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Messages - Bristolbadger

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CB750 / 750 roundtop carb exploded!
« on: July 17, 2022, 02:28:52 PM »
... No not literally but this image has helped me out a bunch of times. Hope you find it as much help too :)

As you were

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CB750 / Re: Intake boots for roundtop carbs
« on: June 08, 2022, 07:53:44 AM »
If you PM Nurse Julie she will have some good secondhand ones that have been softened  ;)
Will do, thanks Trigger!

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CB750 / Re: Help! What's caused this?
« on: June 07, 2022, 08:35:25 PM »
Alright guys,  can anyone be of any help with this please, otherwise thinking of shrinkwrapping the split ones

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CB750 / Intake boots for roundtop carbs
« on: June 07, 2022, 06:07:01 PM »
Evening all, I've just got back from a ride and though I'm due to balance my carbs was thinking how out they've suddenly become... so after a brew and closer inspection I've got a split intake boot on no.4 and possibly 3.

Anyone got a set or recommend any sensibly priced ones please? I might as well replace them all as a set.

Cheers guys

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CB750 / Re: Help! What's caused this?
« on: May 17, 2022, 07:05:25 PM »
And the last two times he came  he brought no biccies!!!

Bloody liberty!

We had a good hoot tbh, shame to see you go bud apart from the space. Any fellow tea drinker, biscuit munching blue’s lover is always welcome. After I get back from the states we’ll have to go for a scootch and then get down the river for a bit of maggot drowning……

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Chomp...chomp...chomp!! I'm sure TJW would approve of the beers as the biccy sub lol

Yeah mate well up for some fish pestering and a ride or two. Have fun in the States, I'm well jel

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CB750 / Re: Help! What's caused this?
« on: May 17, 2022, 05:55:08 PM »
Well done, onwards and upwards.
Well, usually sideways (but upright)

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CB750 / Re: Help! What's caused this?
« on: May 17, 2022, 05:53:20 PM »
Nice work to get going again.

The oil is not that much (in quantity terms) demanded around the camshaft. Most importantly is always to be there, present and reliable to keep it from damaging itself.

It's why they will run for a few miles after rebuilding originally that the assembly oil is sufficient until it goes dry that shows this. So as long as the supply is constant it won't show much in the way of total amount flying around in there.

They control the feed volume with those two restrictions and the leak down back to sump by the little pools created by casting to dip the cam lobes into, along with the drain holes going back down through the head.

Just keep checking the oil is there for each run initially to give you confidence that it's always there and that should be ok at that.
Yeah it's a nice feeling to have her running again. Largely thanks to Roy for parts and Laverdaroo for the space and letting me doss in his workshop to get her fixed up! Ace guys

Nice one for that info, I understand it better now. So long as the little cam tower pools are filled and it's all nice and oily we should be good eh. I'm obviously a bit para now so will be whipping those caps off regularly too

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CB750 / Re: Help! What's caused this?
« on: May 17, 2022, 11:16:12 AM »
Hi folks, so after a few minor hiccups during the strip, clean and rebuild I've managed to get the old girl back together.

Not the quietest engine around and need to reset the tensioner and recheck the valve clearances but she is what she is, a grumbling 48yr old lol.

So, lessons learnt ... I'm going to dump the oil and refill after a bit more running and a gentle mile or so. I first span her over with plugs out and got the oil pump doing its job after a moment or two and heard oil squelching up into the head, then fired her up and took the cover caps off expecting to see a lot of oil flinging around.
Whilst there is some (more of a fine mist) and everything looks wet and nice fresh oil coated, I just wondered if I should be seeing more going on up there?

Here's a vid - soz about the dodgy camerawork I had a torch in one hand, phone in the other and a beer that needed drinking on the ground

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CB750 / Re: Round top carburetor
« on: April 29, 2022, 01:55:17 PM »
I had the same problem and fitting a new throttle return spring on the carbs sorted it beautifully, then I could adjust them and get the idle ticking sweetly.

It's nice when the cheapest and easiest first thing to try sorts it, maybe worth a go

CB750 / Re: Help! What's caused this?
« on: April 29, 2022, 01:48:58 PM »
And there I was, thinking I'll not fall foul of the damn lifter plate tightening this time... only to hear the sickening 'tick' as it snapped. Might have to bite the bullet and go for one of those Trigger  ::)

CB750 / Re: Help! What's caused this?
« on: April 29, 2022, 09:05:33 AM »
Hi folks, hope everyone's well and good!

So my run of good luck continues... this time the bastard, made-of-toffee, clutch lifter plate! Yep I broke it last night after being careful and taking my time to make sure it all was aligned... got to the final bolt torqueing (8ft lbs prob too much in hind sight) and snapped the plate.  :(

So.... anyone have a spare they could part with please?


CB750 / Re: Help! What's caused this?
« on: April 06, 2022, 10:05:44 PM »
Thanks Trigger, dry it is then for the HG.

I've been busy cleaning up the head and blowing out all the oil routes and opened up the cases for a pressure rinse of white spirit and further manual cleaning!!! ... inbetween a job interview and work/fam commits...

Is it possible to flush an oil pump sufficiently without dismantling?

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CB750 / Re: Help! What's caused this?
« on: April 05, 2022, 08:52:50 AM »
Bristol Badgers is a K3 Trigg

Will be OK for early K3  ;)

Good stuff, I wouldn't have had a prob taking it back to the guy if it wasn't a fit, just a shame I can't afford the MLS type HG same as I had on before.. it got de-lammed when I took the head off.

So what's the crack with these type, smear with oil, spray with copper coat or just put it on as dry as a Jackob's cracker?

I've now got the cases opened up and ready for some forensic cleaning... I've cut a 50gal plastic drum in half and plan to give her internals a spray rinse with something first.... but what? Diesel, Gunk, paraffin???? then to spray every orifice and oil gallery with parts cleaner before reassembly.

Info appreciated :)

CB750 / Re: Help! What's caused this?
« on: April 04, 2022, 02:38:13 PM »
Hi folks, so I'm making some progress on the repairs and have a few questions...

I've got a head gasket but it's not the graphite type like the previous one I used... it was from a closing down, old school bike shop/engineers and seems like it's more fiberous (composite?) and than the previous NE one that came in a set for the whole bike.

So how to proceed with it when I'm back at that stage... oil it, use copper spray seal or what?

Also another pertinent question that could be a contributing factor to my problem; I'm running a custom oil tank with the original hose unions at the engine end but connected with ID: 14.3mm hose. Do you think this will adversely affect the flow/pressure? Anyone know the original hose ID?

Cheers fer now

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