For Sale XJ PARTS FOR SALE---FOR ALL MAXIM, SECA, AND TURBO MODELS

Hey Bill.....I must be slipping! But I'm glad it reached you in time for some weekend tuning fun. Good luck and let me know if I can be of any further help.

 

Chacal, I got my parts this morning (that's 2 days!), just in time to tear into the carbs.

Thanks again! Now I have something to keep me occupied for the rest of the day

 

My parts ward off boredom and idleness, which are well known to be the work of the devil.

So bless you, stereomind, now go forth, be fruitful and synchronize.

 

Re: XJ PARTS FOR SALE---FOR ALL MAXIM, SECA, AND TURBO MODEL

Len comes through again!

One of my parts was backordered, so Len flew to Tokyo and took the Yamaha Vice-President of Parts (Dinosaur Division) out to dinner, fed him full of Sake&Tonics and managed to get my part even though there are apparently fewer than 4 available in the whole world!

And then he Express Mailed it to me (at no small expense, I might add)!

Wow, thanks a bunch, Len! Tell Hiromi "Domo arigato", too!

P.S. Extra special no B.S. thanks for the Express Mail, Len... :wink:

 

Floogle, you are so very welcome, and actually I'm a bit embarrased about the whole situation, it took far too long to obtain that one silly little seal. I appreciate your patience.

And I don't think it was the sake and tonic, but rather the repeated 2x4 head smashes that convinced him to cough up those small round rubber seals. Tough love for parts people works wonders!

Now if I can get Interpol to stop looking for me.....

 

Thanks Len! Got the parts fast and they look good, now only if I can install correctly this time (there's not much information in my manual on it).

 

Ordered Friday, received Monday. ZOOOMMM!!!

Working on mounting the Dyna coils today. Working on cleaning/sealing the tank too though. Watch for video and photos later in another thread.

 

Thanks guys, we like your orders to" bounce off the redline" during the delivery phase.....

Seansbw, if you have any questions on install, fire away!

 

Re: XJ PARTS FOR SALE---FOR ALL MAXIM, SECA, AND TURBO MODEL

Hello, I'm new here so please bear with me. Spent all this week reading this forum. Excellent info here. Just registered!

I need info before I order parts. I am working on carbs (setting 8 years on bike)

The bike, 82 XJ750J Maxim. Bike has K&N air filter and 4 into 1 exhaust.

Is it required to rejet with larger jets just because of this exhaust?

These carbs have factory jets, 2 of which are broken on top.

This is my first attempt to work on my own bike.

Anyway as soon as i get this info I can order jets i need.

Thanks in advance for all the excellent content on this forum.

Rick

 

Greetings, Rick

and welcome. I'm pretty new here myself, but I can tell you this is a great group of guys (and gals?). Anyway, after sitting that long, you'll need more than jets to rebuild the carbs. Chacal has all or almost all the parts you need to do the job. His prices are resonable to great, his service and advice are awesome. Don't waste your time trying to piecemeal the project. Get all the gaskets and o-rings to do it right the first time and clean, clean, clean.
I'm looking forward to the jetting answer myself - my only mod on the 550 is a 4-1 for which I never rejetted. To help your search on the forums for advice on jetting with K&N's, I believe here thay are mostly called 'pods' and seem to be the source of lots of trouble!
Best wishes for you on your rebuild and keep us all posted.

 

Hi Ricklees, yes, youwill definitely need to re-jet for the combo that you are running. It's not so much the exhaust changes, but the intake changes ALONG WITH the intake changes (K&N filter) that increase the airflow through the engine, thus requiring more fuel to go along with that extra air (and thus a need for bigger jets). Be aware, it's as much an "art (that means "trial and eror") as it is a science. And as saltracer says, just go ahead and plan on rebuilding the carbs completely, they are toast internally (dirty) if they have been sitting that long, and perhaps they have already been re-jetted by the prvious owner. Send me a private message (PM) and I'll send you a long list of some of the parts you'll be needing.

In the meantime, here's some info on what re-jetting involves:

WHAT ABOUT RE-JETTING FOR PODS, ETC?:

It's a question we get asked often and unfortunately, one that we cannot answer honestly about your specific bike besides with "it depends".

Which is a nice way of saying "you're about to enter the seventh circle of hell......."!

Carb jet tuning required by aftermarket modifications is somewhat of a black art, part science, part skill, part luck. It depends on the current state of tune of your engine, your altitude, the mix of aftermarket parts on your bike, etc........a lot of variables.

The best advice we can offer is: Just Say No. Don't do it! Leave everything stock!

But, since most people---with good reason, I might add---don't always listen to our well-intentioned advice, then the next best recommendation we can offer is: "if you want more power get a bigger bike!".

And since that doesn't cut it with many owners, either, for the remaining stalwarts out there who insist on "experimenting" with aftermarket intake and exhaust systems, here's the best information that we've come across to give you some GUIDANCE, which you should take as just that, and not as ANSWERS, because it isn't!





MAIN FUEL JET SIZE CHANGES NEEDED PER TYPICAL MODIFICATION:


Typical Exhaust Changes:

+2 main fuel jet size for custom 4-into-2 exhaust

or

+4 main fuel jet sizes for 4-into-1 exhaust

or

+4 main jet sizes for no muffler (open headers)


Typical Intake Changes:

+2 main fuel jet sizes for single K&N filter (inside a stock airbox)

or

+2 main fuel jet size for drilling holes in the airbox with stock filter

or

+4 main fuel jet sizes for individual pod filters (no airbox)


Additional changes:

- Add up all the main fuel jet size increases and subtract 2 sizes.

- Decrease main fuel jet size by 2 sizes per every 2000' above sea level.

- Under a mis-match condition, such as when using pod filters with a 100% stock exhaust, or 4-into-1 header with stock filter and air box, then subtract 2 main fuel jet sizes.


PILOT FUEL JET SIZES CHANGES NEEDED PER TYPICAL MODIFICATION:

Pilot fuel jet size changes are related only to the change in main fuel jet sizes according to the main fuel jet size formula described above. Note that this pilot fuel jet rule is for the main fuel jet size change BEFORE any main fuel jet altitude compensation is factored in:

Increase the pilot fuel jet size +1 for every +3 main fuel jet size increases.

Additional changes:

- Decrease pilot fuel jet size by 1 for every 6000' above sea level.



PRECAUTIONS:

- Make sure your carbs are in perfect working order before making jet changes....meaning fully cleaned internally and rebuilt, operating properly in their stock configuration, proper sized air jets and needles, etc.

- Check plug color often and adjust as needed, 2 main fuel jet sizes at a time and 1 pilot fuel jet size at a time. Bright white plug insulators are a sign of an overly lean fuel mixture condition and WILL cause damage to your engine over time, up to and including engine seizure!

- Synch the carbs after each jet change.

- Make sure the floats are set correctly

- Seriously consider purchasing a Colortune Plug Tuning kit.

- You may find it necessary to make changes to the size or shimming of the main jet needle. There are no guidelines on what or how to do these changes, this is true trial-and-error tuning!




EXAMPLE:

A 1982 XJ750RJ Seca using an aftermarket Supertrapp 4-into-1 exhaust and a single K&N air filter in the stock, unmodified airbox. Bike is primarily operated at an altitude of 2600 feet above sea level.

XJ750 Seca Stock Carb Settings:

#120 Main Fuel Jet
#40 Pilot Fuel Jet
Y-13 Needle


MAIN FUEL JET SIZE CALCULATIONS:

Changes made:

Exhaust:
4 into 1 with Supertrapp = +4 Sizes Main Fuel Jet

Intake:
K&N Pod Filters = +4 sizes Main Fuel Jet
----------------------------
Equals: +8 main fuel jet sizes above baseline
Subtract: -2 main fuel jet size per formula above
----------------------------
Equals: +6 main fuel jet sizes due to modifications, thus:

Stock main fuel jet size is: #120
+ 6 additional sizes
= a #126 main fuel jet size
---------------------------
Subtract: -2 main fuel jet sizes for Altitude of 2500' Average

= #126 calculated from above
-2 jet sizes for altitude adjustment

= a #124 main fuel jet size.


PILOT FUEL JET SIZE CALCULATIONS:

The formula is: +1 pilot jet size increase for every +3 main jet sizes increased.

Stock pilot fuel jet size is: #40
+ 2 additional jet sizes (since we went up +6 main fuel jet sizes before the altitude compensation was factored in):

= a #42 pilot fuel jet size.

Note that no altitude compensation is needed on the pilot fuel jet since our elevation is less than 6000' a-s-l.


------------------------------

RESULT:

A #124 Main and #42 Pilot is A GOOD STARTING POINT.

******************************************************


For further insights and understanding, the Holy Grail (meaning: the whole miserable, un-varnished truth of what a real chore carb tuning is going to be, written by people who actually know what they're talking about, rather than by people who are trying to sell you something) can be found at:

www.factorypro.com

and then click on the "Product Support/Technical Support" link at the top of the page, then on the "Motorcycle Tuning Tech" link, and then the "CV Carb Tuning" link........and then read, weep, study, and do....if you still dare to! As you will soon realize, it's takes quite a bit of effort to properly tune a carb to its optimal performance----another reason why we don't suggest using pods!

 

Re: XJ PARTS FOR SALE---FOR ALL MAXIM, SECA, AND TURBO MODEL

Thanks again Chacal. Parts got here incredibly fast and was just what I needed. I'm already putting together a list for my next purchase. Great customer service and very speedy.

 

Thanks Shad, let me know what else you need!

 

HEY HEY HEY!!!!!! Got my backordered brakelight switch today...well actually yesterday. Thanks guy!! Always appreciate your service and really liked the fact you told me about the back ordered part before my last order even got here.

 

Thanks again Len for the speedy service and good advice. I have all the carb parts - this weekend is rebuild time. Then maybe my idle will finally be 1050

 

Hey guys, you are very welcome, and my thanks to you, too.

 

Re: XJ PARTS FOR SALE---FOR ALL MAXIM, SECA, AND TURBO MODEL

I neede parts that TWO dealers said were not stock items and didn't exist.....
Fortunately, we have the resident parts guru Chacal!
Brand new clutch boots that "don't exist" are now in my hands.
Thanks Chacal

 

Re: XJ PARTS FOR SALE---FOR ALL MAXIM, SECA, AND TURBO MODEL

Dealers----huh!! Who needs 'em?

Thanks maz, let me know if there's anything else that I can assist you with!

 

Re: XJ PARTS FOR SALE---FOR ALL MAXIM, SECA, AND TURBO MODEL

Another thx to Len (chacal) for another great order

Great to deal with

Again, many thx

 

Re: XJ PARTS FOR SALE---FOR ALL MAXIM, SECA, AND TURBO MODEL

Ordered over the weekend. Shipped Monday, recieved Wedneday!

THank You so much Chacal.

I just wish I had ordered everything I needed, Lol