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Makotosun

Rx125 tachometer. Missing shim.

  • s900t8v
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Rx125 tachometer. Missing shim. was created by s900t8v

Hey guys reassembling my rx125 engine and I notice the taxho drive gear (white nylon) is missing the shim that goes between the engine casing and drive gear. 

see parts diagram number 4 

I was surprised when I disassembled that there was no shim. 

i am wondering if this shim is for the black drive gears ? 

I’ve measured the end float and without gasket it’s 0.6mm. With gasket probably 1mm that seems like a lot. 

does anyone know the dimensions or should I pay 50 dollars for a new old stock washer lol (I know they’re 5.99 on partzilla + shipping to Australia. 

so I am presuming I need this shim. 

thoughts ? 

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1976 Yamaha AG175 cafe
1969 Yamaha L5T
1979 Yamaha Rx125

1954 Puch 175 Sv
1951 Puch 250TF
15 Jan 2025 05:46 #1

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Replied by Gr8uncleal on topic Rx125 tachometer. Missing shim.

This ebay.com listing has the dimensions shown within the text, should you wish to look for a generic one.

3pcs YAMAHA DT400 RD200 LS2 DT250 CS5 CT3 AT1 Dt125 TACHOMETER GEAR SHIMS OEM | eBay
The following user(s) Liked this Post: MarkT, Ht1kid, Pete-RT1
15 Jan 2025 06:25 #2

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Replied by Pete-RT1 on topic Rx125 tachometer. Missing shim.

I have a generic shim in one of my CT1s, I purchased a pack.
Dimensions are often given in parts lists, the AT1 parts list confirms the dimension of the eBay listing Alan shared.
If you can't find the parts list for your bike but know the part number, using CMSNL to find where a part is used is a good idea then pick a parts list from the Tech Library here for one of the bikes the part is used on and see if the dimensions are given.
I've probably made that sound convoluted, but it's not really.
Yamaha CT1 007
Yamaha CT1-B The Greenie
Yamaha CT1-B The Doppelgänger
Yamaha CT1-C
Yamaha AT1-C
Yamaha CT3
2020 Honda CB500X
The following user(s) Liked this Post: MarkT, Gr8uncleal, Ht1kid
15 Jan 2025 10:16 #3

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Replied by MarkT on topic Rx125 tachometer. Missing shim.

One, check carefully inside the cover for the shim.  "Stiction" often glues it to the cover.

Two, check solvent tank or area where cover was cleaned and stored...  floor around disassembly, etc. 

Three, this "shim" looks a lot like an errant flat washer!

Four, very commonly lost...  and it's often missing.  I have never seen any ill effects of this shim missing and there are likely hundreds and hundreds of bikes running around without it. 

 
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
The following user(s) Liked this Post: Ht1kid
15 Jan 2025 13:13 #4

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Replied by Gr8uncleal on topic Rx125 tachometer. Missing shim.

"Dimensions are often given in parts lists, the AT1 parts list confirms the dimension of the eBay listing Alan shared.
If you can't find the parts list for your bike but know the part number, using CMSNL to find where a part is used is a good idea then pick a parts list from the Tech Library here for one of the bikes the part is used on and see if the dimensions are given.
I've probably made that sound convoluted, but it's not really."

Good advice - I have used this method to check hose lengths.
16 Jan 2025 01:37 #5

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