tuning carbs after jetting

Gisser · July 05, 2007, 06:45:01 PM

Quote from: TANNER on July 02, 2007, 05:37:28 AM
The K&N is a drop in filter pod, NOT the lunch box. Will the lunchbox make a big difference over the drop in filter? The remaining jets,Yeah i still have them, Yeah we can work out a deal once i get this damn thing running right, Just wanna make sure i wont need them to get running.

Thanks

Clay Tanner

Hang onto those DJ122 jets. You need them. Because the problem is that the carbs are jetted for Stage-3 while the K&N drop-in filter is strictly Stage-1. If problems persist with the DJ122's consider that there may be additional Stage-3 work needing to be reversed.

Doesn't anyone read instructions anymore?

TANNER · July 08, 2007, 08:32:38 PM

the only thing that i see different in the directions is the use of the LUNCHBOX filter, k&n RU-2970 would this make that much difference?

Gisser · July 08, 2007, 11:49:24 PM

Re: Lunchbox

Big difference in jetting; small difference in HP.

TANNER · July 10, 2007, 06:23:30 PM

Bingo! Jets were too big, took care of my 5-7k bog THANKS!!!!

TANNER · July 10, 2007, 06:33:03 PM

Now then here are a few more questions. Besides the fact of the stage 3 reversal, I have the throttle hanging at a high rpm(3500-4K) after acceleration. I read before that this could be a lean problem solved with the idle mixture screws, it smells kind of gassy when idling.. but im not for sure. Another thing it cackles and pops like an old straight pipe pickup when i let off it at high rpm 5K and up. Another thing how

HOT

should these things run, mine gets to the point where it tough to hold your hand on the case for any length of time after a quick 8-10 min ride through town

i dont think this should be the case. All the help has been awsome! i thank you guys a lot!

genEricStL · July 10, 2007, 06:42:16 PM

8-10 minutes of riding for me heats my engine up enough that it burns the back of my hand when adjust the idle screw ( i should'nt have messed with it at all lol ... it just ended up getting set back to where it started)

TANNER · July 10, 2007, 07:18:51 PM

OK> went for a little test ride, and it seems to stay pretty cool out on the highway 55 mph, prolly just me beating on it in town making it hot, eh? as for the idle problem it got a lot worse as it warmed up all the way.. .................................

idle 1300, hit the throttle a little and it jumps to 3500 rpm and stays there. slip the clutch a little with hand on brake and it pulls it back down to idle.. hmmmm. ?

It even jumps when shifting, pull clutch to shift and hit 3500....

Gisser · July 10, 2007, 08:36:18 PM

If your mechanic had done a good job with the jet kit installation he would have uncovered the mixture screws. These lie at the bottom front of each carb and are factory preset on the lean side for emission requirements. They need to be turned clockwise until they lightly seat then turned out 2-1/2 to 3 full rotations to steady the idle and quiet the pipe to the extent that it can be quieted. If you do not have access to the mixture screws ask the mechanic why not? Because the carbs will have to be pulled to perform the procedure.

TANNER · July 11, 2007, 04:35:50 AM

I can see the mixture screws (with a mirror) and i will try resetting them, just wanted to make sure that was where my problem was. Now i just need to find a really really ... really short straight screw driver..

bosozoku · July 11, 2007, 05:16:39 AM

Quote from: TANNER on July 11, 2007, 04:35:50 AM
I can see the mixture screws (with a mirror) and i will try resetting them, just wanted to make sure that was where my problem was. Now i just need to find a really really ... really short straight screw driver..

Just use the bit from an electric screwdriver. The mixture screws are quite easy to turn, so you don't need a big handle. Also, put two marks of different colors on the body of the bit (use nail polish or something), so you can easily see how far you're turning the screw.

-b.

coll0412 · July 11, 2007, 09:30:10 AM

Ahh dude, I totally missed the fact that you have stage 3 kit in there :doh:

What size jet did you end up using, the DJ122 or the DJ118

TANNER · July 11, 2007, 10:23:47 AM

n/p.. i used the 122

coll0412 · July 11, 2007, 03:37:52 PM

Do you still have your stock needles? I don't think I am going to find anyone with extra DJ jets anymore so I might have to run stock Miki jets

bosozoku · July 11, 2007, 03:49:37 PM

Quote from: coll0412 on July 11, 2007, 03:37:52 PM
Do you still have your stock needles? I don't think I am going to find anyone with extra DJ jets anymore so I might have to run stock Miki jets

Not a tragedy -- I've heard that the stock jets are actually more precisely machined than the Dynojet parts. You'll just need to open up the slide orifices if you have the Dynojet restrictors installed.

-b.

TANNER · July 11, 2007, 04:25:27 PM

I will look what parts they threw in the box.. Ok.. another question. Is there a possibility my high idle is being caused by fuel getting past the main jet needle? I cant get rid of this 3500 fast idle problem?

bosozoku · July 11, 2007, 04:29:59 PM

Quote from: TANNER on July 11, 2007, 04:25:27 PM
I will look what parts they threw in the box.. Ok.. another question. Is there a possibility my high idle is being caused by fuel getting past the main jet needle? I cant get rid of this 3500 fast idle problem?

Stupid question -- is your throttle cable (NOT the idle screw) adjusted correctly? With the throttle released, you should have a bit of slack at the carb. Not a lot, but enough to feel it. Also, are your carbs synched?

-b.

TANNER · July 11, 2007, 04:35:46 PM

yeah the carbs are synched, used the fishtank sync setup i founf here. worked really well once i got all the leaks out of those cheap connections. I did ajust the throttle cable to where i thought was adequate before i put the tank on and havent checked since to see if i jarred anything

, i will give it another check. Can you use the stock needles with the dynojet jets? Thank you for all the help, any advice is a great help.. getting close to back on the road.

bosozoku · July 11, 2007, 04:41:45 PM

Quote from: TANNER on July 11, 2007, 04:35:46 PM
Can you use the stock needles with the dynojet jets?

Probably, but you'd have to play with jet size, since Dynojet numbers aren't the same as Mikuni jet numbers. Why bother, though -- Mikuni jets are stupidly cheap even at dealers.

-b.

TANNER · July 11, 2007, 05:45:55 PM

plenty-o-slack in the throttle cable going to look for a possible vacume leak.?.

TANNER · July 11, 2007, 06:14:52 PM

Would it be possible that the needle is set a little to high and letting fuel slip by that jet? sprayed some carb cleaner around the carbs while running and didnt get the idle to jump at all.. going to do a bit more searching for vacume leak.. so far im empty handed

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tuning carbs after jetting