Yesterdays "find".
Winter tyres not included
Showing posts with label CB125. Show all posts
Showing posts with label CB125. Show all posts
2012-04-11
More Junk
Maybe I should start to build something instead of just piling junk.
Yesterdays "find".
Winter tyres not included
Yesterdays "find".
Winter tyres not included
2012-01-15
D.I.D it!
One time only...
The cold weather only had one positive aspect, the rims did not get hot to handle.
On the other hand this probably affected the function of the polishing compund in a negative way. I'll have to do it all ove again with a finer coumpound later.
Anyway, I made some short cuts by not grinding with fine grit paper, that shows. But on the other hand they are old rims, full of nicks and dents. You have to draw the line somewhere...
The cold weather only had one positive aspect, the rims did not get hot to handle.
On the other hand this probably affected the function of the polishing compund in a negative way. I'll have to do it all ove again with a finer coumpound later.
Anyway, I made some short cuts by not grinding with fine grit paper, that shows. But on the other hand they are old rims, full of nicks and dents. You have to draw the line somewhere...
2012-01-14
Doldrums
Due to my lack of stamina and cramps in my grindig hand I have limited the visits in the shed to one hour a day. My thumb is numb...
This is one of the resons why the rims aren't ready yet. The factor that I'll have to do the last polishing outdoors might slow things down too, it's -5 degres Celsius at the moment, it's dark and the wind is over 10m/s. Maybe tomorrow.
This is one of the resons why the rims aren't ready yet. The factor that I'll have to do the last polishing outdoors might slow things down too, it's -5 degres Celsius at the moment, it's dark and the wind is over 10m/s. Maybe tomorrow.
2011-12-26
New Rods
Because of the storm last night and the following power failure, there has not been much action in the shed today.
At least the car still had some power so I went and bought new connecting rods for one engine.
At least the car still had some power so I went and bought new connecting rods for one engine.
2011-12-25
Rims
Today I started all over again, the crack in the rim was not welded through so it had to be re-done.
At the same time I had all the largest nicks filled in.
The front rim also welded but not grinded.
There where two large holes for rim locks that I did not want.
Below, welded and grinded using small file and sand paper. One small spot in the weld...
Hopefully the rims will turn out as good as the Borrani rim that I polished several years ago. Still have not had any use for the wheel.
And if I dont find anything else to do, there are more rims waiting
At the same time I had all the largest nicks filled in.
The front rim also welded but not grinded.
There where two large holes for rim locks that I did not want.
Below, welded and grinded using small file and sand paper. One small spot in the weld...
Hopefully the rims will turn out as good as the Borrani rim that I polished several years ago. Still have not had any use for the wheel.
And if I dont find anything else to do, there are more rims waiting
2011-12-17
2011-12-11
Electrix
Searched the shed for a CB125 alternator, the first rotor I found looked like this.
What might have happended to that? It also looks like someone have been riding the bike for some time after that happened. Maybe it's the cause of this or the result?
Finally found a good one but the configuration of the stator did not match my Worshop Manual. Later found the matching wiring diagram in a CB125B6 manual. Anyway it's a 6V alternator and a flash light probably would be better.
If the magnets are good, I think I'll try to modify it and see if I could get more power.
What might have happended to that? It also looks like someone have been riding the bike for some time after that happened. Maybe it's the cause of this or the result?
Finally found a good one but the configuration of the stator did not match my Worshop Manual. Later found the matching wiring diagram in a CB125B6 manual. Anyway it's a 6V alternator and a flash light probably would be better.
If the magnets are good, I think I'll try to modify it and see if I could get more power.
2011-12-10
Nothing much
Mostly grinding and some latheing. Started with the CB125 brake shield, had to add some JB weld (metal glue) in the imperfections from the welding. Hopefully I can finish that tomorrow.
Also I have had a CB500T oil filter part laying in the shop, for a wery long time. Thougt the condition was so bad that I just could not lathe it down, as I usually do...
Made a new bronze bushing. Had it been a CB450 part it most centainly had gone in the trash bin, since I have got several NOS ones ...
After that I thought I could spend some elbow grease on the modified CL77 lower legs that eventually will go on the CR450 project that has been resting for some years.
The lower fork legs has been modified with new fender mounts and new brake mount for a 4ls drum brake. This is what they looked like after welding.
I also made new bushings for the CB125 rear swing. The oringinal ones were so rusted that I had major trouble dismanling the damn thing. Had to soak it in oil for a couple of weeks.
Also I have had a CB500T oil filter part laying in the shop, for a wery long time. Thougt the condition was so bad that I just could not lathe it down, as I usually do...
Made a new bronze bushing. Had it been a CB450 part it most centainly had gone in the trash bin, since I have got several NOS ones ...
After that I thought I could spend some elbow grease on the modified CL77 lower legs that eventually will go on the CR450 project that has been resting for some years.
The lower fork legs has been modified with new fender mounts and new brake mount for a 4ls drum brake. This is what they looked like after welding.
I also made new bushings for the CB125 rear swing. The oringinal ones were so rusted that I had major trouble dismanling the damn thing. Had to soak it in oil for a couple of weeks.
2011-10-29
Got some parts welded, finally.
Among the welded parts was the modified front fork tubes for the Fleetwood.
(one of the old bleeders was broken so I replaced both of them.
For the CB125 the brake cable grommet on the front brake shield was broken so I decided to also modify/remove the whole speedo drive. The cast aluminium in the brake shield is not easy to weld so I will most likely have to paint it.
In the rim, that will go on the front drum brake, there was a crack that had to be welded. Maybe I should have filled in all the small dents/nicks to? The reason why I had this rim repaired, in the first place, is that it's an original DID valanced aluminium rim. The rim is also stamped YDS2M, which is a Yamaha?
The 'only' thing left is a lot of grinding...
(one of the old bleeders was broken so I replaced both of them.
For the CB125 the brake cable grommet on the front brake shield was broken so I decided to also modify/remove the whole speedo drive. The cast aluminium in the brake shield is not easy to weld so I will most likely have to paint it.
In the rim, that will go on the front drum brake, there was a crack that had to be welded. Maybe I should have filled in all the small dents/nicks to? The reason why I had this rim repaired, in the first place, is that it's an original DID valanced aluminium rim. The rim is also stamped YDS2M, which is a Yamaha?
The 'only' thing left is a lot of grinding...
2011-10-09
Fiasco - almost
Started the day with an idea for a jig, for latheing the brake drums without removing the bearings.
Spent most of the day making it and when I finally was going to late the brake drums i noticead that ther was a runout. Apparently the morse cone I made was not good. Fixed that and still it was not good. Came to the conclusion that the old bearings were crap.
Spent half an hour making the setup I should have started with. Hopefully the new brake surface is centered ...
Overcomplicated setup
Easy setup
Note (when removing bearings)
a) If the little voice in the back of your head says "don't do it this way" then don't.
b) Hitting yourself on the thumb with a hammer, that hurts.
Spent most of the day making it and when I finally was going to late the brake drums i noticead that ther was a runout. Apparently the morse cone I made was not good. Fixed that and still it was not good. Came to the conclusion that the old bearings were crap.
Spent half an hour making the setup I should have started with. Hopefully the new brake surface is centered ...
Overcomplicated setup
Easy setup
Note (when removing bearings)
a) If the little voice in the back of your head says "don't do it this way" then don't.
b) Hitting yourself on the thumb with a hammer, that hurts.
2011-10-02
Steering stem
Since I did not have any front fork for the CB125K5 frame I decided to go 'all in' and marry that frame with a CB125TD disk brake front fork.
The obvious was that the distance between yoke and bridge was different. The legs are also longer but that does not matter, I think...
The orther thing was that I did not have any bearings or bearing cups. The solution was to buy tapered roller bearing and lathe a couple of longer bearing cups.
Eventually I will, or not, weld them to the frame for additional strenght.
The obvious was that the distance between yoke and bridge was different. The legs are also longer but that does not matter, I think...
The orther thing was that I did not have any bearings or bearing cups. The solution was to buy tapered roller bearing and lathe a couple of longer bearing cups.
Eventually I will, or not, weld them to the frame for additional strenght.
2011-09-28
Cranks
Got 2pcs to work with, at the moment.
Guess which one is the better. I thought it was the right one but it's the one to the left.
The right one was much more rusty than the left when I started. After degreasing and brushing off the rust with a brass wire brush I detected wear in one of the crank pin bearings.
Maybe it's the same with the other one. Hope not. Probably will have to change crank pin and rods, preferrably to stronger rods with larger piston pins. Just have to find such rods first...
Crankshaft Service Data
Guess which one is the better. I thought it was the right one but it's the one to the left.
The right one was much more rusty than the left when I started. After degreasing and brushing off the rust with a brass wire brush I detected wear in one of the crank pin bearings.
Maybe it's the same with the other one. Hope not. Probably will have to change crank pin and rods, preferrably to stronger rods with larger piston pins. Just have to find such rods first...
Crankshaft Service Data
2011-09-18
Weight issue.
The easiest way to gain speed/acceleration would, of course, be to reduce the weight of the "pilot", but... Now I started to think about reducing weight from the crankshaft, that's a bit different.
The normal easy approach is to throw the rotor and stator in the trash bin and use a battery ignition. But how about using the alternator as a part of a magneto ignition? Can I then reduce the weight from the crank just by latheing away the same mass (as the rotor) from the crank counter weights? Would be the same thing or wouldn't it - or maybe that would be more, have to do some maths? Maybe not the high tech solution (or is it) - but about the same.
I think I have to get a pair of magneto coils and do some experimenting with the alternator in the lathe. Maybe I should have a back-up-plan and get a pit bike ignition instead and test it with dual coils (is there a dual output CDI coil)?
The normal easy approach is to throw the rotor and stator in the trash bin and use a battery ignition. But how about using the alternator as a part of a magneto ignition? Can I then reduce the weight from the crank just by latheing away the same mass (as the rotor) from the crank counter weights? Would be the same thing or wouldn't it - or maybe that would be more, have to do some maths? Maybe not the high tech solution (or is it) - but about the same.
I think I have to get a pair of magneto coils and do some experimenting with the alternator in the lathe. Maybe I should have a back-up-plan and get a pit bike ignition instead and test it with dual coils (is there a dual output CDI coil)?
2011-09-17
Blasting
Today was glass bead blasting day.
Among other things the hubs were blasted. It would be very easy to polish the hubs to mirror finish in the lathe.
But then I would have to polish the brake shields too and that sucks. Done that, once, and don't want to do it again.
Maybe I should aim for "No show but go"...
I also found out what the P in PMS stands for - Permanent !?
Among other things the hubs were blasted. It would be very easy to polish the hubs to mirror finish in the lathe.
But then I would have to polish the brake shields too and that sucks. Done that, once, and don't want to do it again.
Maybe I should aim for "No show but go"...
I also found out what the P in PMS stands for - Permanent !?
2011-09-02
New toys
Started another project, a cutter head for the CB125 valve seats, since my Neway cutters for the CB450 seats are way to large.
I'm a strong believer in DIY, but....
When the cutter heads was almost done I found out that I could buy cutter blades (on eBay) for cutting all three angles at the same time. Change of plans, opened the wallet ... Hopefully they will perform as good as they look.
I'm a strong believer in DIY, but....
When the cutter heads was almost done I found out that I could buy cutter blades (on eBay) for cutting all three angles at the same time. Change of plans, opened the wallet ... Hopefully they will perform as good as they look.
2011-08-24
Shop Manual
Hittade en halvdåligt skannad, ej modellspecifik K5 (gäller CB125 K0-K3) men innehåller nog relevant information.
Hittade redan i ett tidigt skede en Parts List, men sådana finns ju on-line på flera ställen på nätet.
Hittade redan i ett tidigt skede en Parts List, men sådana finns ju on-line på flera ställen på nätet.
2011-08-20
Obduktion
Började obducera den resevdelsmotor (endast underdel) jag fick med i lådorna.
Preliminär dödsorsak är att en kugge har lossnat från primärdrivningen och sökt sig in i växellådslagret. Hittills har jag inte hittat någon annan förklaring.
Preliminär dödsorsak är att en kugge har lossnat från primärdrivningen och sökt sig in i växellådslagret. Hittills har jag inte hittat någon annan förklaring.
Kadavret
Vet inte riktigt varför jag inte köper en renoverad och river den själv?
Här är den, "delvis" ...
Vid en första okulärbesikning av ramen ser det ut som om fram och bakhjul inte kommer att ligga lodrätt, samtidigt.
Eventuellt blir det till att värma och bända oxå. Är man riktigt noga så får man kapa-bända-svetsa.
Här är den, "delvis" ...
Vid en första okulärbesikning av ramen ser det ut som om fram och bakhjul inte kommer att ligga lodrätt, samtidigt.
Eventuellt blir det till att värma och bända oxå. Är man riktigt noga så får man kapa-bända-svetsa.
2011-08-18
I did it again!
Denna gång var det större lådor. En komplett (!?) CB125K3 i lådor + en delvis komplett motor (skrot kan man väl kalla det). Hoppas att delarna jag behöver, är användbara.
Smög in kadavret i förrådet när frugan var borta, förlitar mig på att det försvinner i mängden sas ;)
Smög in kadavret i förrådet när frugan var borta, förlitar mig på att det försvinner i mängden sas ;)
2011-07-07
Feltänk,
eller snarare inte tänkt alls. Vid provmontering upptäckte jag att den nya plattan var betydligt tunnare än orginal.
Min lösningen var att svarva en 0,9mm spacer av aluminium.
Resultatet
Min lösningen var att svarva en 0,9mm spacer av aluminium.
Resultatet
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