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Messages - K2-K6

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3181
Misc / Open / Re: Registration service...
« on: March 06, 2019, 08:32:09 PM »
Could you put it through an mot with all data you have to get it on current system? Then apply for V5.

Normandy motorcycles for mot maybe.

3182
The Black Bomber Board / Re: 1969 CL450 US Barn Find Restoration
« on: March 06, 2019, 04:12:44 PM »
Assuming all else is up to scratch,  it's almost without exception that it's air leaking in (effectively unmeterred)  that gives uncontrolled tickover.

Think you're on the right track by eliminating the most likely culprit first.

The felt seals, can you soak them in engine oil while you are fitting the setup? It's usually enough to get a temporary stay of execution to assess it. Although done at the same time as the inlet tracts wouldn't give you defined cause to be satisfied with.

3183
CB750 / Re: TANK LINER REMOVAL
« on: March 06, 2019, 01:26:51 PM »
You'll see soon enough if the glue has any effect on the liner,  so at least it'll show if mek is any use.

We used both solvent and mek based glue on chemical pipework in factories.  As we had fairly hefty static loading from large header supply tanks, we'd routinely clean to prepare glued junctions etc by wiping with straight mek,  then apply the cement for final assembly to ensure long term joint integrity.  Some of the control valves were assembled using silicone lubrication on seals which if left present caused the joints to default.
Also straight mek used to dilute the cement if left open too long and went too sticky.

Acetone I think, will dissolve resin based materials prior to catalysed hardening, as for example brush cleaning in fibre glass workplaces. Once set though,  it's much harder to change its status.

The pipe cement will glue some of the bike plastics.  Just rub a test patch on the back of a cracked side panel to see if it's receptive to mek base.
You can also reinforce the back side with cotton scrim and resin or epoxy to support a cracked area. For cotton scrim you can use old well washed thin T-shirt material  :)

3184
CB750 / Re: TANK LINER REMOVAL
« on: March 04, 2019, 08:14:15 PM »
I wasn't going to ask, what sort of Catholic activities you were involved in to find that out  ;D ;D ;D

A friend was trying to syphon some coolant out of his engine to check anti-freeze concentration,  mis-judged it, and in a reflex action swallowed a load of it.
Went to a+e and they stomach pumped him. They couldn't stop laughing though as he is a policeman  :D

3185
CB750 / Re: TANK LINER REMOVAL
« on: March 04, 2019, 07:37:06 PM »
Just don't let it, or its vapour get on yer Ball's.
Or you will be in a World of Pain.
Believe me!

Aftershave or deep heat apparently are just as risky for that part of your anatomy.

Funny where these threads lead to isn't it ;D

3186
CB750 / Re: TANK LINER REMOVAL
« on: March 04, 2019, 03:47:47 PM »
Yes, as with any flamms,  I'd do that outside to reduce risk of inhalation and combustion problems  ;D

Another to try if that doesn't touch it, you can readily buy methanol from model rc nitro-motor suppliers.

3187
CB750 / Re: TANK LINER REMOVAL
« on: March 04, 2019, 12:47:39 PM »
Plumbing supplies for plastic pipe joint chemicals should get you a convenient supply of mek solvent to try and dissolve a sample.

3188
What is it? / Re: 750 Downpipe
« on: March 03, 2019, 09:19:27 PM »
As a cursory guess I'd say 750 F2 as a possibility,  and number one cylinder judging by the angle of top and bottom to each other.

Also possibly aftermarket as can't remember original's configuration. I've got some examples I can look at tomorrow to see if any matches.

3189
CB750 / Re: Sandcast for sale at 2WS
« on: March 03, 2019, 01:39:05 PM »
Some of the areas have much move significant winters than us,  so common to lay them up for chunk of the year. Think they have insurance policies based on that usage pattern as well,  ie .basic cover when stored and reverts to riding between certain dates.

A friend in Rhode Island worked for a bike dealership that also stored bikes for military personnel while away on service overseas,  they were all racked up in big barns to be readied on demand.  Season and miltary service constraints dictating.

3190
CB350/400 / Re: Boyer Bransden ignition system first report.
« on: March 03, 2019, 01:22:41 PM »
As far as I understand it, you just have to be in excess of the maximum advance point.

Higher revs than needed are not going to give you any error as it'll just stay at a fixed maximum.

So, if you set it at 4,500rpm, then run it up to 6,000 it shouldn't change at all as should have already peaked lower.  If that makes sense.

They are just setting a maximum absolute advance point to avoid going too far at redline. Anything underneath that is determined in their programmed strategy.

3191
Misc / Open / Re: My Avatar .....
« on: March 03, 2019, 01:10:56 PM »
It's surprising when you find out something like that,  what a coincidence.

How did you find the link between them?

3192
Other Bikes / Re: The Avenger
« on: March 02, 2019, 11:23:10 AM »
Yep, you've come to the wrong place for advice like this.

You'll have to buy it now  ;D

Another one will help with diagnosis of potential faults  :) so it really makes sense.

Some people loose far more from buying a new car and the consequential deprecation,  that's my current primary reasoning.  Are they any happier?

Old bikes just look so nice too.

3193
CB500/550 / Re: CB550K3 PD46 carb jet sizes - the eternal querstion
« on: March 02, 2019, 10:06:47 AM »
I'd echo Bryan and Mathewmosse,  in that if they've been blocked on those really small low speed jets,  it can take quite a while before you can get them back up to scratch.
Initially, as soon as you get them visibly clean and running,  then they accumilate more problems.

You can get some idea of which carb is problematic by warming the engine and one at a time screw the adjustment in and out.  If it's blocked you get no response from that cylinder.  so at least you can pinpoint where you need to work.

Also,  with them dismantled,  you can use one of those domestic steam cleaners with a nozzle for ovens etc to clean the tubes within the carb bodies. It's used in chemical analytical labs to clean all the glassware,  removes tarring, crystalline deposits etc and may help you get them fully operational.

3194
Project Board / Re: CB750F2 .... silk purse from a sows ear.
« on: February 28, 2019, 08:42:30 AM »
About the front mudguard,  the Honda type usually rust through in that sandwich area above the brace and around the rivets.  normally seen by rust bubbling through the top surface, by which time it's too late.

Maybe worth thinning the paint first and try getting it to run inside that joint with it upside down.

3195
Project Board / Re: Meet my new 550f2
« on: February 27, 2019, 05:15:09 PM »
Very tidy,  looks to be a nice job in bringing another one back into use.

Starts to feel better as you get toward the finish line I guess.

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