Carb Syncing instructions?

Ok folks,
I just aquired some home-made gauges and a YICS tool from a co-worker
at no cost to me, yes they were FREE.
He sold his XJ.

My question is,
Where can I find detailed instructions on syncing the carbs???

After they are cleaned of course.

 

Haynes manual outlines the process rather nicely. I am aware of one or two posts here (I think Rick did one) on how to. Search it. The XJCD may have it as well but not having received mine yet, I wouldn't know.

 

Search: Carb Sync ... I think I wrote-up a pretty detailed run-through on xync.

The Loooong and short of it is:

Match #-1 to #-2 By adjusting the screw of #-1
Then ...
Match #-4 to #-3 By adjusting the screw of #-4 (as 3 has no adjustment)
Then ...
Match #-2 to #-3 By adjusting the screw of #-2 (#-1 is attached to 2 and will go right along with 2 and be syncronized.)

Oil-up and "exercise" the sync screws before hand to make the process easier and nore precise.

 

Uhhh... recently read a Tech article on carb synchronising, in a Magazine by a long time Moto Mechanic.: Paraphrased

You won't need elaborate synchronising equipment: you will only need a single drill bit. Use the bit as a gauge between the Butterfly and the throttle bore Turn the sync screws to to adjust the butterflys evenly The smaller the drill bit the more accurate the sync. This will synchronise the carbs well enough to not need further attention.

Ain't life simple when you know how

 

Try this link.....

http://771doug.netfirms.com/synch_page.html

it's for another brand, but gives you an idea with pictures too!

 

That technical article saying that once you have "mechanically or physically" syncronized the carbs by just using the smallest drill bit you can find is correct ... up to where it states that no further adjustment will be required.

"Bench syncing" the rack will get you "In the ballpark." But, if four of us decided to meet "In the ballpark" we'd all be in the ballpark ... but, one might be in the Grandstand, another might be in the Bleachers with the other two somewhere in the park where we'd all have to yell to communicate.

Hooking-up to the gauges and setting the sync with the tool in place assures that we're in the ballpark and all four of us meeting right smack dab on second base!

It's when the carbs are all synced to allow for performance related variables; and drawing their vacuum's allowing for those variables ... as those vacuum's strengths are precisely measured by their effect upon the columns of mercury (or other accurate devise) that they can be syncronized to have all four standing on the same bag.

 

Yer absolutely right.. No arguement except for a small caveat.
These ARE 20 year old motors, at least. The errr.. parts (all of them) have seen some wear. The performance aspects of these units.. when brand spanking new.. were average at v best... no knock, just facts. Perfect sync would be mandatory onna 150 hp Moto.. arguably not so intensely necessary onna 60 hp one (now perhaps a 40hp one, it's surprisingly old, remember .
But hey.. whatever gives one pleasure,
Wrenching, after close to 4 full decades of it, for me,
has lost almost all allure I still do it.. but no longer willingly.

 

I've got 45-years in. Sometimes I get frustrated when I have to do a job for somebody that can't wrench, and let a situation where an adjustment would have prevented needing to spend time doing corrective measures.

Pulling a wheel and installing a rotor to go along with brake pads always gets me worked-up pretty good.

Most recently, a kid wanted to bribe me to put a new rear tire on his bike.
He had to bring his new bike in for service, soon. The rear wheel was showing shiny spots where he lit-up the tire right down to the steel belt. Evidence of abuse voids the warranty.

I should have soaked him for swapping-out the rear tire ... but, I figured he deserved what his dad would have to say.

I bet he got somebody else to stick the tire on the R6, anyway. I couldn't get in the mood.

 

Danilo, I am surprised to hear of your slip into apathy. You have a gift to share, take happiness from that and spread the wealth around. I hope something comes along to spark your interest back into a healthy flame!

 

I know where Danilo's coming from. Sometime's the XJ-Forum gets to be like being the trainer for a sports franchise. The guys are all coming-in with the same injuries, game after game. It would be nice to have a different challenge every now and then.

Then, there's the "No bike - just type" element to it. We have to try and figure-out what's going-on with somebody's bike without being able to look for ourselves.

Take the 4-Hole seizure issue that popped-up in the discussions, here, for a bit. Personally, after all the mystery and discussion, I'd like to have that engine plunked-down right in front of my toolbox and not do anything else until I satisfied my curiosity about how four piston skirts suddenly melted without any warning at all. Curious; My dear Watson. Curious.

I don't agree with the notion that these engines; magnificently engineered and manufactured, primarily with life-long, strong, aluminum alloy and billet aluminum, developed for high-performance -- were anything but top-shelf upon leaving the joint where they got assembled. Japanese work ethic would never allow that to happen.

Roll one into my garage. I don't care what condition its condition is in.

When I get done with it ... I'll run-ya fer slips!

I'm going in to have ColorTune tattooed right under the Tuning Forks logo I have branded on my shoulder!!! : )

No. I'm not. And, no I don't.

 

I hear you Rick. Nothing beats having the issue sitting on your bench, much easier to troubleshoot, no doubt! These machines were very well engineered, can't think of anything I could add. I rolled mine into my garage last week but have yet to have had time to do anything to it. I'm itching to get started but the honey-do list is still calling my attention. In time I guess... in time.

 

Thanks guys, Ill keep searching.
And Rick, I see in the General Discussion you posted a "Single gauge Sinc"
I might try that if all else fails. Thank you.......

 

Must disagree with that. The 1981 Seca set a record for stock 750cc class. It was handed over to the motorcycle press and clocked by them under testing at 11.99 sec. That made it the fastest 750 off the showroom floor and the first to break the 12 sec mark. Granted te title didn't last long and the performance is lack luster compared to today's 600cc engines.