Throttle shaft seals

Going to replace the throttle shaft seals on a 1982 XJ550. On inspection i found that the seals can go in face up or face down. I guess the PO has had them out to. On the outer seals on 1 and 4 have been put in two different ways, cup up and cup down. What is the proper way to install them.Thanks Dirty

 

I guess nobody had replaced them on this forum. Off to search the web.

 

Many have changed them in the past and will be happy to share the info later, but hey, it's Christmas Day !

 

If you bought the X profile throttle shaft seals then orientation does not matter. If you bought the V profile seals, then the open part of the V goes towards the outside of the carb body.

 

I am getting them from XJ4ever. HCP38BSET8 Aftermarket Mikuni throttle shaft SEALS.

 

I'd send a message to Len....guaranteed to get the correct answer!

 

Got with Len at XJ4ever, got the order in on Christmas day and a email back from him the day after. Parts where on there way Monday. Got the carbs broke down with lots of pics and a tray to make sure I get the right parts back into the correct carb. That's service with a smile. Thanks Len

 

So, what was the answer? Which way are they supposed to go in?

 

the cup or V side is facing out, flat side goes inward. Forgot to add that. Len had the answer. Man has a wealth of knowledge when it comes to the XJ bikes. Dirty

 

That's Len!

 

And Chacal! Absolutely nothing wrong with inquiry from another reliable source but k-moe did answer the question. Just saying. Speaking of other reliable sources...where's Polock?

Gary H.

 

Yup, K-moe knows his stuff.

So does Len ( and Chacal )

Dave ( and Fox ) -snicker-

 

Parts arrived in two days, Now for the rebuild. Thanks Len

 

I got the carbs back together, seems the springs placement was the most confusing. The small brass washer with the ears on the #2 got me a bit baffled for a minute or two, thanks for the PM Len. I'm not use to a 4 bank of carbs. Feeler gauged the butterfly's to the same spec. Don't know where to place the idle screw for start up( closed or open, how many turns out) Going to get 100% gas to to a trial run in a couple days. The idle mixture screw is set at 2.5 turns out( any advise here is welcome). Jets are 37.5 idle, 120 mains, 170 idle air. Thanks Dirty

 

The idle speed screw should be set so that the #3 carb (and all the rest) is still in it's bench synch position. That is your baseline.
The 2.5 turns out for the idle mixture screws is correct. You may end up closer to 2.75 turns out once you colortune.

 

look at the two holes at the top of the engine side, just above the butterfly to set the sync. the idle is set at both holes open then about one hole diameter more.
2.5 turns out is good 2.75 might be better

 

When you have your rack benchsynced, you want to have the butterfly opened enough that the first hole is half covered. ( there are three holes there) I turn the idle screw in far enough that no butterfly is closed to start with.... Then I get them as close as I can by eye before closing them, making sure that #3 is just a hair more closed than the others. That way no other butterfly can cause others to hang. Once they are close, I close it down and set #3 at half way over the hole. Make the others match.

It sounds like a long process, but takes only a couple minutes....

Here's pics:
Three holes-

Here'a half-covering the first hole:


Obviously from a 550 rack that is waiting to be cleaned---lol

Dave F

 

Got the bike to run but cant find idle. It has good throttle response if the idle is set low. Not using stock air box, going to try that next. Shaft seals and fuel O-rings made a lot of issues go away. Turned out idle mix to three turns, no difference than 2.75. No 2 carb bowl overflowed. got to find a way to sync the carbs. Did the light test and feeler gauge on butterflies before install. Getting close. Turned cold. Got to get in the shed before snow fall. Dirty

 

1-Did you set ALL idle mix screws to 3 turns or just one?
2-Are you really talking about idle MIX screw, or idle SPEED screw?
3-If you have a carb overflowing, you still have either a float sticking open, or a float not adjust properly yet.

Did you clean the carb passages for the idle circuit in EACH carb?

Did you clean the enrichment wells so that you get a 5ft stream of carb cleaner unexpectedly in your eyes?

Etc.... Etc..... Etc.....

 

Preach it Brother Dave.
That man needs to go to Church!

Dirty, it sounds like you may have only addressed only a few items on your carbs. You need to go all the way with them and get a proper airbox (what are you using now?)

Get holy:
http://xjbikes.com/forums/threads/in-the-church-of-clean.14692/

 

Carbs were dismantled and thoroughly cleaned. This isn't a dirt and grim problem. I'm thinking I need to go back to the OEM Airbox and 165 air jets. Been busy working on the 58 Panhead clutch hub. Got to get a carb sync tool. These Quad carbs are new to me, but I will figure it out eventually. thanks for all the input.

 

when you first fill the carbs up you have to tap the bowls with a screwdriver handle to prevent fuel over flow if that does not work for you then you have problems inside the carb