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cb400a
May 23, 2021 14:17:12 GMT
Post by terryc on May 23, 2021 14:17:12 GMT
Is this the one you're taking to Derbyshire Buster ?
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Post by buster on May 23, 2021 14:22:42 GMT
ok the honest test ride. it conked out my own fault (I think) I'm guessing valve clearances too tight, what a plank. I have a policy of test ride by going uphill (that way you freewheel home ) only problem is I just got over the second hill and down the other side before it died. bugger. oh well not to worry, it did highlight another small issue, the speedo wasnt working, so I'v put a new cable on and hopefully that will be ok now (old cable jammed solid). also on inspection the right hand cylinder was a touch lean so took the mixture screws back to factory settings and I'll work from there if they need it. it did look ok out and about, briefly just got to wait for the engine to properly cool...
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Post by buster on May 23, 2021 14:23:56 GMT
Is this the one you're taking to Derbyshire Buster ? it is if I can get it to run for more than a mile
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Post by terryc on May 23, 2021 14:28:13 GMT
For a man of your calibre ,no problem at all but no fording lakes & rivers in the road please
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cb400a
May 23, 2021 14:55:21 GMT
via mobile
Post by BritPete on May 23, 2021 14:55:21 GMT
So the important question how did the gearbox feel?
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Post by buster on May 23, 2021 15:47:30 GMT
So the important question how did the gearbox feel? gearbox feels ok, the pedals just not quite returning as it should from down shifts, I'll have another look at the spring on the gear shaft on that one, maybe its not quite sat right. a bit annoying as I paid really careful attention to that, I'm wondering if I'v nudged it while jiggling the clutch back together. should be easily sorted though
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Post by buster on May 23, 2021 15:48:56 GMT
For a man of your calibre ,no problem at all but no fording lakes & rivers in the road please hmmm, isnt derbyshire full of reservoirs? no I'll resist the temptation
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Post by CTB on May 23, 2021 18:05:23 GMT
Great work Buster
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cb400a
May 29, 2021 15:04:20 GMT
Post by buster on May 29, 2021 15:04:20 GMT
B*gg*r and thats meant with feeling (obviously not to the fine members on here). so test ride number 2, I'd done the valve clearances again (this time using cb400a settings rather than cb400t settings, Doh!), rode to the top of a different hill and same thing again, got about a mile and conked out then wouldnt start again. hmmm, its very like having a single cylinder with a badly worn bore (as soon as its hot it wont start) so sod it off with the top end. squishing the middle rings on the piston with my fingers they felt fine, however if I take them off and push the outer edge into the piston groove they feel very tight I suspect that this is the problem, scuppered by bloody pattern parts. so a new gasket set on the way (cheaper to buy a whole new set than individual gaskets) and two sets of genuine rings
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cb400a
May 29, 2021 19:49:15 GMT
via mobile
buster likes this
Post by johnjones on May 29, 2021 19:49:15 GMT
To save hair loss, get a pair of those red neon plug caps that flash when they pass HT, just in case.....
Make the needed adapters so the red caps fit inline on plugs and your oe plug caps.
A really usefully bit of kit, not expensive, a real world diagnostic aid...
I am sure you have test run engine before riding, so it reaches proper running temp and does not misbehave ?
Also on your next test ride, take a screwdriver as well to check for fuel flow and carb float bowls having fuel, via the drains...if it conks out...
How was the centralising spring on the gear change ?
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cb400a
May 29, 2021 20:10:02 GMT
CTB likes this
Post by buster on May 29, 2021 20:10:02 GMT
To save hair loss, get a pair of those red neon plug caps that flash when they pass HT, just in case..... Make the needed adapters so the red caps fit inline on plugs and your oe plug caps. A really usefully bit of kit, not expensive, a real world diagnostic aid... I am sure you have test run engine before riding, so it reaches proper running temp and does not misbehave ? Also on your next test ride, take a screwdriver as well to check for fuel flow and carb float bowls having fuel, via the drains...if it conks out... How was the centralising spring on the gear change ? sadly the hair loss is already happening but I dont think thats owt to do with the bike I wont rule out carbs completely (theyre very similar to 250 spec which can be a bit notorious) but the test ride was 1 mile of uphill twisty back road so if it was starving for fuel I'd guess it would show up sooner? the plug caps sound like a good idea, I'm a bit more old school, I put an old plug (that I know works) in my pocket and test with that. its a little odd in the fact that when you run it up under no load it seems to behave fine, starts easily, compressions good, no nasty noises or smoke. not got as far as the gear spring yet, I'll probably have a look at that one tomorrow thanks for the input
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cb400a
May 30, 2021 6:59:25 GMT
via mobile
Post by johnjones on May 30, 2021 6:59:25 GMT
I too am old school and solar powered...
Remember files, the cam cover is insulated by the rubbers...
As I B t of testing kit, I welded 2 working plugs to a bit of scrap strip and connected a fly earth lead with a crock clip, so 2 plugs and a good earth, no chance of damage to the ignition system.
The beauty of the neons is they are used with the engine running, and can be seen on a test ride, but the darker the better.
They can give an indication as to get strength, a rather feable flash at cranking, grow brighter at idle, and grow really bright with revs...rate of change.
When a misfire happens it can be seen due to a lack of flashing...
Saves hair loss and dizzyness when the problem feels like a fuel issue, but isn't....
The neons are my "go to" bit of kit as well as a strobe for ign advance, for misfires and conking out, rule ign problem in or out first, because of the fantastic reliability of this CDI system....which work really well, untill they don't ! 🤩
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cb400a
May 30, 2021 9:04:41 GMT
Post by buster on May 30, 2021 9:04:41 GMT
your quite likely onto something here john, I'm now thinking the ignition is not advancing as I'd like it to. I'll still switch to genuine piston rings as it should rule out any issue there. theres a specific interruption in the ignition circuit that stops the ignition advance (lowering revs from what I can glean) to allow the automatic to go from neutral into gear (presumably without the bike trying to jump forward) so my thoughts are disconnect 'that' wire (its never that easy though is it?) and see what happens (one nicely toasted cdi coming up )
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cb400a
May 30, 2021 10:55:40 GMT
Post by buster on May 30, 2021 10:55:40 GMT
time to do something oily instead the difference between not working and working
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Post by terryc on May 30, 2021 11:37:58 GMT
Took me a while to spot the difference I was beginning to think you'd posted the same pic twice
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