Need a crash course on jetting XS11G . . .

[mfarrington]

First time XS11G carb rebuild project. I broke down my carbs and soaked them in Gunk carb soak. Blew them out real good. Can see through my main jets. But now what?

I need a crash course on jetting.

[DGXSER]

Well, first off, I hope you did not soak the butterfly seals in the cleaner. TC always states that as a no-no. The cleaner will ruin those seals and they are a PITA to replace.

You stated you broke them down, so that would suggest you have removed the main jet and washer, the pilot idle jet, the floats, the float needle seat, the idle air jet, the vacuum slide and needle valve, and the emulsion tube, and the idle mixture screw including its little washer and rubber seal. All of those parts, with the exception of the rubber parts, can and should be soaked in cleaner.

Now, you asked about jetting, why do you think you need to rejet? How was it running? What size jets are in it? Stock for most G models was 110 or 120 mains with 42.5 pilots and 185 idle air jets. What modifications are on your bike? Are you running stock exhaust? If not what type do you have. Do you have individual pod filters? Have you done a big bire kit? Any of these things can change the jetting. There is actually a good tip chart on the site somewhere, tech tips or FAQ that describe what size jettign is recommended based upon your modifications.

[tarzan]

What he said

Also,why are you worried about the jet size?Did you change exhaust or intake?
If the jets you have are good ,I would use the jets you have ,then after it runs find out if it needs a re-jet.

[mfarrington]

Thanks for the quick replies.

DGXSER, thanks for the detailed breakdown. I kept the butterflies out of the juice. The reason for the quiry on jets is related to the history of the bike. I bought it last month, local, for $800. Full hard bagger, black, with vetter windshield, 6000 (!!) miles. Still has the original working radio with 8-Track player. The first owner must have loved this bike, but I didn't buy it from him, I bought it from a fellow that rode it seldom and didn't give it any love for the past few years. It was rideable at purchase, but required a very extensive warmup period, which often involved lots of restarts. Once thouroughly warmed up, it ran ok. Prev owner said he'd never had the carbs cleaned.

So, I haven't had a good history with this bike. I thought I'd start with the carbs and go from there.

Also, how do I know if I need a re-jet? (I'm not much of a mechanic, but I'm working on changing that.)

Thanks to all,

[DGXSER]

Hey Mike,

Sounds like you have a bone stock machine there. I doubt you need new jets, but you may well need to clean the carbs up good. I would suggest the steps above for complete tear down and cleaning. Also use spray can carb cleaner through all the passages of the carbs!

[Ken Talbot]

Try it just with clean parts first - you may be surprised how well it will run. Sync the carbs and do a 'colortune by ear'. Then run it for a while to see what it is doing. Then, the performance issues you find after al that will tell you which way to go with which jets, etc. Work on it one variable at a time and you'll save a lot of hair.

[digitalsam]

If you switch to pod air filters, is there a certain jet that you need to use? What happens if you don't rejet?

[motoman]

Unless you WANT a jetting nightmare and not run perfect through ALL rpm ranges DO NOT put pods on that scoot. Trust me, the Yammy engineers have alredy figured out the BEST all-around combination for you, intake system AND exhaust. Do NOT FUBAR a perfect stock set-up. If you want a rocket, by an R1 or a V-Max to go with the XS.

[xs11bobber]

I believe Pods requires 1 size bigger main jet, but I've heard of people getting away with stock. If you don't rejet and tune it right after any mods from stock, then you're going to be throwing $$$ down the drain. You're fouling plugs or throwing your fuel to the wind. It doesn't look like you need to worry about a rejet though. Main thing is clearing the pilots and emulsion tubes correctly. Insert triple clean here, lol

[digitalsam]

I don't really like the look of the pods, it is the ease of access to the carbs that is a PITA (Pain in the arm?) with the overly large stock air filter box.

I guess I will leave the box on the bike. Thanks for the input.

[Ivan]

Unless you WANT a jetting nightmare and not run perfect through ALL rpm ranges DO NOT put pods on that scoot. Trust me, the Yammy engineers have alredy figured out the BEST all-around combination for you, intake system AND exhaust. Do NOT FUBAR a perfect stock set-up. If you want a rocket, by an R1 or a V-Max to go with the XS.

I heartily disagree with your opinion on the pods.

[motoman]

Figured you would Ivan............dern, took you two threads for input........your slowing down.....

[DGXSER]

Sam,

I will say that once you pul and reinstall the carbs a few times with the air box, it gets pretty easy and quick. I can do it pretty efficiently from experience. But then again, once you get them cleaned up and tuned, you wont need to pull them again for a long time. Provided of course you add seafoam or such over winter or continue to ride over winter and such. JMHO.

[Ivan]

Figured you would Ivan............dern, took you two threads for input........your slowing down.....

Seems as if life just doesn't get any easier, so I am slowing down a bit.

FWIW, I have found pods to cause tuning to be much pickier than the airbox. I wouldn't say its hard to tune or that it makes the scoot run bad at all rpm ranges. Matter of fact, mine is running quite well now. I do have a dynojet kit in it though. That made a world of difference, but it was running quite well before. I am also of the opinion that the exhaust makes more of a difference than the intake. I have put much contemplation into it, and I think it is a combo of silencer volume and outlet diameter (backpressure?) that makes the stock setup so nice, as opposed to a straight through exhaust. It still baffles me, but i cant argue results.