Author Topic: Carb upgrade  (Read 372 times)

legacybrg

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Carb upgrade
« on: June 24, 2020, 07:42:44 AM »
Hi all, my '82 Xz has the original carb/airbox setup. Getting it to run well has been a real challenge over the last few years. Currently, idle is variable and, there is still the classic stutter rolling on power. Saying that, it's rideable and good fun. I can however obtain the OEM carb upgrade kit for a not unreasonable price. Is it worth it ?

Boomer

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Re: Carb upgrade
« Reply #1 on: June 24, 2020, 12:03:25 PM »
I found that even after install of the kit I had issues although they were not as bad. I changed out my mufflers and had a huge positive change. NOTE: The muffler swap was a conversion. Lots of work, lots of swearing, and even some blood.

legacybrg

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Re: Carb upgrade
« Reply #2 on: June 24, 2020, 02:08:05 PM »
Thanks for the advice.

fret not

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Re: Carb upgrade
« Reply #3 on: June 24, 2020, 02:18:44 PM »
By OEM carb upgrade kit are you referring to the replacement of the top of a carb?  There was a "kit" that replaced one of the carb tops.  I think you will have to go through a process of sorting your carbs.  Tiny passages in the carb bodies must be cleared of any foreign matter, then begin a step by step process of sorting them.

POD has laid out the steps to sorting the original carbs, and usually that should be sufficient.  However, there are some carbs that seem to have a mind of their own.  As you know, they are sometimes very "touchy", but should be able to be sorted. 
Some of us have resorted to transplanting other carbs to avoid the issues of the original carbs.  There is no really easy answer, one way or another you have to sort the carbs.
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MikeScoot

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Re: Carb upgrade
« Reply #4 on: June 25, 2020, 03:55:22 AM »
lolol Yep, "mind of their own" alright!
I have a spare set of carbs here but haven't yet resorted to resurrecting them - preferring to not be defeated by the ones I have cleaned and adjusted several times already.

I know it's a little off-topic but has anyone had good results (overcoming issues in looney carbs) by ultrasonically cleaning them?
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Prophet Of Doom

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Re: Carb upgrade
« Reply #5 on: June 25, 2020, 04:49:56 AM »
Hi all, my '82 Xz has the original carb/airbox setup. Getting it to run well has been a real challenge over the last few years. Currently, idle is variable and, there is still the classic stutter rolling on power. Saying that, it's rideable and good fun. I can however obtain the OEM carb upgrade kit for a not unreasonable price. Is it worth it ?
There aren't any "kits".  It's a road to only go down if you are happy doing light fab work.
I've not done it so can't comment on whether its worth it, but There is NOTHING wrong with the 82 carbs.  Clean stock carbs with 16R/11U jetting (120F/120R air jets) work really well till you get a hole in your YICS.

If you have variable idle my guess is you have unsynced carbs, and/or an air leak.

Fret was referring to this post http://ridersofvision.net/rovforum/index.php?topic=15295.msg140316#msg140316 , But it was more aimed at modifiers who need a new jetting to compensate.   For a stock bike just clean and adjust, (and change the pilot air jets).  Ultrasonically carb cleaning is overrated - as is the need for surgical cleanliness.  Just make sure the small holes are all clear.

For all carb work you need JIS screwdrivers.   Phillips drivers will ruin the screw heads.

Rikugun

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Re: Carb upgrade
« Reply #6 on: June 25, 2020, 06:40:52 AM »
Quote
For all carb work you need JIS screwdrivers.   Phillips drivers will ruin the screw heads.
I was watching a YouTube video not too long ago were the presenter discussed JIS vs. standard philips and mentioned the JIS standard would be discontinued at some point.  Anyone read anything about this? If it's true, the drivers may not be offered for much longer after that.  If you don't have a set, maybe now is the time.
It is far better to grasp the universe as it really is then to persist in delusion, however satisfying or reassuring.  Carl Sagan

MikeScoot

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Re: Carb upgrade
« Reply #7 on: June 25, 2020, 07:33:46 AM »
That's a bit hard to imagine. Pretty much everything of quality made by Japanese manufacturers adheres strictly to various JIS, and I haven't heard or seen anything to indicate they will abandon any aspect of them anytime imaginable.
I will, however, consult with some Japanese engineers I know.
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Walt_M.

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Re: Carb upgrade
« Reply #8 on: June 25, 2020, 07:41:46 AM »
There is nothing wrong with JIS, just use the proper tools.
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injuhneer

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Re: Carb upgrade
« Reply #9 on: July 27, 2020, 08:18:03 PM »
lolol Yep, "mind of their own" alright!
I have a spare set of carbs here but haven't yet resorted to resurrecting them - preferring to not be defeated by the ones I have cleaned and adjusted several times already.

I know it's a little off-topic but has anyone had good results (overcoming issues in looney carbs) by ultrasonically cleaning them?

Yes.

- Mike O
injuhneer
1982 Yamaha XZ550RJ
--------------------------------------------
1975 Honda ST-90 (164cc stroker)
1972 Kaw GT4R
1978 Kaw KM100
2008 KTM 450 SXF

injuhneer

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Re: Carb upgrade
« Reply #10 on: July 27, 2020, 08:22:53 PM »
Hi all, my '82 Xz has the original carb/airbox setup. Getting it to run well has been a real challenge over the last few years. Currently, idle is variable and, there is still the classic stutter rolling on power. Saying that, it's rideable and good fun. I can however obtain the OEM carb upgrade kit for a not unreasonable price. Is it worth it ?
Ultrasonically carb cleaning is overrated - as is the need for surgical cleanliness.  Just make sure the small holes are all clear.

For all carb work you need JIS screwdrivers.   Phillips drivers will ruin the screw heads.

I won't go back to manual cleaning. The ultrasonic bath I have in the shop gets used alot. If the carbs are properly suspended it does a fantastic job. Only a few shots of air needed then to clear and dry the innards.

Prior to that I used the Yamaha carb cleaner.

Now it is just hot water and a bit of Simple Green.
- Mike O
injuhneer
1982 Yamaha XZ550RJ
--------------------------------------------
1975 Honda ST-90 (164cc stroker)
1972 Kaw GT4R
1978 Kaw KM100
2008 KTM 450 SXF

Prophet Of Doom

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Re: Carb upgrade
« Reply #11 on: July 28, 2020, 07:04:53 AM »
If the carbs are properly suspended it does a fantastic job. Only a few shots of air needed then to clear and dry the innards.
I find the ultrasonic cleans the outside OK, but doesn't budge crusty varnish on the inside of passages. 
I like to follow up with chemicals, pipe cleaners and nylon wire before the air.

injuhneer

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Re: Carb upgrade
« Reply #12 on: July 30, 2020, 01:59:58 AM »
I suspect that most single frequency fixed wattage cleaners don't do a good job. Multiple frequencies and modes (pulse, sweep, etc) make all the difference.

I started with a small cleaner and eventually upgraded to something with the power and modes to do the job.

- Mike O
injuhneer
1982 Yamaha XZ550RJ
--------------------------------------------
1975 Honda ST-90 (164cc stroker)
1972 Kaw GT4R
1978 Kaw KM100
2008 KTM 450 SXF

MikeScoot

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Re: Carb upgrade
« Reply #13 on: July 30, 2020, 05:41:46 AM »
I suspect that most single frequency fixed wattage cleaners don't do a good job. Multiple frequencies and modes (pulse, sweep, etc) make all the difference.

I started with a small cleaner and eventually upgraded to something with the power and modes to do the job.

If I am able to find someone local with such a cleaner, what kind of preparation is required before handing over the carbs for cleaning?
Thanks,
Mike
Luther had his dream,
But I've got my Vision.
His got him into strife,
Mine just takes me fishin'.

legacybrg

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Re: Carb upgrade
« Reply #14 on: July 30, 2020, 02:56:28 PM »
Hi all, just an update - upgrade kit obtained and installed. Photos attached showing parts list and kit number. 'Bike started well and after adjusting idle ticks over nicely. Ran out of time today to take it for a ride so, a proper assessment is pending. Fingers crossed, watch this space!

fret not

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Re: Carb upgrade
« Reply #15 on: July 30, 2020, 03:48:35 PM »
Always interesting what might surface as "parts available" for an obsolete model. 

JIS = Japanese Industrial Standard
Retired, on the downhill slide. . . . . . . . still feels like going uphill!

Prophet Of Doom

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Re: Carb upgrade
« Reply #16 on: July 31, 2020, 05:11:50 AM »
The kit has a replacement #135 Pilot air jet.  There was some speculation here that the replacement (front) top had a #130 installed but I suspect a #135.
Since you are the only owner of a mod kit I've ever hear of would you mind checking that?

injuhneer

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Re: Carb upgrade
« Reply #17 on: August 02, 2020, 12:51:05 PM »
It would be nice to get a full scan of the parts sheet.
- Mike O
injuhneer
1982 Yamaha XZ550RJ
--------------------------------------------
1975 Honda ST-90 (164cc stroker)
1972 Kaw GT4R
1978 Kaw KM100
2008 KTM 450 SXF

Prophet Of Doom

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Re: Carb upgrade
« Reply #18 on: August 04, 2020, 01:58:25 AM »
It would be nice to get a full scan of the parts sheet.


Go to the Resources topic and look for it there...


Service GuidesXZ550 (11J) Intake and Carburetor Modification Kit 1982 Models