1/4 throttle, but it runs like a champ after that.
 
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