Author Topic: Bomber exhaust cams  (Read 291 times)

Offline royhall

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Bomber exhaust cams
« on: January 25, 2019, 03:00:57 PM »
Just sorting through and cleaning the Bomber engine parts and on inspection one of the exhaust cam lobes has some pitting. Got the best pictures I could manage. What's the best way forward with this as they are rocking horse, or is it okay to re-use? The problem is quite common on these as the oil flow to the exhaust cam is low. Or a long shot, has anyone got a spare exhaust cam in good condition for an early Black Bomber engine that they would be willing to sell.

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« Last Edit: January 25, 2019, 03:04:27 PM by royhall »
Current bikes:
TriBsa CCM 350 Twin
CB350F in Candy Bacchus Olive (still smoking on pot 4 Ggrrrrrr)
CB750F2 in Candy Apple Red
CB1300SA in Black
Triumph T100C
Suzuki GS1000HC (DHL morons ruined my tank)
CB450K0 Black Bomber (current project)

Offline Bryanj

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Re: Bomber exhaust cams
« Reply #1 on: January 25, 2019, 03:11:43 PM »
If you want to go racing possibly re profile, if its going to be a fair eeather queen(or king) like i am it will probably be OK. I seem to remember that the cams are NOT hardened as the followers are plated hard

Offline MrDavo

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Re: Bomber exhaust cams
« Reply #2 on: January 25, 2019, 03:16:27 PM »
If you can't find anything better (I saw a couple for sale from breakers on US eBay when I needed one) I have one that is perfect other than damage to the flange that holds the damper ring in place, see my CL450 restoration thread for details and photos.

It would be fine if you were prepared to risk the damper rubber escaping, I wasn't but it's your call.
1969 Honda CL450 'Scrambler'
1971 Honda CB750 K1 'General Export Type' (from South Africa)
1985 Porsche 911 3.2 Carrera Sport
2005 Harley XL1200R Sportster

Online Laverda120

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Re: Bomber exhaust cams
« Reply #3 on: January 25, 2019, 08:20:38 PM »
Newman Cams in Kent can repair that. Ask for Mike Newman. I think I paid £27/lobe for my CB250RSA cam last year.

Offline royhall

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Re: Bomber exhaust cams
« Reply #4 on: January 26, 2019, 10:48:08 AM »
Thanks for the help guys. I have sent an email to Newman Cams to see what can be done. At this point I may as well fix the problem correctly. Will let you know what they say and what the costs are. Cheers.
Current bikes:
TriBsa CCM 350 Twin
CB350F in Candy Bacchus Olive (still smoking on pot 4 Ggrrrrrr)
CB750F2 in Candy Apple Red
CB1300SA in Black
Triumph T100C
Suzuki GS1000HC (DHL morons ruined my tank)
CB450K0 Black Bomber (current project)

Offline royhall

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Re: Bomber exhaust cams
« Reply #5 on: February 19, 2019, 06:35:27 PM »
Newman Cams in Kent can repair that. Ask for Mike Newman. I think I paid £27/lobe for my CB250RSA cam last year.
How long did it take for Newman Cams to return your stuff. They have had mine for two weeks so probably a bit early yet. Don't want to start bugging them too soon. They quoted me about £50 to repair the one lobe as he said they are a bit awkward to do plus £12 for the follower. If you could find a new cam it would be way more dosh than that so happy all round.
« Last Edit: February 19, 2019, 06:38:00 PM by royhall »
Current bikes:
TriBsa CCM 350 Twin
CB350F in Candy Bacchus Olive (still smoking on pot 4 Ggrrrrrr)
CB750F2 in Candy Apple Red
CB1300SA in Black
Triumph T100C
Suzuki GS1000HC (DHL morons ruined my tank)
CB450K0 Black Bomber (current project)

Online Laverda120

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Re: Bomber exhaust cams
« Reply #6 on: February 19, 2019, 08:05:47 PM »
It took about 2 weeks Roy for both the cam and the followers. When the engine went 'bang' a few weeks later the cam suffered a scuff, I contacted Newmans again to tell them the sorry tale they asked me to send it back to them. To their credit they returned the repaired cam 2 days later and only charged me £20 for the work. Great service.

Offline royhall

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Re: Bomber exhaust cams
« Reply #7 on: February 19, 2019, 09:08:43 PM »
Cheers. Sounds like I may be hearing from them in the next week or so then.
Current bikes:
TriBsa CCM 350 Twin
CB350F in Candy Bacchus Olive (still smoking on pot 4 Ggrrrrrr)
CB750F2 in Candy Apple Red
CB1300SA in Black
Triumph T100C
Suzuki GS1000HC (DHL morons ruined my tank)
CB450K0 Black Bomber (current project)

Offline kettle738

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Re: Bomber exhaust cams
« Reply #8 on: February 21, 2019, 07:37:15 AM »

I have used Newman Cams several times; the first occasion was for a pair of 450K1 cams and followers back in the early eighties.....at the time, he told me the 450 cam was the hardest he had ever seen according to his Rockwell tester.

That said, they did a superb job and I have been back several times since then, they are one of those rare niche engineering companies that are so invaluable......I'm always grateful to see they are still open when I occasionally drive past.....your cams are in very good hands.

Mick.   

Offline royhall

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Re: Bomber exhaust cams
« Reply #9 on: March 14, 2019, 10:46:03 AM »
Well I'm at nearly 6 weeks waiting for Newman Cams. It is with a guy called Ken Newman that frankly isn't worth phoning any more. Last time he couldn't remember the job, then he found it in a bag on his desk piled high with paperwork. Then he couldn't find the letter I sent with it so I had to email it to him again. The company may be good but that Ken guy is totally useless, he is completely unorganised and swamped with work that should have been done ages ago. Not impressed with this outfit so far. May have to ask for the CEO tomorrow and get his arse kicked.

To be honest I forgot to ask for Mike Newman as advised so ended up with brother Ken.
Current bikes:
TriBsa CCM 350 Twin
CB350F in Candy Bacchus Olive (still smoking on pot 4 Ggrrrrrr)
CB750F2 in Candy Apple Red
CB1300SA in Black
Triumph T100C
Suzuki GS1000HC (DHL morons ruined my tank)
CB450K0 Black Bomber (current project)

Online Laverda120

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Re: Bomber exhaust cams
« Reply #10 on: March 14, 2019, 01:49:15 PM »
That's bad news Roy. I would give them another call and ask for Mike Newman. They have been excellent in all my dealings with them.
They may be swamped with work as they do a lot of racing cams and the new season is about to start. Still, that's no excuse for your parts to be stuck under a mountain of paperwork for six weeks!

Offline royhall

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Re: Bomber exhaust cams
« Reply #11 on: March 14, 2019, 02:39:20 PM »
That's bad news Roy. I would give them another call and ask for Mike Newman. They have been excellent in all my dealings with them.
They may be swamped with work as they do a lot of racing cams and the new season is about to start. Still, that's no excuse for your parts to be stuck under a mountain of paperwork for six weeks!
I shall try them again in the morning.
Current bikes:
TriBsa CCM 350 Twin
CB350F in Candy Bacchus Olive (still smoking on pot 4 Ggrrrrrr)
CB750F2 in Candy Apple Red
CB1300SA in Black
Triumph T100C
Suzuki GS1000HC (DHL morons ruined my tank)
CB450K0 Black Bomber (current project)