BSA Bantam D7 - FREE BIKE - Resto Thread

[93fxdl]

welcome to the weird and wonderful world of thread forms, british machinery would use different threads for different parts, most items would be bsf (british standard fine) electrical would use ba occasionally cycle parts would use bsc (british standard cycle) and if cast iron was involved then bsw (whitworth) would be called out to play, and another type would be bsp (british standard pipe) used for fuel fittings such as the tap.
metric nuts will "sort" of fit imperial studs/bolts but will seize as they do up, as the nut on your head stud appears to have done
before trying any more piston shifting i would suggest getting the down pipe off and squirting some atf mix up the port to get to the bottom of the piston skirt also give the top of the piston a clean to see if any sizes are marked on it so if you need to rebore you know your start point
ttfn glenn

[grizz]

Feb 4, 2011 20:09:54 GMT 93fxdl said:

welcome to the weird and wonderful world of thread forms, british machinery would use different threads for different parts, most items would be bsf (british standard fine) electrical would use ba occasionally cycle parts would use bsc (british standard cycle) and if cast iron was involved then bsw (whitworth) would be called out to play, and another type would be bsp (british standard pipe) used for fuel fittings such as the tap.
metric nuts will "sort" of fit imperial studs/bolts but will seize as they do up, as the nut on your head stud appears to have done
before trying any more piston shifting i would suggest getting the down pipe off and squirting some atf mix up the port to get to the bottom of the piston skirt also give the top of the piston a clean to see if any sizes are marked on it so if you need to rebore you know your start point
ttfn glenn

OOOPPSSSS...

I used a 2x2 and some significant force today..... moved the piston about 5mm

Left a puddle of atf on top of it.

Plug still not moving.

[93fxdl]

get some of your atf jollop into the inlet as with the piston being near the top, hopefully the inlet port will be open and allow the mix down into the crank and con rod
options for removing the plug
stick it in the oven or on top of a camping stove and get it good and hot before trying to undo
run some weld around plug to get heat into it
smash out the ceramic bit and drill out the remains
dont worry if it all goes pear shaped as a helicoil is an easy fix
as for the number of different thread forms just think yourself lucky you only have a few to deal with my harley has unf unc and npt that i know of and in the past have had dealings with acme, metric pipe, metric fine as well as a few oddballs like instrument threads and last night i found another i hadnt heard of modelmakers
ps if you ever play with an aga or rayburn they are whitworth
ttfn glenn

[grizz]

Feb 5, 2011 12:23:41 GMT 93fxdl said:

get some of your atf jollop into the inlet as with the piston being near the top, hopefully the inlet port will be open and allow the mix down into the crank and con rod
options for removing the plug
stick it in the oven or on top of a camping stove and get it good and hot before trying to undo
run some weld around plug to get heat into it
smash out the ceramic bit and drill out the remains
dont worry if it all goes pear shaped as a helicoil is an easy fix
as for the number of different thread forms just think yourself lucky you only have a few to deal with my harley has unf unc and npt that i know of and in the past have had dealings with acme, metric pipe, metric fine as well as a few oddballs like instrument threads and last night i found another i hadnt heard of modelmakers
ps if you ever play with an aga or rayburn they are whitworth
ttfn glenn

Thanks Glen,

Really wish you lived closer to the Deep South, so that I could buy you a coffee.

Report a bit later, today was spent doing all sorts of stuff.

[grizz]

OK, so I have been slacking a bit.

But then I did say I was going to try be patient.

Yesterday was Nicola's bithday, so after a cuppa tea in bed, some prezzies and a nice new helmet, we went over to Royal Tunbridge Wells for the day, shopping and being tourists.

Today I was going to paint the garage door frames that I did on Friday, their second coat, and also paint the outside of the garage, I am going from plain stark white to a softer Magnolia or cream colour, instead I ended up carting a load of wooden pallets and wood home fromt he neighbour 2 houses away, to chop up for the fire place, and also brought about 12 breeze blocks home for later use.

The other thing I did, and got caught on camera by Nicola for, was to hammer away at the stuck piston.....

Pics to follow.

I also took the exhaust off, and got the bike on its side to remove the rear brake pedal, and just started on the footpegs which have been WELDED onto the frame, when the neighbour came to ask if i wanted all the wood and bricks, which again distracted me.

Truely caught "Red Handed" by Nicola who heard the racket and came to inspect, camera at the ready.



This is how far I got with the strip down.
Piston down, and ports showing.
The barrel does not want to move from where it is, I also tried gently to remove the studs, failing there.




At this point I stopped with the bike and switched to "woodwork"

Hopefully I can figure out tomorrow what to do with the welded on, home made footpegs.

I suspect they will be staying there, as the damage may be irreversable.

[davytelford]

im glad your still persevering with it what you gonna do with the footpegs chop them off

[grizz]

Feb 7, 2011 22:25:44 GMT davytelford said:

im glad your still persevering with it what you gonna do with the footpegs chop them off

Hi Dave, Footpegs may get the chop.

I have a lovely new angle grinder (small size) that I bought in December to replace one that had given up on switching off (Yep, once started, it would not switch off, so I binned it as unsafe ) with a thin cutting blade, one should be able to remove most of what is welded in.
Although I need to figure out just how much needs to be left behind etc.

[twoblackcats]

Nice one grizz, you don't want to be rushing that anyways. Love the hammer pic, proper caught in the act. There's no water/fuel in the crank is there? Could be stopping it shifting and now the ports are open could be removed by up ending the bike. Just an idea like as we had a trail bike hydraulic lock the other day.

[davytelford]

any more progress on this one grizz

[93fxdl]

time for a few more bits of advice(?)
to remove studs screw on two of the correct nuts, then tighten them against each other (using af spanners if possible) then try to undo the stud using the spanner on the bottom nut.
a possibility for the stuck barrel may be "pinch" screws which squeeze the top of the crankcases around the bottom of the barrel
grizz think yourself lucky i am not living in the "deep south" as it would probably cost you LOTS of coffee but if you are really unlucky i may head down to essex to visit my nephew and watch him in the btcc
ttfn glenn

[grizz]

Feb 16, 2011 22:15:11 GMT 93fxdl said:

time for a few more bits of advice(?)
to remove studs screw on two of the correct nuts, then tighten them against each other (using af spanners if possible) then try to undo the stud using the spanner on the bottom nut.
a possibility for the stuck barrel may be "pinch" screws which squeeze the top of the crankcases around the bottom of the barrel
grizz think yourself lucky i am not living in the "deep south" as it would probably cost you LOTS of coffee but if you are really unlucky i may head down to essex to visit my nephew and watch him in the btcc
ttfn glenn

Hi Glen, coffee is a cheap rice for lessons and friendships mate.

If you want to pop into St Mary Hoo, send me a PM on Retro Rides, and I will give you more details.

WRT two nuts on a skewer.... I did do it before, but with only modderate force, so may try again some time.

[davytelford]

any more progress on this grizz

[deegee99]

Love the modded frame and footpegs so a kiddy can ride it, shame it has fooked the frame up though. Mind you they are pennies to get hold of, relatively speaking that is. Don't let that 7 bhp frighten you when you get it running again

[grizz]

Hi guys, no progress on the Bantam, as I now have a Scorpa SY250 and it is taking a lot of my time, along with some other stuff.

Today saw me going this direction.

Some of you know me and how my head works, so nothing in this thread should come as a surprise.

This will be a slower thread than many of my other builds etc..... as I am going do stuff differently.

Today we did a bootfair and I got lovely chimney pot for £15, not a bad price in my view, even though I would have loved a crown one, or something a bit different.

When we got home thought I would start by laying out the space.

I have 2.8meter by 1.8meter to play with, which will include a small decked area in front of the BBQ, joined up on the level of the lower step of the deck on the right of the pic.



Once I had set out the pins, my neighbour Mickey came around to check up on me , and the give advice.

He also offered me a 11foot by 12 inch strip of steel which is about 5/8th of an inch thick. It took the two of us to carry it to my place.
I cut two 1 meter sections off it, and also used some of the angle iron rescued from the frame of the trailer I used to build the Grizz-Pod to be butt welded 50mm on each side, this tray will form the floor of the BBQ under the chimney.





While I was at the cutting phase I thought it sensible to start making the oven I plan to build in as well.....

I drew up the lines and then cut all of them leaving about 2mm in each corner so that I could weld hinges and catches in place.



One of the items I picked up on a tip visit... a Ball Pein hammer was going to be the handle.



At this point, Mickey came around to "Help" me..... he donated the hinge, which I had planned on making from scratch.

Once all the welding is done, I will grind the lot down neatly, and paint the part that will be sticking out the brickwork with stove black enamel.



Hammer handle in position.



And glued on.




Mickey is a lot like me, loves a bargain, always looking for stuff to fix and runs his own transport company, so loads of house clearances and various other good jobs.
He is the guy who gave me the Makita chop saw last week as well.


Here he is posing like a proud father with the oven door in open position.

I still need to get some oven/cooker grill to cut to fit inside for the pans or meat dish to sit on when using the BBQ.
I also have to weld support sections to the sides, so that the whole lot can be bricked in, in suspended position, above the coals that will be pushed in underneath the oven from the BBQ side.



Once all the welding is done, including a retaining chain for the door, I will grind down and smooth all the edges, and fit the floor to the unit, I also need to make a lot of fire in the unit to burn away the potential taste of gas.




Next up the supports, then prepare the area where the foundations are going down, and build the timber frame and doors for the storage space below the concrete slab.

This is a mock up, out of scale, but just to get the perspective of what goes where.
I drew a pic over a photo, the cut it out, copied the pic with the blank in place, then drew in what I wanted.... does that make sense.

Oh, should have mentioned before, happy with any advice or tips on the whole build.

[93fxdl]

feel a bit cheated since the bantam is going on the back burner but needs must as for the burner plans i cant be much help since i am an engineer not a builder but one bit of advice i can give is bricks can explode if subject to extreme heat so be carefull
ttfn glenn