Jet size help.

[Steve]

First of all Cool thank you for the info I dont know if I have the patients to try it this winter but maybe next.

Second what are you doing up at this hour you should be in bed.

Do yourself a favor. Work up the patience to do it sooner than next winter. The whole process might take an hour or two, and, when done, will make your whole riding season much more enjoyable.

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[nisom512]

Do yourself a favor. Work up the patience to do it sooner than next winter. The whole process might take an hour or two, and, when done, will make your whole riding season much more enjoyable.

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uhgggggg well I guess I will have to then......t.h.a.n.k.s steve.....

[TheCafeKid]

Reading the plugs, via "plug chops", at different RPMs helps you determine what jet sizes to use with your bike's configuration (pods, pipes, etc). You tune each carb circuit, adjusting jet sizes, to get the most efficient fuel/air mixture at each throttle position. This gives you smooth performance through the entire throttle range without flat spots or surges. It's an art and can take some time to get everything just right. I'm no expert. This is why I leave my bike all stock.


Thank you for your indulgence,

BassCliff

Just a slight correction. Plug chops have nothing to do with RPMs actually. It has to do with throttle position in relationship to the circuits of the carbs. RPMs will change with the amount of load the bike is under at any given throttle position. The throttle position however, is a constant. No matter what speed/rpm range you are in, the amount of throttle you give the bike dictates what circuit(s) the carbs are working under.

[nisom512]

Working on a similar problem myself, but it's the other way around. The bike I am dealing with has pods and a stock pipe.

My son's bike is similar to yours, with stock airbox and a pipe. We got it with 120 main jets, all others stock. By the way, your 180 air jets are stock, too. We have not done a lot of extensive testing yet, but his bike seems to be working well, so it's probably close. Your bike with mains one size larger and pilots one size larger will likely run just a bit rich, unless the header has a minimal ( or no) baffle. My son's bike has a decent baffle and fresh packing, so it's comfortably quiet with a good sound.

If you want to go with pods, you will probably want to go with 125 or 127.5 mains, your pilots should be fine.

How does it compare to a kit? What you have might be considered Stage 1. With the pods, you would want a Stage 3.
Why have we never heard of a Stage 2?

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So what do ya think of getting these? Mr. Steve

http://www.bikebandit.com/product/17044?m=6119&t=1

[Steve]

So what do ya think of getting these? Mr. Steve

http://www.bikebandit.com/product/17044?m=6119&t=1

I thought of doing that, but did this, instead,

Mikuni jets

It appears that the jets in the link from Bike Bandit are $12.15. Not sure if that's each or for a set of four. Either way, that's far too expensive.
While I was waiting for my computer to boot up, I opened the package that came from Z1 today (my link above). Seems that their jets are only $1.20 each.
Yep, that's right, I can get TEN jets from Z1 for the price of ONE from Bike Bandit.
The price of four jets and $4.95 shipping is still cheaper than one jet from BB.
(by the way, I ended up getting 122.5, hope they work OK. )

[nisom512]

I thought of doing that, but did this, instead,

Mikuni jets

It appears that the jets in the link from Bike Bandit are $12.15. Not sure if that's each or for a set of four. Either way, that's far too expensive.
While I was waiting for my computer to boot up, I opened the package that came from Z1 today (my link above). Seems that their jets are only $1.20 each.
Yep, that's right, I can get TEN jets from Z1 for the price of ONE from Bike Bandit.
The price of four jets and $4.95 shipping is still cheaper than one jet from BB.
(by the way, I ended up getting 122.5, hope they work OK. )

Sorry to sink your ship but that is for four I actually called them to make sure. but your buy is still less.

And wow thanks for the link I will get my jets from there now!!!

Oh and do ya think my bike may run best if I were to put the stock pilot jets(which I have) back in? The guy said he had a hard time keeping it running before he just left it.

[nisom512]

Sorry to sink your ship but that is for four I actually called them to make sure. but your buy is still less.

And wow thanks for the link I will get my jets from there now!!!

Oh and do ya think my bike may run best if I were to put the stock pilot jets(which I have) back in? The guy said he had a hard time keeping it running before he just left it.

i cant seem to find other sizes what is the link to the list of sizes?

[Steve]

Sorry to sink your ship but that is for four I actually called them to make sure. but your buy is still less.

My ship is still floating. The catalog listing is just not informative enough.
Nice to see that the price is not for EACH, but yeah, it's still more.

Oh and do ya think my bike may run best if I were to put the stock pilot jets(which I have) back in? The guy said he had a hard time keeping it running before he just left it.

If you go back and look at what I had mentioned in my first couple of posts, my son's '81 850G has stock airbox and a 4-into-1 pipe (of unknown manufacturer). We don't have the bike legally registered and insured yet, but we did stick some current plates on it and take it for a ride back in October. Except for a little stuttering at idle, which might just be cured by fine-tuning the mixture screws, it runs very nicely with stock pilot jets and 120 mains. We have not done any testing or adjusting since then, nor have we done plug chops, but it feels real good on the road.

With your current setup (which is similar to ours), your 122 mains should be fine, especially if your pipe is a little more 'open' than ours, which is well, baffled and silenced. My guess is that stock pilots would work well, too. If you go with pods, the mains will have to be upped to 125 or more, and your 47 pilots might work, too. Just guessing, as I have not had to re-jet to that extent, yet.




.

[nisom512]

hey that link you sent me, could you post a link to just the list of jets? cause I can only see the one jet you posted the 120 so if there is any way you could just post the page before that one would be great. I looked at z1 and couldnt find that page.

Oh and the Bike looks really nice!!

Thanks

JAke

[nisom512]

never mind I just got it......

[Steve]

hey that link you sent me, could you post a link to just the list of jets?

never mind I just got it......

For the benefit of everyone else that might be looking for jets, go to the Z1 site, go to their little search window and type in "Mikuni jets".

This link is where you will end up.

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[nisom512]

For the benefit of everyone else that might be looking for jets, go to the Z1 site, go to their little search window and type in "Mikuni jets".

This link is where you will end up.

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Nice idea steve

Yeah I titled the thread so that people who search could easily find good answers.

[Steve]

... people who search ...

What a concept.

Hope it catches on.

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[nisom512]

What a concept.

Hope it catches on.

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I dont see why that would be a good idea.

[Steve]

I dont see why that would be a good idea.

Yeah, I guess it would cut down on a lot of this senseless chatter.

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