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Message started by whizzer on 08/04/20 at 07:41:49

Title: Carb headache
Post by whizzer on 08/04/20 at 07:41:49

Trying to sort out a preowned '06 and found it had a needle with 3 grooves. Which position would be the same as shaving 1/2 the white spacer using the stock needle or can the 3 groove needle even be used? I think the previous owner tried using the dynojet kit and I wound up with a bag of mismatched parts. He changed the air screw mixture screw also and I can't get much response when trying to adjust so may have to change it back to stock. I have a 52.5 pilot jet, 152.5 main jet running a short ryca header pipe with a stock dyna muffler and cone filter. Bike runs ok, but backfires (pop pop pop) on decel, surges a little at low speeds, and takes choking when cold (75 degrees).

Title: Re: Carb headache
Post by verslagen1 on 08/04/20 at 08:02:39

797863257B766372170 wrote:

Bike runs ok, but backfires on decel, surges a little at low speeds, and takes choking when cold (75 degrees).

What kind of backfires are we talking about? pop pop pop or KERPOW!

grumble pops are pretty normal, KERPOWs usually mean an air leak (if you carb is set right) at the header or muffler connection.

Title: Re: Carb headache
Post by whizzer on 08/04/20 at 08:25:22

Just the usual poping

Title: Re: Carb headache
Post by whizzer on 08/04/20 at 08:28:22

Previous owner is not available, so I don't really know what all he did to the bike and carb before I got it. I think the only thing he did was fool with the carb and didn't know much mechanical.

Title: Re: Carb headache
Post by verslagen1 on 08/04/20 at 08:35:30

there are at least 2 styles of idle mixture screws and it's not obvious which one goes where.

so if you have one that 'looks original' I'd go with that unless it's a dead ringer for the new one.

then if you can screw it all the way in and it does nothing, the pilot jet is too big.

Title: Re: Carb headache
Post by whizzer on 08/04/20 at 08:42:26

The reason I think the mixture screw has been changed is that the head of the screw sticks out past the carb casting. There is more material past the threads of the screw than I think the original had.

Title: Re: Carb headache
Post by verslagen1 on 08/04/20 at 10:15:43

I'd only be concerned with the tip, not the head.

Title: Re: Carb headache
Post by whizzer on 08/04/20 at 10:23:27

I don't have another screw to compare it to is the problem. I may be better off just getting a new screw and that way will be confident I have the correct part.

Title: Re: Carb headache
Post by whizzer on 08/04/20 at 10:28:30

I just found a small bag of misc. carb parts that the previous owner had left in a tool bag. Looks like pilot, main jets, original needle and 2 needle jets that are marked X7. Some parts don't even look like they came from a Mikuni carb.

Title: Re: Carb headache
Post by whizzer on 08/04/20 at 15:17:05

I think I have figured it out, maybe someone will chime in. The needle jet was changed out to make the new 3 position needle work. There was no washer or spacer used, so all I need to know is: which slot to use on the needle and if I need the spacer or washer. The mixture screw issue will be resolved when I put the new screw in.

Title: Re: Carb headache
Post by LANCER on 08/04/20 at 16:55:35

Suzuki’s needle jets and jet needles for this carb are:
NJ: X-6 & X-7
JN: 5C17 & 5C39

5C39 has only 1 groove for the clip.

Title: Re: Carb headache
Post by whizzer on 08/05/20 at 05:09:03

OK, I found two jets (both x-7) and one needle (39) in the bag. Now I guess I'll take the carb apart again and try to see what is in there. Perhaps just move the clip down one notch on the needle will solve the problem.