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Discussion Starter · #1 · (Edited)
I have got this ‘71 CB250 K3 up and running after a few years dormant. Yesterday the speedo stopped working. I have stripped it all back and found that there is a ring that fits into two grooves on the drive gear and has two teeth which fit into the notches on the hub, but both teeth have worn out completely that it is no longer catching and rotating the gear.

I hope this makes sense. I have looked at CMS but not sure if what I am missing is listed. I have attached a pic of the ring and you can see how the two teeth have been worn away.

Not sure what to do. I may be able to weld metal onto the ring to build up where the teeth were? Any suggestions would be great!
 

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Discussion Starter · #4 ·
Okay, having done a bit more research I have found the broken ring part number 44806-286-010. CMS have it listed with this photo...

https://www.cmsnl.com/honda-cb250k3_model50719/gear-speedometer_44806286010/#.W_pLxqSnzYU

It has the ring along with the drive gear. This is the same number on the eBay listing. David Silvers has one in stock too.

But the exploded diagram also shows a washer, part number 44809-286-010, which appears discontinued everywhere. I do not have this washer and wonder whether there may have been some play which caused the teeth on the ring to get damaged? Does anyone have an idea where I could get the dimensions and thickness for this washer to find a replacement?

I’m reluctant to fit a new part without understanding how the old one got damaged. Thanks.
 

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Discussion Starter · #6 ·
i’ve gone through the manuals and the exploded diagrams and can see now that the spacing washers should be underneath the drive gear. I’ll strip the 250 and see if I have them.

I also see that there is a drive gear that has the two lugs/teeth as part of the gear, which seems common on the CB350 and CL350 K4. I have one of those too so may try and strip that wheel and see if that will fit as Silvers stocks those too...?
 

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Following up this thread in case it helps anyone in the future.

Disclaimer: I'm working on a CL350K4 and my comments are speaking explicitly to part number 44809-286-010, which has been referenced in this thread a few times.

The parts catalog I have indicates that there are two of them in the 350K4 and based on what I can find on the web, at this point, this particular part should be considered to be made of unobtanium. When I pulled the front brake panel apart on my CL350 mine were totally shredded, so I have no idea how many were actually in there. Were there two and they were worn down? Just one? No one will ever know.

Anyways, using a digital caliper I measured the part of the front brake panel the washer fits onto, and, to the best of ability, what was left of the remaining washer. Measurements seem to be approximately 35x45x0.5 (35mm ID, 45mm OD, 0.5mm width).

Lo and behold, McMaster-Carr makes a stainless steel shim ring that matches these specifications; their part number is 98089A368. At this time of this writing they are $10.46 + taxes/shipping for a pack of ten shims.

The cost was peanuts given how much I've put into my CL up to this point, so I rolled the dice and ordered a pack. They fit perfectly! See attached photos for more detail. Obviously, grease them heavily when installing (stainless vs. aluminum, rotating surface, blah blah blah).

Hope this helps someone!

44809-286-010_01.jpg 44809-286-010_02.jpg 44809-286-010_03.jpg 44809-286-010_04.jpg 44809-286-010_05.jpg 44809-286-010_06.jpg 44809-286-010_07.jpg 44809-286-010_08.jpg 44809-286-010_09.jpg
 
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