Author Topic: Cb250rs Rocker cover. Immovable Dowel. For Information.  (Read 960 times)

kevberlin

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Cb250rs Rocker cover. Immovable Dowel. For Information.
« on: December 22, 2023, 04:45:31 PM »
I’m no mechanic so my local bike man determined that the rattling noise on my bike wasn’t the cam chain ……… it was a badly worn cam follower. Worse was to follow as he was unable to remove the securing dowel without the possibility of causing fatal damage.
Luckily, I’d previous had dealings with an engineering company specialising in British bike restoration.
They looked at the problem, considered various options and have opted to use a process called spark erosion.
David Silver supplied the new dowel and this will, post Xmas, be offered up to determine the depth of the spark erosion process.
All new to me, but I’m hoping for success. This may be of interest to 250rs owners as it is appears to be a known issue.
1983 Honda CB250RS
2023 BMW G310GS

Itsme

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Re: Cb250rs Rocker cover. Immovable Dowel. For Information.
« Reply #1 on: December 23, 2023, 07:56:19 AM »
I can see why your man said the cam followers are badly worn!

Hope all goes well and you get a good result.

Ian

tevie54

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Re: Cb250rs Rocker cover. Immovable Dowel. For Information.
« Reply #2 on: December 23, 2023, 08:39:04 AM »
This is a well known problem and one I have done many times, I have a video on YouTube to show how to do it, basically you weld a nut onto the dowel and use a slide hammer to extract the dowels, it's a far simpler method than spark erosion and the method suggested in the manual rarely works, if you need any more info let me know.

kevberlin

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Re: Cb250rs Rocker cover. Immovable Dowel. For Information.
« Reply #3 on: December 23, 2023, 01:05:24 PM »
Thanks fellahs. The one cam follower is incredibly bad but I have sourced a new one.
The welded nut option was also considered, but the engineer chose the erosion tactic.
It should be sorted in the early part of January so I will update on success or failure. Fingers crossed
1983 Honda CB250RS
2023 BMW G310GS

kevberlin

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Re: Cb250rs Rocker cover. Immovable Dowel. For Information.
« Reply #4 on: January 05, 2024, 03:07:55 PM »
Picked up my rocker cover today with new dowels and cam followers fitted. A sigh of relief. Hoping the bike will be back and running next week.
1983 Honda CB250RS
2023 BMW G310GS

Itsme

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Re: Cb250rs Rocker cover. Immovable Dowel. For Information.
« Reply #5 on: January 05, 2024, 09:03:02 PM »
That's good news Kev. Hope it goes back together well.

Ian

CrazyFrog

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Re: Cb250rs Rocker cover. Immovable Dowel. For Information.
« Reply #6 on: January 07, 2024, 07:39:57 PM »
Great, look forward to hearing it's back on the road for spring!
2023 Royal Enfield Meteor 350
2021 Honda CB125F

Moto63

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Re: Cb250rs Rocker cover. Immovable Dowel. For Information.
« Reply #7 on: January 07, 2024, 08:21:05 PM »
Yes. Good news indeedy that everything seems to be going well Kev. Look forward to hearing of future progress reports 🤞👍
Cheers, Michael

kevberlin

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Re: Cb250rs Rocker cover. Immovable Dowel. For Information.
« Reply #8 on: January 11, 2024, 02:34:54 PM »
Thanks fellahs. Pleased to report I collected my Cb250rs today. It sounds completely different, with the dreaded top end rattle a thing of the past. Rode home in the grotty weather but with a smile on my face. Great little bike in my humble view. Cheers. 🏍?🏍?🏍?🤟🤟🤟
1983 Honda CB250RS
2023 BMW G310GS

Itsme

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Re: Cb250rs Rocker cover. Immovable Dowel. For Information.
« Reply #9 on: January 11, 2024, 04:38:05 PM »
Hey that is really good to hear Kev, time to dream of miles to come.

Even weather can't spoil a good ride, I'd rather be on my bike in the rain than in a car in the warm.

Ian

Moto63

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Re: Cb250rs Rocker cover. Immovable Dowel. For Information.
« Reply #10 on: January 11, 2024, 05:20:59 PM »
Yes great news Kev. Glad to hear all went swimmingly (rode home in the rain, swimmingly 🤦???🧥🚪🚕) 😁 👍
Cheers... name withheld to protect the speedo wearers of this world 🤦???

xbally

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Re: Cb250rs Rocker cover. Immovable Dowel. For Information.
« Reply #11 on: January 12, 2024, 04:07:37 PM »
Thanks for posting this up Kev. Glad you got it sorted.

You'll be interested to know the ignition switch you very kindly donated last year is still going strong. I did have to disturb it today though as I've been having problems with noisy speedo and tacho head drives. I changed the tacho for this reason today and have now worked out the clocks can be changed without removing the ignition switch.

Martin
HONDA CB250RSA HONDA ST70

kevberlin

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Re: Cb250rs Rocker cover. Immovable Dowel. For Information.
« Reply #12 on: January 13, 2024, 07:18:30 AM »
Thanks Martin.
I am pleased all is well at your end.
I’d love to pop over and have a look at your bikes once the warmer weather arrives.

Kev
1983 Honda CB250RS
2023 BMW G310GS

xbally

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Re: Cb250rs Rocker cover. Immovable Dowel. For Information.
« Reply #13 on: January 13, 2024, 09:39:01 AM »
Hi Kev,yes that would be great.Just let me know when you want to come.
HONDA CB250RSA HONDA ST70