Author Topic: Drive sprocket rubbing and DSS coils  (Read 247 times)

Offline jeremypeachey

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Drive sprocket rubbing and DSS coils
« on: February 09, 2020, 03:13:09 PM »
Hi all, very grateful for any thoughts:

I'm replacing the 3 seals in the drive casing area, and noticed the chain is rubbing on the clutch push rod seal and it's surrounding alloy.
The drive sprocket slides a bit on it's shaft, and the 'play' is 1mm.
I have measured carefully and a steel washer/shim 1mm thick and internal diameter 25mm and about 30mm external diameter should stop or reduce the rubbing. The washer will not be subject to anything spinning on it as it remains relatively fixed on the shaft.
Should the sprocket slide in and out like this and should I just leave it? I suspect this is a common problem?

Also while I'm on, I bought a pair of coils on Ebay whose mountings are too close together so I'm returning them.
Has anyone used DSS coils, do the mounting holes match the original, and is the fitting of the 'substitute' wires fairly obvious as the differ to the original?
I will of course ask DSS the same question when I order.

As always, grateful for any comments from past experiences.
Best wishes.
Jeremy P

Offline Nurse Julie

  • 1973 CB750 UK K2.1977 CB550/4 Mongrel Brat. 1978 CB400/4.
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Re: Drive sprocket rubbing and DSS coils
« Reply #1 on: February 09, 2020, 03:20:51 PM »
Have you got a standard drive chain fitted or an X ring or O ring chain?
Im a Nurse, trust me, this won't hurt.....much !!!

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Offline Johnwebley

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Re: Drive sprocket rubbing and DSS coils
« Reply #2 on: February 09, 2020, 03:27:21 PM »


  I bought a few DSS coils,

  but I think Boyer ignition burned them out,

 so I bought a pair of Boyer coils,fitted perfectly ,and no trouble
lifelong motorcycle rider,and fan

Offline jeremypeachey

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Re: Drive sprocket rubbing and DSS coils
« Reply #3 on: February 09, 2020, 03:56:41 PM »
Thanks both.
Julie, I just measured the chain and it looks pretty wide at 25mm. The link plates have a gap between which I guess may be the seals or washers.
It looks fatter than my chain back in the day, which I used to put in a wax/oil bath on the cooker. I'm only doing very low mileage.
If the standard chain (DSS one looks better and is only £19) is narrower, I guess the sideways play of the sprocket could be viewed as normal and/or would not matter. In general parts don't look unduly worn.
Jeremy P

Offline Nurse Julie

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Drive sprocket rubbing and DSS coils
« Reply #4 on: February 09, 2020, 04:26:08 PM »
Thanks both.
Julie, I just measured the chain and it looks pretty wide at 25mm. The link plates have a gap between which I guess may be the seals or washers.
It looks fatter than my chain back in the day, which I used to put in a wax/oil bath on the cooker. I'm only doing very low mileage.
If the standard chain (DSS one looks better and is only £19) is narrower, I guess the sideways play of the sprocket could be viewed as normal and/or would not matter. In general parts don't look unduly worn.
yes, 25mm sounds too wide, you must have one of these modern day fandangled x ring / O ring chains fitted. There is only just enough room for a standard width chain to run without fouling.
« Last Edit: February 10, 2020, 07:13:27 AM by SteveD CB500K0 »
Im a Nurse, trust me, this won't hurt.....much !!!

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
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Offline jeremypeachey

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Re: Drive sprocket rubbing and DSS coils
« Reply #5 on: February 09, 2020, 05:18:01 PM »
Brill, thanks Julie.
I noticed when looking at the leaking seals, and it seems the drive shaft deal is an engine case split job, ditto the clutch rod one, but the worst culprit seems the gear shift shaft seal. Does that sound familiar?
Regards J
Jeremy P

Offline Bryanj

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Re: Drive sprocket rubbing and DSS coils
« Reply #6 on: February 09, 2020, 05:53:11 PM »
You can change all of them without splitting the cases but not the crank seals, having said that it is easier with cases apart

Offline jon stead

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Re: Drive sprocket rubbing and DSS coils
« Reply #7 on: February 21, 2020, 05:28:47 PM »
Thanks both.
Julie, I just measured the chain and it looks pretty wide at 25mm. The link plates have a gap between which I guess may be the seals or washers.
It looks fatter than my chain back in the day, which I used to put in a wax/oil bath on the cooker. I'm only doing very low mileage.
If the standard chain (DSS one looks better and is only £19) is narrower, I guess the sideways play of the sprocket could be viewed as normal and/or would not matter. In general parts don't look unduly worn.

I know your question is different to this, but I had an issue with my chain colliding with the clutch crank arm. I’ve posted the link to the thread about chain widths

http://www.sohc.co.uk/index.php/topic,16301.msg137109.html#msg137109

1973 CB 500 K2, 1998 Yamaha XJ900 Diversion, 2015 Triumph Bonneville T100 Newchurch

 

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