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Messages - tom400f
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677
« on: October 23, 2012, 09:21:13 PM »
John
I (and I'll wager I speak for others) think your posts are great. Your enthusiasm shines through... I don't know if you've worked on these bikes much in the past but I'm no expert myself and we all have to start somewhere.
When I was 18 I bought a 400/4 unseen (well my brother had seen it at the dealers). It was only three years old but already had koni shocks (may be an improvement measure?), non-standard handlebar grips, the kickstart sometimes didn't engage, the clutch snagged and (as I discovered) the cam chain tensioner bolt was snapped off.
To pick up the bike I trained it to a then dingy Liverpool St station with the CB175 I was trading in lashed in the guards van (that was for free as well). Found my way to Acton and then rode the 400 back to Norfolk. Once I found out about the cam bolt I remonstrated with the dealer - to no avail of course. I then succeeded in snapping an easy-out in there. I reckoned I'd sell it and get a Suzuki GT380. As good as those bikes probably are that was a case of "shame on me". I missed a call to my advert and then thought sod it - I'll strip the bugger down.
Over the Christmas holidays I took it apart on an old kitchen table in the garage, took the crankcase back to university and to an engineering shop my dad used (in fact A L Carter Engineering Rear of 7 Chiswick High Road is still listed on 192 etc) and it cost me 40 quid (king's ransom to a student then) but the job was good. A large plug tapped in there and then drilled to the original bolt size.
Back home on the train, put the engine back together over a weekend and then ride it back to London. Don't know if kids/students would do that kind of thing these days.... anyway the kickstart was fixed, the clutch action was smooth and it rode great. That was until it was nicked two years later - NGH276P is hot by the way.
But I digress. Layla will rise and ride again. Your top-end strip is a good idea. I'd suggest grinding the valves in and fitting new guide oil seals while its out. Clean up the ports a bit... your new rings may be... getting the barrels back on is a piece of p1ss. Sort your carbs (you got them from bitsa? I'm sure he wouldn't flog you rubbish but nonetheless they may need a proper ultrasonic clean out - ok I'm at the limit of my knowledge when it comes to carbs) and we await your piglet-stylee videos.
In the mean time keep up the good work and do please continue to post your travails.
678
« on: October 23, 2012, 11:19:13 AM »
that if a ring itself is worn then it won't be as wide as a new one and its end gap when inserted into a bore will be larger
Why? The ring does not wear on the ends surely? Surly how worn the bore is determines the end gap. Larger end gap = more wear on the bore.
No it wears on the edges, gets narrower and has to expand more to reach the bore. (btw I wasn't trying to suggest it gets "shorter") As Oddjob says, your measurements at the moment will combine ring and bore wear, until you get a new ring set. Hence I was suggesting eliminating one of those and then the other... just to see a bit more how things are.
679
« on: October 23, 2012, 10:39:50 AM »
Thinking is good. I am only thinking that if a ring itself is worn then it won't be as wide as a new one and its end gap when inserted into a bore will be larger. I would also imagine a narrower ring would be less "springy". (Note I am choosing my words carefully - I'm not talking about the ring clearance in the piston groove - then I would talk about a ring being "thinner" - just saying).
Since ring wear has been cited (if your bike ran lean for any length of time) then its worth measuring, at least comparatively for now across the sets you have. Likewise the bores - if they are all similar then chances are your barrels are good.
When you get a new ring set you will have absolute measurements and you will know whether you need more.
680
« on: October 23, 2012, 09:29:58 AM »
Yes you are making sense.
Without a way to measure the bores independently (micrometer instead of using a new ring) I suppose you cannot tell. However as Oddjob suggests, one new ring set is unlikely to go to waste but while you are waiting you could:
1) choose one bore and measure all ring sets against it (bore is constant) so you get some idea of how the rings compare
2) use the "best" set of rings to measure all your bores (ring set is constant)
Then you have some comparable numbers for both.
681
« on: October 22, 2012, 10:20:00 AM »
682
« on: October 21, 2012, 10:19:01 PM »
So if painting, what methods of application do people use?
Put another way, can you get a decent finish with a brush or do some of you have an air line etc?
684
« on: October 20, 2012, 06:17:05 PM »
I've just done mine on a 400F. You fit the secondary cup over the piston - just mind not to bend the snowflake things. Here's a picture, old/new. Ignore the order I've laid them out in but you can see the secondary cup on the old one. Pukka manual for your bike here: http://www.dotheton.com/downloads/CB500-550_Manual.pdf
685
« on: October 19, 2012, 03:43:18 PM »
686
« on: October 17, 2012, 10:13:57 PM »
This is a great technique. Filled my front brake from empty this way. In this case if you draw back on the syringe as you go then lots of air comes out of the caliper. Once there is a reasonable amount in the reservoir I worked the lever gently and remaining air in the master cylinder bubbles up. When that's all gone pumping the lever (gently) pushes the syringe back out and you can move the fluid to and fro until there are no more bubbles to be seen. If the system is already full then bleed this way too.
Simple, quick, economical on fluid and very little mess.
687
« on: October 16, 2012, 10:09:25 AM »
I used the tank repair kit from Frosts - write-up is here: http://www.sohc.co.uk/index.php/topic,4758.0.htmlIf your tank only needs cleaning then you can buy the Marine Clean separately. Their website includes the datasheet for it which tells you its composition, so may be you can compare this with the labels on Halfords products...
690
« on: October 14, 2012, 08:05:32 PM »
Just for a laugh - here are a couple of pages from the Honda service booklet (This is from my 400F January 1978 but the booklet looks to be used across all models at the time).
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