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Messages - Terrotmt1

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31
Japanese Bikes / Re: Honda cb175k6, 1972 re-build
« on: October 29, 2020, 05:12:16 PM »
Think I've got it today.
Stripped the carbs for the 8th time, cleaned and cleaned again, poked all the holes etc and re-assembled.

It started just like that, instant on the electric starter and I warmed it up.
Had the usual hot side/cold side and it almost switch over sides during some tweaking, BUT I seem to have found a sweet spot.

The tick over is close to a Harley though the tacho says 1800 sounds more like 3 rpm to me.
The pilot screw seems close to redundant but has with some combination of throttle slide adjustment seem to have bought the engine to balance, the silencer temps are really close.

Boyed by that, the next step is to fit the air filters and see if things are all ok after and re-tweak. These little bike can be sensitive I've read to the choking effect of the cleaners, but I hope my custom foam ones will win through.

Number plate arrives tomorrow, seat on and IT IS FINISHED.  :o

(As if...)

32
Japanese Bikes / Re: Honda cb175k6, 1972 re-build
« on: October 28, 2020, 10:27:32 PM »
Ha!
I've got some advice on the task in the USA, great forum for Honda Twins.
I cracked the same issue 5 years back and it was in those threads 5 years ago which a moderator had found for me to read.

Keep my mind off a dentist visit tomorrow reading that lot, but it will be fixed soon.

Best bit is the electric starter, no endless kick starting action. My knee still hasn't recovered from the French Follie.

Anyway, good to see your advice has not changed over the years! :)

33
Japanese Bikes / Re: Honda cb175k6, 1972 re-build
« on: October 28, 2020, 08:33:22 PM »
Thank you, yes, time to backtrack over everything.

34
Japanese Bikes / Re: Honda cb175k6, 1972 re-build
« on: October 28, 2020, 07:13:57 PM »
Yes, 'don't trust a thing'!

Going to check everything tomorrow, timing etc while it is all cold. My previous gold cb had this very same issue 5 years back, dammed if I can remember what someone in the USA told me to do but it simply worked...I'm too old for this game!

35
Japanese Bikes / Re: Honda cb175k6, 1972 re-build
« on: October 28, 2020, 04:25:51 PM »
It's getting irritating.
Fresh float gaskets, 21mm float heights, still a dribble every now and then from the overflows.
Brand new coil.

Got it started ok, very hard to get a reliable tick-over, according to the tach best I can get is 1900 or so before it stops.
Air screws do noting, so presume the tacho is reading accurately enough.

Thr rh side that was running cold now runs hot and the left is now luke warm, about 32 deg C, the temperature difference is just touchable at the exhaust tip on the rh side, easy/cold touch on the lh side.
This is exactly how my gold cb was, the hot/cold sides would alternate not during a run on the bench, but between cold starts sometimes.
Bowls are full due to occasional weeping from the overflows.

So, just how do I get these to balance? Any ideas please?

36
Japanese Bikes / Re: Honda cb175k6, 1972 re-build
« on: October 22, 2020, 06:54:47 PM »
I've had far more adventures with 2 strokes and 4 than I care to remember.
Strikes me the more complicated the engine the better chance I have of success. ::) over all the years I've spent tinkering I've enough knowledge to be dangerous.
I can almost 'feel' mini's disappointment! :)

These small Hondas are sensitive to the resistance of the air filters, so tuning needs to be done with them on etc.

My gold cb had some carb issues that took a long time to sort to get the balance right between the carbs, but this is a great design of bike in my limited experience.

37
Japanese Bikes / Re: Honda cb175k6, 1972 re-build
« on: October 22, 2020, 05:22:55 PM »
Whoe! Miles off: :)

One carb leaks from the bottom bowl gasket, so need to replace the rubber seal that has been compressed for 48 years...

Will do both carbs, kit on order.

However, it runs. Lovely Honda Twin rumble, vibrations everywhere (they are all like that).

Some tuning to do tomorrow, but a great kick-off to the last match.

Could this be the quickest re-build on here?

So there Mini, nothing for you to read!  :P   ;D

38
Japanese Bikes / Re: Honda cb175k6, 1972 re-build
« on: October 21, 2020, 10:57:35 PM »
Couldn't resist trying a quick start up.
Rigged the fuel supply up and filled the bowls. Checked for a spark on both plugs, present and correct, but could be fatter.

Pressed the starter button.
Nothing, but did not try very hard or for very long.
One carb bowl leaking slightly so that needs sorting tomorrow, other side OK.

Had a lot of trouble with the gold cb, so here we go again...me and carbs and sparks do not mix well.

39
Japanese Bikes / Re: Honda cb175k6, 1972 re-build
« on: October 19, 2020, 08:14:10 PM »
Thanks for your concern!
The table is on wheels and the garage is 2 car wide, but it will be run on the table outside on the drive which will have all car there elsewhere.
Keeping it on the table out of convenience to get eye level to th engine timing and carbs.
I did the gold bike on its wheels, and you have made me think again.

40
Japanese Bikes / Re: Honda cb175k6, 1972 re-build
« on: October 19, 2020, 05:54:01 PM »
Things getting serious...

All the electrics are up and running after a few 'earthing' issues and a few mysteries, but all works.

Time for petrol and sparks once I get the engine oil into the bike, but the electric starter works a treat.

Now, just what can possibly go wrong as the phrase goes...


41
Japanese Bikes / Re: Honda cb175k6, 1972 re-build
« on: October 13, 2020, 04:35:52 PM »
Only Mini can put a smile on my face after another 3 hours on this bike's wires!

Looks like the starter solenoid is cream-cracker'd, so to the flasher relay, but got the neutral position circuit done and a few other circuits.

Slowly, slowly catch the monkey. The Gold bike was the same.

42
Japanese Bikes / Re: Honda cb175k6, 1972 re-build
« on: October 12, 2020, 07:01:42 PM »
Yes, the curse of any car or bike forum!
I'm sorry!!
Wet clutches and modern formulae in oils made me wonder....

43
Japanese Bikes / Re: Honda cb175k6, 1972 re-build
« on: October 12, 2020, 04:58:49 PM »
On the subject of oil:

The Haynes manual stated 'Castrol GTX' oil, with no further info.

For this little CB what modern oil would be best suited?

44
Japanese Bikes / Re: Honda cb175k6, 1972 re-build
« on: October 07, 2020, 05:29:41 PM »
 few more hours in the garage on the bike progressed things a little.
I think after this post I'll slow reports down until a major milestone is reached.

Missing on the bike was the second pair of exhaust sleeve halves, and as these are also hyper rare (at a reasonable price) I made some from metals I had around me.

That job done the front wheel went in and after a few tries finally sorted the tls lever travel out so I have max leverage at just before contact of the shoes.
Other parts should arrive tomorrow to finish off the mech parts of this rebuild tomorrow, then it has to be the electrics...

The proportions of these little Honda twins is just so right.


45
Japanese Bikes / Re: Honda cb175k6, 1972 re-build
« on: October 06, 2020, 02:06:32 PM »
New tyres are always nice on anything, you can have new poor tyres, and older great tyres...
Not sure what tyres are best, possibly not the most expensive.

They came from a reputable supplier who did the new rims, spokes and tubes.

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