carb air jet specs anyone?

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Re: bike back in shop.... *anger* anyone know these questions?

Air Jets were bad???

I don't know what the "Half Life" is for Solid Brass ... but I know its way longer than a hundred years.

AirJets are Brass. They don't "Go Bad"

You can get fork seals and retain the Dust Covers ... yes.

The tire change is unrelated to Carbs and Forks ...
New item on a Work Order.

But, they shouldn't have let you leave on a Bad Tire.

 

Re: .

Time to put on your tinfoil hats, folks... the title and body of the original post got changed to dots.

*THEY* got to him! :mrgreen:

 

Re: .

na, just very agrivated... They say:...... need two jets per carb. 4/8 are available @ 12.95 each. The other 4 discontinued. Why do i need them you might ask.... Because they "look" too big. No, they dont have a book. "This is what it must be."
So, me, i thought about it, and asked if they used a YICS tool.... No. They dont need one, they have a tool to synch the carbs.... I must be stupid and they must know everything... They are the mechanics and its not like i would actually try to learn anything about my bike.

I tried for about an hour just to get them to type in YICS tool on the internet. No avail. I am going to call the owner tomorrow and give my advice once again. FOOLS!!!!!!! They didnt even look it up!

By the way, does anyone have the specs on how big the opening on the air jets are supposed to be? I dont know why they would thing someone would drill them out.... Unless they did it. That is probably a possibility.

 

1982 XJ750-J

Carb: Hitachi HSC32, Model 15R00
Main FUEL Jets: #120
Pilot FUEL Jets: #40 or 0.9mm
Main AIR Jets: #80
Pilot AIR Jets: #225
Air. Comp. Jets: ?? (probably #36)
Starter Jet: #40
Main Jet Needle: Y-13
Float Valve Seat: ~2.0mm (.079")
Idle Speed: 1050 rpms
Throttle Valve Position: 13-degrees
Float Level: 3mm +/- 1mm (.118" +/- .039")
Pilot Outlet Size: ??
Vacuum Pressure @ Idle: 185mmHg +/- 10mmHg
24.7kPa +/- 1.3kPa


I've got new and some used jets for your bike---main and pilot, air and fuel. But they probably don't even need replacing as long as they are the correct size, since they don't ever "wear out" (unless someone really mauled the head, or if someone did drill them out in a past life).

I also have the YICS tool available...maybe you can buy one and show your shop what they look like and let them rent it from you every so often!!

P.S. you really need to find another shop. The service people don't care because the owner doesn't care----I'll bet you anything on that.

P.S.S. fuel jets are about $3.00 - $3.25 each new.......

http://www.xjbikes.com/Forums/viewtopic ... rt=45.html

 

Thanks, i will tell the shop the specs (though i doubt if they have been drilled out) and if i need them i will pay good for the parts and shipping. If i need them and send you 100-150 I'd be getting off cheap.... Either way, i will probably end up saving Plenty of dough...

Pretty sure that they just don't know what they are doing in reguard to the YICS.

 

Thanks, unfortnately didnt read the rest of the post, i know they have ovecharged me for everything, but it is the only shop close. Since I have already paid for the work, I am going to make them fix this damn problem. They Will get the tool and Will get the carbs done right. This is california.... The land of frivilous law suits... A real law suit will go a long long way.... Just the fact that they would work on it without a book says enough for me. At least next time I will know better. And at least it went out this soon. That ways they cant says that it aint their fault.

One reason I know they are full of shit on the "drilled out air jets" is that it ran fine before it was parked. Why would it suddenly have problems when they get to it. They just want to make some money off of me from parts.

Really appreciate the advice and the help.

Jack.

 

No problem, just holler if you need advice or "ammo" to go in with.

BTW, when they say that they have a "tool" for synching the carbs, they are probably telling the truth. They have a set a synch gauges or what's called "synch sticks" (technically known as a "manometer") which allows them to read how much vacuum each individual cylinder is pulling ("synching" means adjusting things so that each cylinder pulls an equal amount of vacuum at idle). And they probably know how to use the synch sticks properly, it's not real hard to do, and all multi-carbed engines require periodic carb "synching".

The problem is that with these YICS engines, there is a chamber cast into/below the cylinder head that connects all four cylinders, and thus without the YICS tool, you can never synch the cylinders properly because each cylinder is always pulling some vacuum from all the other cylinders, thus you'll never be able to "equalize" each individual cylinder's contribution. That's the purpose of the YICS "port block-off" or "blanking" tool----it cuts off the vacuum signal inside that YICS chamber, and allows the manometer (the "synch sticks") to read each cylinder's vacuum pull individually, and measure each cylinder's contribution individually, and therefore adjust things ("things" meaning the butterfly valve openings on each carb) individually so that each cylinder pulls an equal amount of vacuum.

That's the good news. The bad news is that unless you have your valve clearances checked AND adjusted (if necessary), then synching with or w/o a YICS tool in place does little real good. I know you don't want to hear that! I didn't want to say that!! Bite my tongue!!!

FIND ANOTHER SHOP!

Robert, one of the board moderators, lives out in your area, I think....maybe he can recommend a known reputable place?

 

i am going to get a full sevice maintainance job done on it once i have the money. Not at that shop however... And i am sure that if they use the YICS tool then maybe the bike wont suddenly start smoking like this last time.... Carbs were alright and then just craped out. Probably needs valve adjustment done on it though.... I am bout ready to just park the thing for a few months when i get it back from the shop. So far it has just been too much money and not enough savings. Got this thing to save on gas/time. So far spent plenty and too much stress.

 

Understand the frustration. One of big points to learning to do it myself. Had a shop do a valve clearance/sync job on my Interceptor and it wouldn't start as soon as they handed it to me. It ended up being a shot solenoid. Typically, when you hand the keys to the customer, the bike should run. Seems it was my lucky day.

 

Stopped by the shop today, talked to the techie.... The guy in the front office pulled out one of the jets and it was clean inside, didnt look drilled out, in fact it looked like it was machined.... They did say that all of the jets are about the same size, they didnt pull out any more of them though. I am going to go back tomorrow when they have the book and check the clearances on them.

About the YICS tool, the techie said that it wasnt that important. They dont need it because their synchronizer hooks up to the boots from the carb to the manifold. It wont be that much of a difference. They wont buy a tool to use on just one bike. If they make one from the specs online then they will charge me for the parts and labor because they wont use it.

Is this bull? You do have to have that to do it correctly right? If yes, then since i paid for the service, they did it (unsatisfactory/incorrectly) and they refuse to get the tool after it messed up.... Can i now take it to another shop that has the tool and charge them for what it costs me? I wanted to punch that smug little brit.... i have the feeling he knew better than what he was telling me... If you take on a job, it isnt my responsibility to have the specs/ tools for them to do the work. If they dont have the right tools, then how can they take on the job?

 

All synch sticks hooks up to all four intake manifold boots, that's the only way to measure the vacuum pull from each of the individual cylinders. The YICS tool is inserted into the passage that TIES ALL FOUR CYLINDERS TOGETHER (vacuum-wise), and thus blocks off each cylinder from one another.

Without the YICS tool in place, each cylinder "shares" vacuum with all of the other cylinders, making INDIVIDUAL CYLINDER VACUUM READINGS MEANINGLESS.

This is BASIC SYNCH 101.

That's not what the Yamaha engineers who designed the YICS system said.....they said, in the service and technical manuals, that in order to synchornize the carbs one of the first steps is to insert the YICS tool into the YICS passage and activate the tool.

Wow, the techie knows more than the Yamaha engineers! I wonder where he got his engineering degree from?

Proper tuning of a YICS-engined bike requires the use of a YICS tool. Period.

It is 100% pure bs, and although your insistence is admirable, you aren't going to win this game with them. They don't care. Would it help if they held up a sign over the shop that said "Welcome Customer! F.U." ? That's pretty much their attitude.

P.S. their insistence on doing the job "wrong" means that such attitudes permeate every bit of work that they do. The overall attitude at that shop is "screw the customer, they're a pain". They'll do the absolute MINIMUM amount of effort in everything they do. I bet the shop is messy, too.

My best advise is to get your bike outta there as quickly as possible, and either find another shop or learn how to do it yourself (there's lots of info on how to do things on this forum). In the same amount of time you've spent jockeying with those clowns, you could have done it yourself, bought all of the tools you'll ever need yourself, and still be ahead. Plus you'd be out riding by now.

Keep us posted. Once you're done with them, maybe you should "name names" so that other people don't have to suffer at the hands of these people, either........

 

Might post the shop, give them another shot first though... I would buy the stuff myself, but I already owe 1100 on the work that I've had done to it. This is california though. If I have to, I will take it to another shop, have them re-sync the carbs, take pictures, get professional*** opinions and take their asses to court. I will go after their business licence, and report them to the better business bureau. It will take them months to get my foot out their collective @55es.... They are a motorcycle shop. They said that they could do the work. I paid them, they did bad job, i am giving them a chance to do it right. I dont care if they have to buy a special tool. They should have turned me down in the first place if that was the case. They worked on my bike without a manual and no specs. They are trying to bs me on a different cause of the problem. It is THEIR responsibility to get it running if they took my money. If they cant do it, they will pay someone else to. Ha ha ha. I can be a reall jerk when im angry....

 

jack...I sent you a PM with the info on the jets you need.........check your "inbox" on this website for details!

 

You are getting ripped-off. In a BIG Way. I hate hearing about "Shops" like that.

They are in it for your money. If you signed a work order they'll probably hold the bike until you pay.

Aside from all the legalities involved ... you might need a Lawyer if you let these guys persist in screwing around with you like they are!

 

deleted....I answered my own foolsih question!

 

And that is the only way to stop 'em doing the same to the next poor sod who trusts them to do it right!

Always give them the chance to put it right then stick it to 'em!