Thin Plastic Washers On Throttle Butterfly Shafts Shims

So, about those very thin plastic washers that are on the throttle butterfly shafts... How many of those should there be on a full rack of Mikunis?

The reason I ask is that chacal's for sale thread says there should be one of these washers outside each and every throttle shaft seal (for a total of eight), but I only got four of them off my rack when I took it apart. And due to the good condition of the four I DO have, I'm having a hard time believing that four of mine disintegrated over the years.

Not only that, but another data point is that the donor rack that I took apart ALSO only had four... So either they only used four of these things originally, or by some very coincidental stroke of bad luck, both my donor rack and my good rack both mysteriously lost four of them? (Presumably the SAME four?????) :roll:



So, were there really originally eight of them and I'm missing some, or were they really only used one per carb, and if so... where? I specifically remember them being under the E-clips on the two outboard carbs, so that's an easy answer, but what about the two inboard carbs? :?:

 

Rice.........I think you are exactly correct, and it's a misprint in our listings for the Mikuni carbs. The Hitachi's are the one's that use 8 per rack (2 per carb)............thanks for catching that!

 

Whew... Cool! Thanks for clearing that part of it up. At least that part of the mystery is settled which is half the battle. Now I just have to figure out where those last two washers go.

So... Anyone have a virgin rack they can take a look at? (And yes, I AM talking about motorcycle carbs...) :lol:

 

Having just had my Mikunis apart less than a month ago, I can advise that I have no clue how many plastic washers there were. Good memory.........but very short! I did take some good photos though. I can identify 4 plastic washers in the photos. I'd guess that that's all there are.
#1 carb

#2 carb

#3 carb

#4 carb


Hope this helps.

 

RangerG,

Yes! That helps immensely. Thanks!!

So... There truly are only four of them on a full rack and a good way to determine the correct the location is to remember that On the Mikunis, all four of those thin washers go on the opposite the butterfly return springs.

That's what I thought, but it's sure nice to have confirmation.

Thanks again for taking the pictures I should have taken!

Burnarr

 

I've got two bikes and two spare racks of carbs, only one of which I'm sure has never been apart. Now I gotta go home and look at all of them.

Thank you both, sincerely.

 

Haha! Glad to help! :lol:

While you're at it, take a look at the location of the return spring on the #2 carb. The one just to the left of the butterfly in this pic:



I tried hooking mine on the throttle linkage where the little hook/tab arm was (you know... where it looks like it belongs) and the return force was clearly not enough.

Because of that, I hooked it to the next outcropping and that seemed to work OK, but looking at this pic, it looks like it's hooked someplace different. I mean, mine seems to work OK, but I'd just like to be sure... Can you take a look at that feature too while you've got them out?

Burnarr

 

Here are a few more pictures I took. I thought I'd have trouble hooking everything up again so I took pictures of any trouble areas.

Bottom of the springs between 2 & 3



Top of the springs 2 & 3



This should be the spring between 1 & 2



This should be between 3 & 4

 

Thanks again RangerG. That's some nice camera work!

It's the inconsistency that made me unsure where the #2 should go. Take a look at the other three springs...

This is the #1 return spring between 1 and 2.
Notice how it connects to the little hook shaped tab on the linkage:


This is the #4 return spring between 3 and 4.
Notice how it connects to the little hook shaped tab on the linkage:


This is the #3 return spring (on the left) between 2 and 3.
Notice how it connects to the little hook shaped tab on the linkage.


BUT... Also in the same pic above is the #2 return spring on the right.
Notice the unused hook shaped tab. Unlike the other three carbs, #2 does NOT connect to the hook shaped tab on the linkage:

In this pic, you can clearly see that the #2 return spring hooks to the outcropping for the sync adjustment screw:


It's different than the other three, and what threw me was that there even IS a hooked tab there for a spring. They just don't use it! :?

Anyway, I moved my #2 return spring to where your pic shows. It seems to be about the same return force as the others, so I'm happy.

Thanks again for the great photos!

Burnarr

 

Glad to help. That's why we're here (and to brag about our bikes!). It would be an awful lot harder to keep these bikes running without the internet and digital cameras.